Air F H being rarified now requireth more space Now you will find the degrees of accretion and diminution of the heat and cold if that you divide the Line F A on the Table into certain parts of numbers Or without putting a Vessel under set the Glass L H even at the extremity L have a Globe with a little hole from the side and let this Globular Vessel be filled with Air for so also the degrees of heat will be shewed by the ascent and descent of the water Proposition X. The serene Air may be carried so by a most vehement fire that it may occupy a space 70 times greater than it did before On the contrary it may be so condensed in a Wind-gun that it may only possess a 60 part of the former space but the heat of the Sun bringeth not so great a rarification or the cold so great a condensation to the Air The same is proved from that that if you take an Aeolopile and heat it with fire so that it may then contain 13 ounces but the same being cold and returning to its former natural estate it will contain 13 ounces a dram and a half Therefore the space that the Air occupied whilst that it was hot is greater than the space that the Air possessed when refrigerated that the difference of the space is that part of the Aeolopile that receiveth half a dram of water if that the whole receiveth 13 ounces with half a dram and the part of this Aeolopile is almost the 70 part of the whole space in the Aeolopile therefore the Air being hot hath possessed a space 70 times greater than it doth when it returneth to its natural estate Proposition XI Why in the places in the Frigid Zone at the time in which the Sun ariseth not altogether unto them on some days the Air is clear and serene and for the most part cloudy and foggy Of the Air in places of the Frigid Zone I answer the cause of this gross and almost perpetual Mist or Fogg is the small heat of the subterraneous Earth it self or else it is derived from the Sun and likewise the Moon which in the time of the obscurity of the Sun remaineth many days and nights continually above the Horizon the other Stars which heat because it is weak cannot dissipate this Mist Now that some days or nights afford a serenity of the Air this happeneth not because the thick vapours are attenuated but because that they either sink down into the earth or else are forced into other places by the winds Proposition XII Why oftentimes in the greatest cold of the Winter the Air is yet subtile and serene when that yet the cold condensateth and contracteth the Air The Air subtile and serene in the greatest cold of the Winter Cold is twofold Moderate or Extream Moderate cold rendereth not the Air serene but cloudy by reason that vapours are elevated but not discussed by that little heat which is mixed or adjoyned to that cold But an extream cold maketh the Air serene for a twofold reason 1. Because it rendereth the grosser vapours of the Air more gross and so causeth them to fall and make the Air more subtile 2. Because that the pores of the earth are shut and bound up and the vapours themselves cannot exhale and render the Air turbid The Sea it self indeed is not bound up with Ice yet the particles are so condensated with Ice that it is not so apt for exhalations although it sendeth forth many for the condition of it and the earth are different Proposition XIII Why the Air being beheld at the Horizontal Line appeareth more thick and cloudy than that in which we are The cause is twofold 1. Because that the Air about the Horizon is indeed more cloudy The other is a fallacy or deception of the sight or judgment from our sight for the eye apprehendeth the distances of columns placed in a long order and series and therefore as the judgment supposeth the remote columns to be conjoyned so also it apprehendeth not the distances of the particles of the Horizontal Air but imagineth them conjoyned but the eye beholdeth the distances of the elevated Air under greater Angles and therefore better apprehendeth it The same is the reason why the Air which appeareth cloudy to us removed from it when we come to it or are in it seemeth less misty or cloudy Proposition XIV Whether that the Altitude of the Atmosphere or Air above the Earth be the same in all places at one and the same time and whether its figure be spherical Of the Altitude of the Atmosphere That the Altitude is not the same but divers in sundry places seemeth to follow from thence that the Sun is only Vertical to one place at one time and it sendeth forth oblique rayes and therefore more weak unto other places by how much the place is more remote from the Sun and nearer to the Poles therefore the pores of the rayes of the Sun are very different to the elevating of the vapours and therefore they are raised to different Altitudes to wit in a place unto which the Sun is vertical his Altitude is the greatest in the opposite place the lesser in the places about the Pole moderate so that the Air receiveth an oval figure But the contrary is more probable viz. that the Altitude of the Atmosphere is the same in all places for although that the Vapours and Air be more elevated in some places than in others yet because that the Air is fluid and tendeth by its gravity to the Center of the earth therefore the more elevated part of the Air presseth down the Air placed under it and this thrusteth down another more depressed until all the parts acquire the same Altitude And after the same mode the Spherical Figure of the Air shall be demonstrated as in the thirteenth Chapter we have proved with Archimedes concerning the water by reason that the same Hypotheses are prevalent here which we there assumed to wit that the part of the Air less pressed is expelled by that which is more pressed for every part is pressed by the Air that is above it wherefore the Figure of the Air is spherical not oval as some will have it but if the forementioned Hypotheses be not granted the demonstration falleth Des Cartes also maketh the Air oval in figure for a peculiar reason see Chapter fourteen Proposition XV. Condensation or Rarefaction of Air changeth not its Altitude Condensation of Air changeth not its Altitude Because that the whole Atmosphere is not condensed but only some parts and at all times some parts are condensed sometimes these sometimes those wherefore the condensation or rarefaction of one time doth no more alterare the Air than the condensation or rarefaction of the first time There only seemeth to be a difference that at one time there may be a greater condensation or rarefaction than at another but this
calculation and make a trial of the matter whether that the Altitude be the same every where and at every time I will give them here Examples from the Observations of Tycho who hath observed the refractions of the Sun and Moon at every degree of their Altitude And because that the Observations of Lansbergius because that he observed them in a different Air if that he observed them at all differ from those of Tycho's I will also add them The TABLE of Refractions The degrees of Altitude The Refraction of the Sun according to Tycho The Refraction of the Moon according to Tycho The Refraction of the Sun and Moon according to Lansbergius Degrees Minute 1. Minute 1. Minute 1. 1. 0 34 33 34  1 26 25 26  2 20 20 21  3 17 17 18  4 15 15 15 45 5 14 14 14 0 6 13 14 12 30 7 12 13 11 15 8 11 12 10 5 9 10 11 9 5 10 10 11 8 15 11 9 10 7 35 12 9 10 7 5 13 8 9 6 40 14 8 8 6 19 15 7 8 6 0 16 7 7 5 42 17 6 7 5 24 18 6 6 5 7 19 5 6 4 50 20 4 5 4 33 21 4 4 4 16 22 3 3 4 0 23 3 3 3 44 24 3 3 3 28 25 2 2 3 12 26 2 2 2 56 27 2 2 2 40 28 2 2 2 24 29 2 2 2 9 30 1 1 1 54 31 1 1 1 39 32 1 1 1 24 33 1 1 1 9 34 1 1 0 55 35 1 1 0 41 36 1 1 0 27 37 0 1 0 13 38 0 1 0 0 The refractions of the Sun and Moon according to Lansbergius and Tycho Lansbergius placeth both the same refractions of the Sun and Moon but Tycho maketh them somewhat divers viz. about the Horizon he maketh the refractions of the Sun greater than those of the Moon then the fifth degree of Altitude he maketh them equal from this then at length he maketh the refractions of the Moon a little bigger than those of the Sun Indeed I confess my self ignorant of the cause of this except it be to be ascribed to the weakness of the light of the Moon Moreover Tycho omitted the second Minutes which yet should not be omitted if that they come near to 60 because that there is use of them in the calculation of the altitude of the Air. Now you must know that the refractions of all the Stars are the same or else that the difference is insensible viz. in one Air But if that the Air be thick the refractions will be greater An Example of it is this whereof a cause hath not yet been rendred sufficiently hitherto by any The Dutch Wintering in Nova Zembla beheld the Sun after the night of some Months when that as yet the Limbus or edge of the Sun was yet beneath the Horizon four degrees at least therefore the refraction n f L is 4 deg 30 min. Then at length when that it was depressed beneath the Horizon 3 degrees 40 minutes they saw him elevated above the Horizon 30 degrees viz. his upper Limbus therefore the refraction m r L we conceive m r S to fall beneath the Horizon and r L g to be 30 min. shall be 4 deg 11 min. and L L T 90 deg 30 min. From hence shall be found the altitude of the Air L f and the reason of the density of that Air at Nova Zembla which yet was serene at the time of the Observation Now the Altitude is found much greater than the other refractions admit of viz. of almost two miles neither is it corrected by the position of a greater thickness of Air as shall be shewed in the following Proposition by reason that the Angle T f L cannot be greater than 85 deg 30 min. if that n f L is 4 deg 30 min. it becometh greater if that d f be placed less than 2 miles Therefore we do not undeservedly doubt of the truth of the observation of the Mariners seeing that no like Example hath been observed yea the contrary hath been observed in the same place See Chap. 26. Proposit uit Moreover no reason can be rendred that in those places after so long an absence of the Sun the Air should be higher than at the time wherein after so long a stay the Sun departed seeing that rather the contrary doth follow viz. the Air becoming more thick and lower by reason of contraction if that any one will urge the altitude of the Air to be inconstant Yet when I more accurately weigh all the matters three things fall in with me by which that apparancy and great refraction may be salved for seeing that the Master or Pilot was skilful in Astronomy and also that they saw the Sun elevated above the Horizon in which he was yet depressed therefore we ought not to deny the Observation neither ought we to be suspicious concerning an Errour in the numeration of the days by reason of that long night for when that they returned to their own Countrey they reckoned the same day of the year that their Country-men reckoned which they could not have done if that before they had made a false reckoning of the days For if that we will admit so great an altitude of the Air such as the refractions of the temperate and torrid Zones do not admit of we must say that the Air is every where the same both in the torrid and temperate Zone as it is in the frigid but the supream Region of the Air both in the torrid and temperate Zone is so subtile that it maketh no refraction but only the middle Region Whence it is no wonder if that the refractions in the torrid and temperate Zone be lesser for although the Air be lower that causeth them for which cause the refraction ought to be greater yet it s far more rare than the other Air. But yet an Objection may be made against this viz. that the observation of the Mariners was made in a serene Air as they themselves testifie Unto this I answer That yet it seemeth not so probable that the Air should be so subtile as in the torrid and temperate Zone when that the Sky is most serene Secondly it may be said That that Air of the frigid Zone when that the Sun after a long absence returneth unto it is first attenuated in the superior Region and the middle is yet somewhat more thick and therefore the Sun was seen through two refractions as the Stars through the Air and a Glass Now a double refraction doth far more depress the Star beneath the Horizon than a simple and so the altitude of the Air the space of one mile or ¾ Neither may you here object why the same doth not happen at that time when that the Sun departeth from the Air and maketh the beginning of the â—ong Night For then it is probable that there is less difference in the thickness of the Air by reason of the long
Horizon but oblique Yet it is not general that the wind proceedeth in a perpendicular way to the Horizon because that oftentimes in the Air transverse Blasts are found So we see that Smoak coming forth of a Chimney is not carried by the wind towards one quarter but part of it is carried unto other quarters Proposition XII Why the Winds blow by an interrupted force so that sometimes they cease and other some as it were with redoubled strength they return with the greater importunity And why that they seem more continually to blow on the Sea so that it is discovered less calm The Winds 〈◊〉 blow by an interrupted force I suppose the reason to be that the cause that moveth or stirreth up the Winds continueth not always but that some space is required unto the collection of such a quantity which by such a vehemency may break through the Air and therefore because that Exhalations are more continual in the Air and the motion is less impeded there the calm in the Ocean is less discovered although that it be not wholly removed Proposition XIII Why no Wind bloweth perpendicularly from the Air unto the places of the Earth Concerning this question See Aristotle lib. 2. chap. 9. of Meteors Aristotle in his Second Book Chap. 9. of Meteors treateth very absurdly so that the Peripateticks are not agreeing concerning his Opinion neither shall I in this place relate their Sentiments The cause seemeth easily to be explained viz. that the Air being thrust downwards towards the Center of the Earth cannot break through this way by reason that other vapours are expelled or born upwards and therefore the overmuch resistance of the Air which is directly scituated under the Air moved causeth the protrusion to be made to the sides of the place in which the violence beginneth Which is therefore the more probable seeing that the matter of the Wind is for the most part more light than that Air and that is more rarified than that which is more near unto the Earth Proposition XIV Why Westerly-winds are less frequent than Easterly-winds See Proposition 10. The cause of this is manifest from the Tenth Proposition where we have made the Sun to be the first cause of Winds who so rarifieth the Air proceeding from the East to the West and therefore the Air is more thrust towards the West Therefore that this general cause may be impeded of necessity very many Exhalations must consist in the Western quarters which doth happen less frequently Proposition XV. Why the Northern and Eastern-winds are more impetuous and stormy and on the contrary the Southern and Western more relaxed and weak The Northern and Eastern Winds more stormy than the Southern and VVestern The cause is by reason that the Northern Air is more thick by reason of Cold and the Southern in our Zone by reason of the greater dissipation caused by the Sun and Heat is more rarified Now by how much the Air is more rarified by so much the lesser is it carried with an impetuous force Yet you must know that the South-winds are cold dry and violent in the Temperate Zone or the Artick Zone opposed to ours no less than the Northern-winds are unto us but the Eastern-wind is more rigid or more intense for another cause viz. because that it ariseth for the most part from the refraction of the Air made by the Sun which being continually carried from the East to the West the Air also is thrust forwards with the greater violence from the East to the West But it is probable that other causes may accede that may either help or obstruct that violence Proposition XVI Why the Southernly and Westernly-winds are found more hot than the Easternly and Northernly which have a wonderful power of causing Cold in respect of them The Southern and VVestern Winds are found more hot than the Easternly and VVesternly So this Question is wont vulgarly to be propounded yet we must know that in must not generally be understood of all places but only concerning the places of our Zone For in the other temperate Zone scituated towards the South from the Aequator the contrary holdeth true because that in these places the Northern-winds are hot or warm and the Southern are found more cold And so the nature of the thing and the condition of the cause required For the reason why the South-wind is discovered more warm to us and the North more cold proceedeth hence viz. that the South-winds come from a quarter and places more near unto the torrid Zone or way of the Sun but the Northern places more remote from that way of the Sun that is from more cold places But the contrary is found in places scituated towards the Antartick Pole from the Aequator because that the Northern-winds approach to them from the way of the Sun the Southern from the places more near the Pole But as concerning the Eastern and Western-winds I must answer otherwise neither doth that diversity of the places of our Zone and that of the opposite here take place Therefore first it is said in the preceding Proposition that the Western-winds are less frequent in all places the cause of which is the same with that by reason of which the Occidental winds are discovered more warm viz. because that for the most part they blow in the Night and after the setting of the Sun where the Air that is thrust forwards towards our place is more calid or less frigid than the Air of our place which is more remote from the West than that which lieth between the Sun and our place There is also another cause which also is of force in the difference between the Northern and Southern-winds viz. that the Western-winds blow with less violence and not so intense but with some relaxation Now it is known that any Air or Wind is discovered so much the more cold by how much it bloweth with the greater or more intense force although in truth it be no hotter or colder which is evident by our expiration which we can exhale either cold or hot Proposition XVII Why Mariners from the sight of a Cloud especially such a one that is of a pale or duskish colour predict a wind from that quarter also to declare the other signs of future winds Mariners from the sight of a Cloud predict a Wind from that quarter A twofold Reason may be rendred for either Clouds of that colour do shew that by and by they shall be dissipated and dissolved into Blasts or else the Clouds sinking by their own weight and segregated from other Clouds press down the Air beneath them and so cause it to blow Concerning the peculiar Clouds termed by the Dutch the Bulls-eye see the following Chapter 1. The Sun appearing spotted in his rising and lying obscured under a pale or black Cloud foretelleth either showers or winds 2. If that the Sun at his rising appeareth concave so that it shineth
from the middle and sendeth forth rays it signifieth a moist and windy season 3. If that the Sun be pale in his setting but if it be red the Air will be quiet and serene the next day 4. If the Sun being pale setteth in black Clouds it signifieth a North-wind 5. If that the Moon be red like unto gold it is deemed a certain sign of a Wind according to the Verse Pallida Luna pluit rubicunda fiat alba serenat 6. A circle about the Moon 7. If that the Northern-horn or corner of the Moon appear more extended a North-wind is approaching 8. If that the Southern a South-wind is at hand 9. The rising of the Moon and the more noted Stars as of the Bear Orion and especially the Goats with the Sun 10. If the small Stars in Cancer termed Asellos be covered with a Cloud if the Northern of them be covered the Wind will be South if the Southern be covered it will be North. 11. For the most part Winds begin to blow when that the Wind ceaseth 12. When a certain noise and murmur like to an Ebullition is heard in the Sea 13. The Ancients also prognosticated from the Raven the Dolphin and other Animals 14. From fiery Meteors as from Lightning and Falling-Stars but not from the Ignes fatui Proposition XVIII Why in the Spring and Autumn the Winds are more frequent and blow with greater force than in the hot Summer or cold Winter Greater and more frequent Winds in Spring and Autumn than in Summer and cold VVinter In the Spring it is supposed to be partly by reason of the dissolving of Snow especially in Mountainous places partly because that the Pores of the Earth are then opened and send forth many exhalations partly because that the Air and Vapours are then more thin when that they were condensed in the Winter Add that for the most part in the Month before the beginning of the Spring and in the very Spring many Rays do fall by reason that humid Constellations then have possessed those houses of the Zodiack into which on the entrance of the Sun we account the beginning of the Spring and also in Autumn the frequent Rays and Exhalations are to be accounted the cause of the Winds as well as in the Spring by reason that a moderate heat proceeding from the Sun advanceth the Vapours and Exhalations yet such as are more thick and less attenuated But in the heat of Summer there are no Winds for the most part for the same reason by reason of which Rays are very seldom seen at that Season viz. because that the Sun overmuch attenuateth the Exhalations and doth not permit them so to conjoyn or meet in such a quantity as is required to the generation of the Winds Which cause is not general or always true and neither is it generally true that in the heat of Summer there are no Winds for here we are only to understand it concerning that which oftentimes happeneth But in the sharp Winter the winds are more rare and that by reason that both fewer Vapours are raised from the Earth and those also that are elevated are either condensed into Clouds or are so dissipated by Frost that they cause no wind Proposition XIX In what Altitude of the Air or in what Region of the Air the Winds begin to blow In what Region the Winds begin to blow There are some that suppose the winds not to exceed the lower Region of the Air because that they discover that the tops of the high Mountains as Olympus feel no Blasts But I question the Observation seeing that the Smoak cast forth from the top of Mount Aetna is discerned to be moved to and fro by the wind therefore I suppose that such a windy commotion may be caused also in the upper Region of the Air. Proposition XX. Vnto what space one and the same Wind may extend it self How far one and the same Wind may extend it self There is great diversity in this matter for the winds blowing from the East to the West under the torrid Zone seem to encompass the whole Earth and those also that blow either from the North or South for many days and long spaces are wont to accompany and follow Mariners The same seemeth true concerning collateral Lines but this diversity is because that the same wind is different in divers places as we have shewed in the Tenth Proposition in the end of the explication of the first cause CHAP. XXI Of the Winds in particular and Tempests IN the foregoing Chapter we have alledged the distribution and differences or rather the denominations of the Winds which they receive from the quarter from whence they blow or seem to blow which division also is accidental by reason that they are taken in respect of a certain place of the Earth unto which those Quarters are related Now in this Chapter we shall alledge the divisions and Phaenomena which are in a certain time of the year or else are proper to certain tracts of the Earth although that we desire to have more and those likewise more accurate Observations concerning these things But we will produce what we have collected with much labour from the Diaries of the Seamen Proposition I. One Wind is constant and another inconstant Of Winds constant and inconstant That is a constant wind which at the least for one or two hours bloweth from the same quarter That is an inconstant wind which sometimes bloweth and other some is changed into other winds blowing from other quarters The causes of the more or less duration of the same wind also of the swift immutation seemeth to be 1. if that it be from a general cause or from a cause less constant So Winds proceeding from the motion of the Air with the motion of the Sun in the torrid Zone are constant so those also that blow from the dissolving of the Snow especially in the Mountains 2. If that by chance there be no such vapours in other quarters which are apt to generate Winds 3. If that the circumambient Air about the Cloud of which the Winds are generated be more thick and granteth no passage to the Exhalations but if that the Air be not so thick or more relaxed and that few Vapours be here and there in divers places and quarters and lastly if that the general causes do cease then indeed the Winds are found variable which are for the most part gentle Proposition II. One Wind is general and another particular Of general and particular Winds The general Wind is termed by Mâ—riners a Passant wind which at many places at once in a long tract of Earth bloweth on the Sea almost for a whole year That is termed a particular on the contrary which bloweth not at once in many places for a whole year Now a general Wind is hindred 1. In the parts of the Sea near the Earth for here Vapours from other quarters do interpose
all places almost in the Parallels of the 10 deg even unto the 30 deg North. After the same manner beyond the Tropick of Capricorn in the Sea between the Promontory of Good-hope and Brazile the South-East wind bloweth even unto the 30 deg of Latitude that is 7 degrees beyond the Torrid Zone towards the South and that through the whole year And although as we have said that this general wind is not discovered on all Coasts much less in Mediterranean places yet in some it is sufficiently observable So on the Coasts of Brazile Easterly unto the Coasts of Loango the South-East is a Quotidian wind although that other winds do admin themselves There is a threefold Cause of this continual general wind alledged by Modern Philosophers for both it and the Torrid Zone were unknown to the Antients who have not so much as mentioned it Some Determine that the Sun is the cause of this wind blowing from the East to the West by reason that by its great faculty it rarifyeth the Air in the Torrid Zone and so it thrusteth it forwards from the East to the West seeing that the Sun it self goeth this way Some and those of the Opinion of Pythagoras that Determined the Heaven to stand still and the Earth to moved round some of them I say supposed this general wind to Proceed from hence viz. that whilst the Earth is moved round and the Air with it this less followeth the motion of the Earth but is somewhat more slower to motion and therefore whilst that we are carried with the Earth from the West to the East the Air moved with less celerity to the same quarter seemeth to meet us and to be moved from the East to the West when that yet we do rather meet it See Des Cartes in his 222 Proposition of his Principels Des Cartes alledgeth the third Cause and that altogether new in the 222 Proposition in his Principles Where he endeavoureth to shew that the Moon causeth this motion as well as the motion of the Sea from the East to the West But because that his Opinion cannot be understood except that all his Philosophical Hypotheses should be Explained therefore we shall say nothing concerning it here especially seeing that we shall shew in another place that that Cause is not true I approve of the first Cause the second seemeth therefore not to be received because that many Copernicans approve not of it and no reason can be given why this wind should be found to blow only between the Tropicks or to the 30 deg of Latitude and not in the whole temperate Zone Proposition III. Some Winds are Periodical and fixed others wandering and Erratick Some winds fixed others wandering Those are termed fixed and periodical which blow on certain daies and then cease for a certain number of daies until that they begin to blow again Some return in the space of half a year othersome are Monthly which return in the interval of one or two Months Also the fixed winds are otherwise subdivided viz. some when that they begin to blow continue for some Months others for half a year others for a Month others for a few daies Amongst these those are chiefly observed by Mariners which blow for some Months in certain places of the Sea and they call these winds as also the times wherein such winds blow Motions or Moussons And such Motions are more especially notable in the Indian Ocean from Africa to the Philippine Isles although that they be not wanting in other places there is a very great moment to be placed in the observation of these Motions for Seamen ought to choose the time of them for the Voyage that they intend to that same quarter or that which is collateral unto which that wind bloweth neither to undertake a Voyage to the quarter of this Motion but to expect the contrary Motion For in the parts of the Indian Ocean where that one wind ceaseth to blow for some Months another succeedeth contrary to the former and continueth with the same constancy until that it hath compleated its time and therefore they call these Contrary Motions They term those the time of the mutation of those Motions which intercede between the end of one Mousson and the begining of the contrary For one Motion ceasing another doth not presently begin to blow but some days fall between some times more sometimes fewer also more in some places and fewer in other some And in these intermedial daies in which no certain Motion bloweth the wind is variable the calm dangerous and for the most part the Sea is tossed with uncertain waves and sudden Tempests arise some of these Motions return twice in a year but not with the same vehemency whence Mariners term the one the great Motion the other the lesser 1. In that part of the Atlantick Ocean that lyeth in the Torrid Zone as also that which is in the Temperate Zone the North wind perpetually bloweth in the Months of October Months most fit to taka a Voyage from Europe to India November and January And therefore these Months are chiefly fit to undertake a Voyage in from Europe to India that they may pass the Aequator by the help of those winds For it is manifest by experience that some Ships that have set Sail from Europe in March have arrived no sooner at Brazile than those that have set Sail in October viz. both of them have come thither in the Month of February being helped by the North wind Yet because that this wind is not so continual and certain therefore Mariners are not wont to call it a Motion Neither is it an easie matter to render a cause of this wind in these Months unless you will refer it to copious thick vapours or to a continnual pressure made from thick Clouds But those that have wintered in Nova Zembla testifie that there is a most frequent North wind all the time of the Winter where this effect cannot be ascribed unto the Sun rarifying the Air seeing that he lyeth obscured under the Horizon Yet I suppose that in general the Cause may proceed from the dissolving of Snows or gross Vapours or Clouds collected in the Winter in the Northern and Southern places especially on the Mountains Which I am induced to believe by this Argument more especially because that these Motions blow for the most part from the North and South quarters or the Collateral unto them Therefore by reason that Snow and thick Clouds are dissolved in the Northern places by the Sun especially in that half of the year in which he passeth through the North part of the Ecliptick therefore those Motions shall then be Northernly After the same manner in the Southern or Antartick places for the other half of the year the Sun dissolveth the Snow and the thicker Clouds therefore then the Motion shall be discovered Southerly Now that these Motions blow more from the Sea in the Collateral quarters
great concernment yet it is better to begin from the Aequator that all the places may lie in some Climate Proposition XV. To shew the use of the Table of the Climates 1. The Latitude of some place or Elevation of the Pole being given to know the quantity of the Longest day in that place and the Climate in which it lieth Let the given Elevation of the Pole be sought in the Table and on the opposite Region we shall find both the quantity of the Longest day as also the Climate and the Parallel If that the given Elevation cannot be found in the Table then take that Elevation which is less near or the like which is found in the Table From the Longitude of the Longest day of any place to know the Latude of the place and the Parallel and Climate 2. The Longitude of the Longest day of any place being given which any person hath observed or received by relation to know from thence the Latitude of that place the Parallel and the Climate in which that place lieth Enter the Table with the Latitude given and you shall see on the opposite Region both the Latitude and the Place demanded as also the Climate and Parallel 3. A Climate being given to determine the Longitude of the Longest day and the Elevation of the Pole This is facil from the very sight of the Table CHAP. XXVI Of the Light Heat Cold Rains in the diverse parts of the Earth or Zones and other properties of the Zones Proposition I. These Causes are efficacious to generate and procure Light Heat Cold and Rain with other Meteors in the places of the Earth and the vicine Air. Of the causes of Heat 1. THe more or less or no obliquity of the Rays of the Sun coming to or emitted on any place For the Rays falling perpendicular on any place cause great heat and the other Rays sliding obliquely have for that very reason a less power of heating by how much the obliquity of them is the greater that is by how much the more they decline from the perpendicular Ray. 2. The diurnal stay of the Sun above the Horizon of the place For the same heat maketh more hot and changeth the Air in a longer time than in a shorter 3. The depression of the Sun beneath the Horizon being more or less in the Night season For this difference of depression causeth that either more or less Light is perceived in the Air also more or less Heat Rain thick Clouds Hitherto belongeth the Twilight 4. The more or less Elevation of the Moon above the Horizon the more or less depression of the same beneath the Horizon the more or less Diurnal stay of the same above the Horizon The Causes are the same with those alledged in the three foregoing Paragraphs The Planets and fixed Stars raise Vapours c. in the Air. 5. The same may be said of fixed Stars especially of those more noted ones and of the five other Planets Saturn Jupiter Mars Venus and Mercury For they generate some light and heat in the Air although it be but little and change the Air divers ways and raise Vapours if that we may credit Astronomers 6. The propriety or species of the Earth of every place For where the Earth is more stony and rocky there for the most part it is more Cold than where it is sulphureous and fat and here again it is more fertilâ— Where there is much Sand and no Rivers there is greater Heat Fumes and Mists proceed from Lakes 7. Lakes or the Sea adjacent From thence also Fumes and Mists are raised more moist and frequent in the Air and the Rays are less powerfully reflected from the Sea than from the Earth 8. The scituation of Places For the Sun acteth otherwise on Mountains and Mountainous places than on Valleys and Plains Moreover Mountains hinder the free access of the Rays of the Sun to the subject places for to them the Vapours of the Air are in some sort attracted See Chap. 20. whence the Mountains change the seasons of the adjacent places as Heat Rain and the like For these would be otherwise in the Subject places if that the Mountains were absent The Winds cause difference in the weather 9. The Winds especially the general So the Etesian winds temperate and allay the Canicular heat A general Wind in the Torrid Zone especially the Subsolan winds in Brasilia render the Heat temperate when in Africa which is Occidental the Heat is vehement because these places feel not so general a Wind. The Northern winds are cold and dry the Southern warm and moist in our places 10. Clouds Rain and Fogs take away and diminish light and heat I suppose that there are not many causes of this variety in light and heat c. which is observed in divers places of the Earth or also in the same places but yet in a different time or season Proposition II. How are the Seasons of the year Spring Summer Autumn and Winter to be defined The four Seasons of the Year Although in Sciences we ought not to contend and dispute concerning Definitions yet because certain Homonymes or Likenesses do here occur without the Explication of which there will arise much confusion in the following Doctrine therefore I will so propose this Question that you may the more cautiously avoid this Homonyme that they may not be deceived and intangled by the same The Question comprehendeth two difficulties first Whether these Seasons ought to be defined from the entrance of the Sun and his stay in certain sings of the Ecliptick and Zodiack According to Astronomers and Astrologers For so Astronomers and Astrologers commonly do saying that that is the Spring whilst the Sun moveth from the first degree of Aries to the first of Cancer that is Summer whilst the Sun moveth from the first of Cancer to the first of Libra that is Autumn whilst the Sun moveth from the first of Libra to the first of Capricorn and that is Winter whilst the Sun moveth from the first of Capricorn to the first degree of Aries Now it is manifest that these Definitions are not general and agreeable to all places because they are only of force in the Northern places scituated from the Aequator towards the Pole Artick and not in the Southern so that for these Definitions the same persons bring Definitions contrary to the former saying that in these places the Spring beginneth from the first degree of Libra proceeding unto the first of Capricorn the Summer from the first of Capricorn to the first of Aries the Autumn from the first of Aries to the first of Cancer and the Winter from the first of Cancer to the first of Libra But from thence it would follow that those Seasons cannot possibly be defined which is false and Generals ought to be defined by Generals Secondly Definitions so made cannot have place in the places of the Torrid Zone
distance from the place assumed the Spring when he goeth from a point of moderate distance towards the very Vertex of the Pole or to the point of the Ecliptick which is Vertical to the place or to the Parallel of the place the Summer where the Sun goeth from this other point of middle distance to a point of greatest distance that is the first degree of Capricorn or Cancer 2. In the places of the Aequator it self the Sun no day of the year remaineth above the Horizon more or less hours than twelve and so many beneath the Horizon In other places of the Torrid Zone one hour or an hour and an half at the most viz. in the extream places of this Zone about the Tropicks of Cancer and Capricorn when the day is at the longest the Sun remaineth above the Horizon twelve hours and in the shortest day about eleven hours and in the intermedial days that time of the stay of the Sum above and beneath the Horizon doth not much differ from twelve hours And therefore this is the cause that the nights are not without cold and the heat of the day continueth not long about the eveningtide 3. In the night time the Sun is profoundly depressed beneath the Horizon for that he illustrateth the Air with none of his rayes nay not reflex This is the cause that most dark nights are there and the cold of the night is augmented the Air is condensed and contracteth it self and being cold it descends towards the earth by its own ponderosity Moreover in a very short time about the space of half an hour before the rising of the Sun and after his setting those places have the light and heat of the Twilight 4 The Moon almost after the same manner as the Sun ascends directly from the Horizon towards the Meridian of those places yet a little more obliquely because it departeth from the Ecliptick and therefore towards the Torrid Zone about five degrees and it remaineth after the same manner as the Sun a little above twelve hours above the Horizon and is depressed beneath it almost so many hours and that profoundly as we have spoken of the Sun Therefore with her direct rayes or those near to the perpendicular she will augment the warmness of the night especially when she is Vertical to any place and diminish it by her recess but by reason of her short stay above the Horizon the effect of it is little discerned in any place except when it is Vertical to it 5. All the Stars arise and set in places nigh the Aequator but those Stars which are near the Pole in places more remote from the Aequator do not arise and those are but very few and therefore they can cause little heat and light and that also insensible in the Air. 6. In many places of the Torrid Zone as in India and its Isles in the Tongue of Africa and in Mexico the earth is Sulphureous which sendeth forth more calid vapours whence it communicateth a certain heat to the Air and a peculiar property In some places it is sandy as in the North part of Africa lying in the Torrid Zone in part of Lybia and the Land of the Negroes in many places of Arabia in Peru and in the places between Peru and Brazilia whence in these places a very great heat is raised by the Sun because the particles of the Sand do very long retain the heat received from the Sun and soon communicate the same to the vicine Air. In other places the Rivers are many and in those Sandy ones few there are many in Abyssine in Guiney Congo India and in Brazilia hence humid vapours are raised which do very much blunt the force of the Suns rayes and render his heat more tolerable 7. The most places of the Torrid Zone have the Sea adjacent as India and its Isles the Tongue of Africa Guiney Brazilia Peru Mexico some places of the Torrid Zone are Mediterranean as the more inward Africa the Regions between Peru and Brazilia whence it cometh to pass that in those places the heat and drought is greater and in some or most of them the Air is more moist and less fervent then can be caused by the Sun except other causes happen 8. Most of the Regions of the Torrid Zone seeing that they are almost encompassed by the Sea have in the middle places more or lesser ridges of exceeding high Mountains as India and its Isles the Tongue of Africa and Peru These rows of Mountains do very much vary the light heat and rayes of those places somewhere they hinder the Oriental rayes of the Sun otherwhere the Occidental Moreover the humid vapours condensed in the Air are moved to the Vertices of these Mountains as we have shewed in the twentieth Chapter whence rains and clouds proceed by which the heat and light of the Sun is very much obstructed and the Celestial cause of the Seasons is disturbed There are few of the places of the Torrid Zone which want those ridges as the inward Africa Mexico and the like 9. The effects of the Winds in the Torrid Zone are various and notable for a general wind blowing from the side Plagas of the East or from the East continually towards the West refrigerateth the Maritim places which regard the East as Brazilia the Oriental Coast of Africa but not so to those towards the West as Guiney Congo Angola and the Coasts of Peru. Some winds are appropriated as the South in Peru which winds dispel vapours towards the Plaga in which they blow Some are fixed winds of which we have largely treated in the one and twentieth Chapter Now these winds do very much disturb the Celestial cause of the Seasons for they are almost as equally constant and observe order as the motions of the Heaven it self They bring down the Air compel the vapours towards the tops of the Mountains and by other Modes alter the Seasons Ten Anniversary rains are in many places of the Torrid Zone and take away the Celestial cause seeing that they are as equally constant as the motion of the Sun it self For those err who suppose that this our Sublunary Orb observeth all with inconstancy and without order and that the Celestial only have a constant motion Seeing that the causes hitherto spoken of are so various to be able to cause the heat and the properties of the Seasons and in one place some are from other causes in another others are of force or concur in divers Seasons of the year or mutually impede one another hence we discover why the cause and condition of the Seasons of the Torrid Zone is so various Proposition XI How the Spring Summer Autumn and Winter Terrestrial do behave themselves and in what Months of the year they commence in the divers places of the Torrid Zone Of the beginning of the Seasons in places in the Torrid Zone We have said before and especially in the second Proposition that
the Seasons in many places of the Torrid Zone are contrary to the motion of the Sun viz. that it is Summer there when the Sun is most distant and Winter when he is nearest yea vertical to the Vertex Therefore we have distinguished the Seasons into Celestial and Terrestrial We have shewed heretofore and that in the third and fourth Proposition how any place being given in that Torrid Zone the Months of the year are to be found in which the place ought to have Summer Spring Autumn and Winter if we have regard to the access and recess of the Sun that is we have taught to design the times of the Celestial Seasons But seeing that in many places of this Zone the forementioned Seasons do not happen in those Months but in others and that in divers places in a different time therefore the times of the Terrestrial seasons must be taken not from the Heaven or a certain method but from the experience made in those places and as much as possible the cause of every one of them why they repugn the Celestial cause must be explicated viz. from those 10 causes which we have laid down in the first Proposition 〈◊〉 this therefore ought first to be known that the Winter in the Torrid Zone doth rage with cold and frost but rather with raines and is to be defined by a lesser heat then that in the time of the Summer Farther in many places of the Torrid Zone they reckon not four but two seasons of the year viz. Summer and Winter and these are not distinguished by heat and cold but chiefly by siccity and humidiy for in the Winter they have often greater heat than in their Summer with a shortness of respiration because the rain and the Clouds press the Calid Air downwards But the Spring and Autumn are not to be found by so manifest signs or differences We shall begin our Narration from that part of Africa which lyeth under the Torrid Zone and proceeding towards the East with Brazilia we shall finish the whole Torrid Zone seated in the West measured by us The Regions of the Occidental shore of Africa from the Tropick of Cancer to Cape verd that is distant 14 degrees from the Aequator towards the North are all abounding both with Corn and variety of Fruit there are also heards of Cattell and flocks of Sheep in great abundance The Inhabitants are of a great strength the heat of the Air a little exceedeth Mediocrity so that the Inhabitants go naked except the Noble and those that are rich whose clothing is a Linnen Cloth The cause of this fertility and temperate Air contrary to the custom of the Torrid Zone is First many Rivers of which the chief are Senega and Gambea before they discharge themselves into the neighbouring Sea they water those Regions and render the Air more humid and frigid Secondly the vicinity of the Sea which affordeth humid vapours and somewhat cold Winds How the Seasons of the year have themselves in this place and what months of the year Summer and Winter happen and are vigorous I have not found noted by Writers which is to be imputed to their negligence and sloth Yet in one Itinerary I have read that in one of the Islands which lye not far from the Promontary of Cape verd by name Salinae or the Hesperides in one of them I say called St. Vincents the Latitude is 16 degrees the watery months that is Winter are August September November December January even to February This time almost agreeth with the Celestial cause for in the months of May June and July because the Sun is very near or else vertical to that place therefore it maketh the Celestial Summer and here the Terrestrial agreeth with it for then they have a greater heat and dry Air without Rain In the months of February March and April is their Spring be-because the Sun is moved from a moderate distance to a lesser therefore they are then without rains and have a moderate heat The months of August September and October are to be ascribed to Autumn by reason of the rains although it ought to begin latter because the Sun in August hath not yet returned from his least distance to his mean Lastly the months November December and January are Winter because the Sun hath then the greatest distance from their Vertex and then they find more and longer continuing rains with some cold but this is not to be observed every year though most years But how the seasons are in the Continent of Africa is not related except that concerning the shore of Sierra Leon it is contrary as we shall now speak 2. Now succed the Regions of the Coast of Africa which look towards the South and extend themselves from the Promontory of Cape Verd to the curvature or bending part of Africa that is from the West to East These Regions are termed by one name Guiny although others attribute this term only to one part Now they lie in the Torrid Northern Zone 3.4 and more degrees from the Aequator In these Regions there is a continual heat of the Air without any intervening Cold yet they attribute some months to the Summer and some to the Winter I think the same must be understood of the former Western Coast for in the Regions of the Shore called Sierra Leon which is removed above 9 degrees from the Aequator towards the North as also in many Tracts of Guiny they ascribe the months March April May June and July to Winter especially the three first by reason that on these months there fall frequent and almost continual rains hot or warm great Thunders and Lightnings and so great Storms rage without violent Winds that none can easily conceive them See Chap. 21. who hath not had experience of them How they rage I have already spoken also in these months the Fields lie Barren but when these Stormy months are expired then they dig up the dry Earth which hath sucked up the great Rains in the said wet months and mix stamped and bruised Coals instead of manuring and so for the space of 10 days suffer the Earth to putrify and then they sow their Seed There is here so great an heat of the Air joyned with humidity by reason of the propinquity of the Sea that the Fish which are taken stink if kept undressed half a day Therefore in these places the Winter shall be in April May and June when the Storms and Rains rage The Spring in July August and September the Summer in October November and December and the Autumn in January February and March where the Rains and Storms do begin Now all these times of the Seasons in those places are contrary to the Celestial cause or motion of the Sun for in the months of May June and July great heat ought to be there because then the Sun is then vertical or near the Vertex which the heat or warmness of the Rain also
testifyeth contrariwise in the months of October November and December it should be Winter because that the Sun being about the beginning and Tropick of Capricorn is most remote from the Vertex of those places Here therefore the time of the Terrestrial season do much differ from the Celestial seasons The cause therefore of these Rains Storms and Thunders at that time in those places when the Sun is so near is not easy to be explicated But it seems to be that the Sun in the day time forceth up many Vapours from the Sea and Sulphureous exhalations from the Land of Guiny which vapours being condensed by the cool of the Night cause the Rains especially when no continual wind bloweth in these places which may discuss the Vapours But for the most part here is a calm some Storms excepted And these months of Rain which they attribute to Winter are not cold but hot because no wind bloweth and the Sun is Vertical yea the heat is Suffocative which is the cause of shortness of respiration to the Inhabitants And although the Fields be Barren of Grain in these Watery months yet the Trees and Bushes are in their Verdure all the year and bear Fruit. The Day is here equal to the Night almost throughout the whole year the Sun in the East rising at six in the Morning and sets in the West at six in the Evening but the Easterly or Westerly Sun is seldom conspicuous there because for the most part he ariseth involved with Clouds for half an hour and half an hour before he setteth he is again inveloped with Clouds That also deserveth consideration why in the Months of July and August the same Rains and Storms rage not there seeing that the Sun is then as equally nigh to those places as in the months of May and June Moreover why in the Islands of the Hesperides which are not so far removed from Sierra Leon and Guiny the VVinter falleth out in contrary months 3. How the times of the seasons are in the Interiour or Mediterranean part of Africa which is included in the Arch of the Tropick of Cancer the Regions of the Occidental Shore and Guiny or the Land of the Negros concerning which I have found nothing as yet noted but that all those places are almost Steril except those adjacent to the River Niger for that River every year in the months of June July and August overfloweth and communicateth much fertility to those Lands and moreover formeth many Lakes The other places confining on Lybia are infested with violent heat being for the most part Sandy The Watery Months do not seem to bear sway here after the same mode as in Guiny 4. Now follow the Regions of the Coast of the Tongue of Africa which is stretched from the North towards the South and regardeth the West The Regions are Manicongo Angola and the like from the second degree of Nothern Latitude even to the Tropick South of Capricorn beyond the Aequator Now the Kingdom of Congo beginneth from the second degree of South Latitude The Winter in these places is like the constitution of the Vernal season in the Territory of Rome in Italy the heat temperate so that they alter their Garments in no time of the year Neither are the tops of the adjacent Mountains infested with cold Here almost with our Spring the Watery Winter beginneth and continueth April May June July August and good part of September At that time the Summer beginneth which possesseth the other Months even to the 10 of March even in this Summer they have no rains or at least very little and seldom have a continual serenity But in the Watery Months the Sun is scarce to be seen on any day perpetual Clouds and rain so obstructing the Air also frequent Travados or Storms It doth not rain whole days but for the most part hours before and two hours after noon great drops fall which are soon received by the droughty Earth Therefore although the Inhabitants divide the year only into two parts it may be distributed into four our common people also do usually divide the year into Summer and Winter because the Spring is comprised in the Summer and the Autumn in the Winter These times of the Terrestrial seasons in these places almost agree with the Celestial course for from the 25 of March April May June July August to the 25 of September the Sun departs from those places to the Tropick of Cancer where he is most remote from them the 21 of June and the rest of the time he approacheth again to them so that on the 30 of September he becometh vertical to them and goeth to a moderate distance towards the Tropick of Capricorn and returneth from thence in the months of October November December January and February so that in March he again becometh vertical therefore in those Months they have a Summer by reason of the vicinity of the Sun whose effects are not here hindred by a Terestrial cause And then again in the Months from the 10th of March to the 10th of September they have Winter because then the Sun is more removed from them but the times of the Spring Autumn Summer and Winter which we have assigned do not well agree with the Celestial course and I doubt whether the Summer and VVinter may be distinguished into the Spring and Autumn in those places Therefore here a more easy cause may be rendred why in those Months from the 10 of March to the 10 of September they should have a quotidian Rain and some kind of VVinter viz. because the Sun departs from their vertex towards the place of the greatest distance but this cause is not only sufficient because it is not able of its self to produce such an effect but another must be added The tops of the Mountains which lie not far from these Maritime places towards the east are discerned in those watery Months to be continually covered with Snow The Wind is the North-west Wind. and this is caused by reason of the fixed wind which in these Months there bloweth therefore the Sun elevateth the Vapours very much from the Sea And this fixed Wind forceth them towards the tops of the Mountains where they are condensed and then turn to Rain and from the Rain which falleth from the Mountains springeth the inundation of the Nile and other Rivers of Africa Moreover we must know that in these watery Months the Rivers of Congo overflow the adjacent Fields which causeth great Fertility in them and also disgorgeth great quantities of water into the Sea 5. In the Maritime Region Lowango adjacent to Congo there are also observed to be Rainy Months and other Months of Summer that are serene but that which is to be admired is that they are not the same with those in which we said the Rain doth wax vigorous in the Months of January February March and April when yet it is Summer and a serene Aire in January and February in Congo Here therefore the Terrestrial Season is repugnant to the Celestial because that in January and February the Sun is not most remote from those places and therefore they should not have Rain but rather Siccity Without doubt the cause is
the Brazilians in the months of October and February and striketh the Earth with reflex raies at most acute Angles Which diversity of these Regions promiseth the Inhabitants perpetual health by reason of the often calms and the Air quelling all noxious heats Hence it is easy to dollect that the seasons of the year do not so much depend immediately on the Sun and his motion as on the species of the Winds the diversity of aspects of the Stars the quality and peculiar scituation of the Region Moreover in these Mediterranean Regions towards the West the nights are more cold than in the Maritim so much some times that the Frost seizeth on the very hairs of the Peoples In the same months from the East about the Ocean is Summer and Siccity No Islands are opposite to Brazilia from the West beyond the ridges of the Mountains and the Marshes of Brazilia is the Winter Fogs and Rain Oftentimes the Heavens may be seen covered with vast Clouds from the East towards the West but those again very thin except in the days of the Rain the Sun both rising and setting may be beheld with fixed eyes for there is a wonderful serenity on every side especially towards the evening which never afordeth any Vapours or Clouds to the succeeding Moon but renders the night so clear that the old and new Moon may be seen in one and the same day and letters may be well read it the quarter Moon The Aether in respect of the diversity of the Planets other inseriour causes acceding receiveth its distemperature for the Heaven about evening is bright with Lightning without Thunder in the most dry and serene season The drops of Rain are very great and fall with great violence which is wont to be preceeded by a suffocative warmness The Dew here is more fruitful than that of Europe being impregnated with much Winter and therefore is more penetrating and thin especially in Summer which is manifest in all Mettals and in Iron especially which it easily eateth up without the assistance of any Clouds The Meadows and open Fields do less wax green in the Summer but more especially in the Pluvial months although the Earth then seemed somewhat more sad to the Inhabitants and the places unfit for Tillage afford Pasture See Piso All the Lands of Brazilia arise into moderate and pleasant Hills there are no Mountains of any great hight in the Coasts but yet some are discovered afar off in the Solitudes among the barren hills yet not every where but with some intervals of Miles the Valleys are interposed every one irrigated with some small Rivers and for that reason are not only fertil in the pluvial months but also in those of the Summer The Hills in the Summer months are steril by reason of the heat of the Sun so that they wither and Grass doth not only die on them but sometimes the Trees also It very seldom raineth throughout the whole day and night and for some continual days very seldom without intermission the Pluvial months do a little differ In the year 1640. as Marriners have observed there were 7 Pluvial months viz February March April May June July and August But most and almost continually from April May and June In the year 1642. the most Pluvial months six viz. March April May June July and August But the account of the other years was not much different Now these observations are to be taken only for one place and not for all the places in Brazilia Hence it is manifest that the Summer and Winter of Brazilia answereth to the Celestial account seeing that in the greatest distance of the Sun they have Rain and in the least and moderate towards the South they have heat Yet there are not a few irregularities the cause of which are to be sought from the scituation of the Winds and Earth The six rainy months are May June July August September and October 18. This is enough for the Southern America in the Northern it is otherwise For in the Province of Nicaragua it raineth for six months and the other six months it is Summer and dry weather so that passengers may travel in the night This now is contrary to the Celestial course for in the wet months for in May June and so on to November the Sun is vertical or near the Vertex unto these places so that then they should have Summer and Siccity and not Rain In November and December it is very distant therefore they should there have Rain Thus have we declared the Seasons of the chief places of the whole Torrid Zone from which being compared one with another we collect 1. That in some places the cold is scarse sensible in some part of the year and therefore the Winter is rather to be defined by the Rains than by cold in those places 2. In some places the cold is sufficiently sensible 3. In the night time especially in the last quarter the Air is discovered to be very cold by reason of the depression of the Sun beneath the Horizon 4. That it is not the least cause of the tolerable heat and that those Regions are inhabited viz. that no days are there long but almost equal to the night for if the days were as long there the Sun remaining above the Horizon as in the places of the Temperate and Frigid Zones then doubtless they would be uninhabited 5. That the Winds do much diminish the heat of the Sun 6. That places which ly in one and the same Climate have the Summer and Winter in divers times although they be very near to one another 7. That those places which have Siccity and Humidity contrary to the access and recess of the Sun are so scituated that on the East they have Ridges of Mountains and that they regard the West Peru excepted 8. That the Seasons observe no certain rule in the places of the Torrid Zone 9. That although most of the Inhabitants divide the year into two Seasons which is likewise observed by many Writers to wit a Pluvial and Dry Season yet it may aptly be divided into four so that they may not only have a Summer and a Winter but also a Spring and an Autumn For as in our parts the Spring approacheth near the nature of Summer and the Autumn of Winter so also the dry places of the Torrid Zone may be divided 10. And lastly in some places there is a continual Harvest in some only in two parts of the year and in others only in one part of the year Proposition XII To shew how the four Seasons of the year are made c. in the places of the Temperate Zones Of the seasons of the year in places lying in the Temperate Zones 1. In these places that cause which we have placed in the first place amongst the causes of the Seasons in the first Proposition of this Chapter is so potent in respect of the other causes that that
above almost maketh up and moderateth them To wit in the Regions of the Northern Temperate Zone it is Spring and Summer the Sun going from Aries by Cancer to Libra because then he is more near them Then the Sun going from Libra through Capricorn to Aries it is Autumn and Winter But in the Southern Temperate Zone the matter is contrary neither can those other causes altogether disable the force of this first and induce a new course of the seasons and be able to alter the times as in the Torrid Zone 2. Yet those Seasons of divers places vary so that in one place there may be more Heat or Cold or Rain than in another although the places lie in the same Climate but yet they cause not the Winter to be changed into Summer or Summer into Winter A Rocky Marshish and Maritim Land findeth somewhat another degree of heat or cold than Vallies or a Chalk and Maritim Land 3. The places in the Tropicks for the most part in the Summer have an excessive heat others a Pluvial Season so that they almost approach to the nature of the places of the Torrid Zone So in the part of the Kingdom of Guzarat lying without the Tropick at the same time the wet and dry months are observed which in the part lying beyond the Aequator the Summer is changed into a Pluvial Season yet then there is greater heat than the dry part of the year where they have a moderate cold and in truth in the places of the Temperate Zones we judg the Summer and Winter not from the drought and rains but from the heat and cold Now in the Coasts of Persia and Ormus there is so great heat without Rains in the Summer by reason of the vicinity of the Sun rhat both the Men and their Wives ly in Cisterns full of Water The like heat is in Arabia The Regions of Africa on the Mediterranean Sea are called the coast of Barbary Throughout all Barbary the middle of October being past Showers and Cold begin to increase and in December and January the cold is perceived more intense and that only in the morning and withal so remiss that the Fire is not desired February taketh away the greatest part of the cold from the Winter but yet it is so inconstant that sometimes 5 or 6 times in one day the Air changeth In the month of March the North and West Winds blow violently and cause whole trees to be vested with blossoms April giveth form almost to all Fruits so that the entrance of May and the end of April is wont naturally to produce Cherries In the middle of May they gather Figs and in the middle of June in some places are ripe Grapes Of the seasons of the year of Barbary the Figs or Autumn are gathered in August and there is no greater plenty of Figs and Pears than in September There is not so great intemperies of the year in those places but that the three months of the Spring are always temperate The entrance of the Spring that is the Terrestrial not the Celestial is as they reckon on the 15th of February and the end the 18th of May in all which time the Air is most grateful to them If from the 25th of April to the 5 of May they have no Rain they esteem the same as ominous They count their Summer even to the 16th of August at which time they have a very hot and serene Air. Their Autumn from the 17 of August to the 16 of November and they have that for two months to wit August and September yet not great That which is included between the 15 of August and the 15 of September was wont to be termed by the Antients the Furnace of the whole year and that because it produced Figs Pears and that kind of Fruit to maturity From the 15 of November they reckoned their Winter which they extend to the 14 of February At the entrance of this they begin to till their Land which is the plain but the mountainous in the month of October The Africans have a certain perswasion that the year hath 40 very hot days and on the other side so many cold The Opinion of the Arabians days which they say begin from the 12 of December They begin the Aequinoxes on the 16 of March and on the 16 of September Their Solstices on the 16 of June and the 16 of December The end of their Autumn all their Winter and a good part of their Spring is full of violent Winds accompanied with Hail Lightnings and dreadful Thunders neither is there wanting in many places of Barbary an abundance of Snow In Mount Atlas 7 degrees distant from the Tropick of Cancer they divide the year only into two parts for from October even to April they have a continual Winter and from April again to October they have Summer In this there is no day in which the Mountains tops glitter with Snow The seasons of Numidia In Numidia the parts of the year swiftly pass away for in May they reap their Corn in October they gather their Dates but from the middle of September to January a violent Frost continueth October abstaining from Rains all hopes of Sowing is taken from the Husbandman the same hapneth if that April produceth not Pluvial Water Leo Astricanus remembreth many Mountains of Snow in Africa not far from the Tropick of Cancer Of China The North part of China although no more remote from the Aequator than Italy yet it hath a cold more sharp for great Rivers and Lakes are congealed up with Frost the cause of which is not yet sufficiently known except we should refer it to the Snowy Mountains of Tartaria not far remote to the avoyding of which cold they abound with the Skins of Foxes and Scythilian Rats New England New England although it lie in 42 degrees of North Latitude and therefore no more removed from the Aequator than Italy yet in the month of June when Sir Francis Drake was there the Air was so vehement cold that he was compelled to sayl back to the South for the Mountains were then covered with Snow The cause is the Frigid temperature of the Earth being Stony The seasons of Aegypt In Aegypt which is bounded with the Tropick of Cancer the Spring and Temperate Season of the year is observed about January and February The Summer beginneth with March and April and continueth June July and August The Autumn possesseth September and October The Winter hath November and December About the beginning of April they Reap their Corn and presently thresh it After the 20 of May not an Ear of Corn is to be seen in the Fields no Fruits on the trees On the Ides of June the inundation of the Nilus beginneth The seasons in the streights of Magellan In the Streights of Magellan and the adjacent Regions although they be no more distant from the Aequator than our parts
vicine place is to be found whereby it may come unto those Northern Regions Seeing that therefore this flux is perpetual neither doth the water come by a manifest way unto those Regions whence the flux is made therefore it seemeth necessary to conclude that the waters come through subterraneous passages unto those Northern Regions and so there to be effused from the holes of the Channel as from a spring and that the water moveth hence towards the South There falleth in another cause taken from the former For the water of the Ocean in the Torrid Zone is more heavy than that in the Northern places by reason of the great abundance of Salt as we have proved in the Eighth and Twelfth Proposition Therefore the water or Ocean in the Torrid Zone doth more press through the Orifices of the Subterranean passages than in the Northern places and therefore in these places the water less resisting suffereth the water to flow from the Orifices of the Channels Unto this I answer That that flux of the Ocean is not only from the North as the Objection seemeth to inferr and as some especially the Ancients conceived of it who would have the water to flow in four Channels from the very Pole as also some Geographical Maps do exhibit it neither is it continual but is observed by reason of the frequency of Northern Winds moreover the great and perpetual abundance of Snow and Rain in those places augmenteth the water and causeth it to flow towards the South Add likewise that in other parts another motion of the Ocean is found concerning which see the following Chapter 3. It seemeth not absurd but rather most true that all the Fountains of Rivers taken together disburthening themselves into the Ocean are the very Fountains of the Ocean For seeing that in perpetual progress of time so great an abundance of water floweth from them into the Ocean questionless the water cometh from the Ocean to the very Springs and Channels of the Rivers partly through the Subterranean passages and partly by Rains 4. It may seem to prove that the Fountains of the Ocean may be in the very Channel because that in the bottom of the Ocean in some parts sweet or fresh water is found which could not be but by some Fountains flowing in the bottom Linschaten relateth that in Ormus fresh water is drawn by divers in the Ocean at the depth of four or five Orgya and the like Fountains are found in other parts of the Ocean and Bays Unto this I answer That few such Springs have yet been found which suffice not the vast Ocean Neither do we dispute concerning these Fountains as we have said before Hence it is manifest that in some sort it is true and we may well say that the Ocean hath Springs but not in that sense that we are wont to speak concerning the Springs of Rivers and in which we would have our Proposition to be taken Hence also it is manifest what we ought to think concerning that Question viz. Whether the Sea is always one and the same and perpetually so remaineth or whether it be another thing whose parts are perpetually consumed and generated again Proposition VIII The saltness of the Waters proceedeth from the particles of Salt which are mixed with it but whence they may exist or are so augmented is the doubt Of the Saltness of the Sea-water Experlence proveth the first member of the Proposition by which it is commonly known that Salt is made of Sea-water by decoction of the water or by the heat of the Sun or the fervour of the Fire In Germany and other places the water is separated by the help of the Fire In France the greater heat of the Sun performeth the same the Ocean being let into certain Trenches made in which in the space of some Months the water being exhaled by the force of the Sun Of Salt and of what made concreted and hard Salt is found On the shoars of many Regions as of England and other parts plenty of Bay-Salt is found the Sea-water continually overflowing those shoars leaveth daily some particles or humors from which the water exhaleth and concrete Salt is left whose blackness is taken away by boyling although it be washed away and dissolved from many Coasts by the violence of the Ocean which is the cause that it is not found on all Coasts Seeing therefore that this Experiment is common Aristotle had small reason to alledge a false Experiment concerning a waxen Vessel let down into the Sea Hence it is manifest that the proximate cause of the Saltness of the Sea-water or the true subject of this saltness is the Saline particles which are contained in that water Therefore the Aristotelians with their Master spake improperly and obscuredly without cause when they defend and say That the saltness of the Sea proceedeth from the adustion of the Sea caused by the Sun or from the adust particles But of this more anon The chief difficulty and controversie is concerning the other member of the Proposition Whence these Salt particles of the Ocean exist Aristotle supposeth that dry exhalations or fumes all which he saith are of an adust and Saline nature elevated from the Earth are mixed with humid vapours and when that these have met together in Rain they fall with these into the Sea and that thence proceedeth the saltness and Salt particles in the Sea See Aristotle lib. 2. chap. 7. and on this account he seemeth to defend this Opinion because that from thence he may render a reason why the Sea is always salt But other Peripateticks will have it and so do endeavour to draw Aristotle to their part that this saltness is in the Sea it self by reason that it is perpetually scorched by the heat of the Sun a sign of which is that the water is found by so much the less salt by how much it is more deep or remote from the superficies for in the superficies we discover it to be most salt Both these Opinions are obstructed with great difficulties and absurdities so that it seemeth wonderful that the minds of Philosophers and Learned men could acquiesce in them First the opinion of Aristotle is thus obstructed that Salt-rain should be found in the Ocean which never yet was found to be void of all tast of salt Secondly the Sea should be less salt when it raineth not for a long time the contrary of which yet is found The other Opinion hath these difficulties 1. It is false that the waters of the Ocean are found the less salt by how much they are nigh to the bottom for there are few places viz. in those bottoms where Springs of fresh water do flow 2. Experience testifieth that fresh water although long exposed to the Sun or heat of the Fire yet doth not become salt This Objection Scaliger endeavoureth to avoid by an over-nice subtilty for he saith that this hapneth in these Observations by reason of
the exiguity of the water which doth not grow thick but resolveth For although you take a great quantity of water and that you provoke with a light and gentle fire that the resolution may be impeded yet the water acquireth no salt tast 3. Lakes and Marshes though heated by the Sun yet wax not salt This Objection also Scaliger endeavoureth to avoid saying that this hapneth by the succession of fresh water And the same is found in those standing Pools and Lakes which only proceed from Rain or Snow dissolved where there is no place for that refuge of succession for those Lakes are rather dried when that it raineth not for a long space than turned into Salt or rendred salt Therefore rejecting those false Opinions concerning the cause and original of Salt in the Ocean let us lay hold of one of the most probable Opinions with little or no difficulty in it viz. 1. That these particles are Coeternal with the very Ocean and therefore we should no more dispute concerning their original than concerning the original of the Ocean it self the Earth yea and of the original and generation of the World 2. If that this Opinion be less complacent we may make choice of another viz. that these salt particles are here and there pulled from the Earth and so dissolved into water Now it is certain that there are many saline Mountains or Rocks in the bosom of the Sea Isle of Ormus a salt Rock The whole Isle of Ormus is nothing else but a white and hard Salt of which they make the Walls of their Houses and therefore no Fountain of fresh water is found in that Isle And none can be ignorant how that many mines of Salt are found on the Land and we have related concerning some in the Eleventh Chapter but we need not particulars Let us consider the whole Earth The greatest part of the Earth hath much Salt in it the greatest part of which is nothing else but a Salt for it hath its consistency from Salt for the Chymical Philosophers do rightly prove that the consistency and compaction of every thing proceedeth from Salt and Experience is answerable to the Assertion for if that you take an hard piece of Earth and burn it to ashes much Salt will be found in it Nothing can be alledged against this Opinion that is of any value and is not easily refuted for some say that it is impossible that those salt parts of the Earth should perpetually suffice and should not at some time or other be consumed by the water of the Ocean which continually taketh away some part of them Unto this I answer That the Salt of the Ocean is not consumed in so great abundance that it should stand in need of much instauration and if that any be consumed yet notwithstanding that is laid up in another place seeing that it is not removed out of the Earth Proposition IX Whether that Water be the fresher in the Ocean by how much it is nigher the bottom and why in some parts of the Ocean fresh Water is found in the bottom Of the freshness of Water in the Sea Unto the first I Answer That experience doth not testifie concerning that sweetness but in some places of which the other Question speaketh that in these places in the bottom of the Sea are Fountains of fresh water I have sufficiently said for it cannot naturally be that the more Salt-water should exist above water less Salt seeing that that is more heavy Those places of the Sea where fresh water is found to spring at the bottom may be collected by those that are studious from the Writers of Geography Proposition X. The Water of the Ocean becometh less salt by how much it is nearer the Poles and on the contrary the more salt by how much it is more near the Aequator or Torrid Zone Although this may be understood of most parts of the Ocean yet the Proposition admitteth of some exceptions The cause of this inequality in saltness is sixfold The Causes of the inequality of the saltness of the Sea in different places 1. That the heat of the Sun in the Torrid Zone lifteth up more vapours from the Ocean into the Clouds than in the Northern places which are the vapours of fresh-water because that the particles of Salt by reason of their gravity are not so easily lifted up Seeing therefore that from the Water of the Ocean of the Torrid Zone or where the place is more near the Torrid Zone so much the vapours are separated by the heat of the Sun thence it cometh to pass that the water that is lest is found more salt there than in the Northern places where there is not so much fresh-water separated by reason of the weak heat of the Sun The 2d Cause 2. The second Cause is the heat or cold of the water for the same numerical water or salt meat as also pickled meat sauce and the like afford a more sensible saltness to the tast when they are eaten hot than when cold for the heat or particles of the fire do move and render the particles of the salt contained in such meat more acute and separates them from the admixtures whence they bite and prick the Tongue more sharply Now because the water of the Ocean is the more hot by how much it is nigher the Aequator or the parallels of the Sun at every day and contrariwise the more cold by how much it is more near the Pole thence it followeth that waters though they should contain the same quantity of salt yet they must seem and appear so much the salter to the tast by how much they are nearer to the Torrid Zone and by how much they are more near the Pole by so much they have less sensible Salt The 3d Cause 3. The third Cause is the more or less quantity of Salt in the diverse parts of the Channel of the Ocean for as we find in the parts of the Earth that there are not pits of Salt in them all neither where they are found is there the like quantity of Salt must be held concerning the part of the Earth that the Sea washeth or covereth that is the Channel or the Shoars where there is therefore most quantity of Salt or Mineral in the bottom or shoar of the Ocean there the water is more salt because that it is impregnated with a greater quantity of Salt So the Isle of Ormus consisteth all of Salt therefore the adjacent Ocean hath very Salt waters But whether there be greater plenty of Salt in the Channel and shoars of the Ocean in the Torrid Zone or more saline Mines than in the North is very doubtful by reason of the want of observation yet it seemeth probable unto some that there is greater quantity of Salt in those places by reason of the greater heat of the Sun by which the parts of the water are separated from the Terrestrial and
Salt but this is a deceitful sign The 4th Cause 4. The fourth Cause of the unequal saltness is the frequency or scarcity of Rains unto which we may add Snow and in the Northern places Snow and Rain is frequent in the places of the Torrid Zone they are less frequent in some parts of the year and in othersome they are almost continual And therefore in these places in the pluvial Months the water of the Ocean is not so salt on the shoar and hath less Salt in it than in the dry Months Yea in many Regions of the Coast of Malabar the Ocean is fresh in the pluvial Months by reason of the abundance of water that floweth from the top of the Mountain Gatis and falleth into the Sea for this very reason in divers Seasons of the year the same Ocean is of a various saltness yet because in the Northern places the Rains and Snows are continual throughout the whole year therefore this Sea is less salt than in the Torrid Zone The 5th Cause 5. The fifth Cause is the dissimilary solution or unequal faculty of the Water to dissolve this Salt and unite it to its self for hot water sooner uniteth Salt unto it self than cold Water although therefore in the Northern places of the Ocean the shoars and Channels of the same contain more or the like quantity of Salt that those places of the Torrid Zone do yet because the water is there more cold it is not so able to dissolve and unite the Salt to it self so subtily us the water in the Torrid Zone which is more hot The 6th Cause 6. The sixth cause is the exoneration of many and great Rivers into the Sea but this cause only taketh place in the parts of the Ocean that are vicine to the shoars but is not discovered in the remote parts So Mariners affirm that the Ocean on the Coast of Brasilia where the Silver-River disburtheneth it self loseth it saltness and affordeth fresh waters fifteen miles distant from the shoar The same is observed of the African Ocean on the Coasts of Congi where the River Zaire exonerateth it self and of many more Rivers Unto these add runing Fountains in some parts of the bottom of the Ocean These are the Causes which seem to concur to the variety and diversity of saltness in divers parts of the Ocean from which the saltness of every one of the Seas may be explained From whence also it is easy to give an account why the water of the German and Northern Ocean is less apt to separate Salt from it self by coction than the water of the Spanish Ocean the Canary Isles and that of Cape Verd whence the Dutch fetch Salt in great abundance and transport it into the Northern Regions viz. this Ocean is more near the Torrid Zone and receiveth water from the Ocean of the Torrid Zone the other is more remote from the Frigid Zone yet I cannot deny the constitution of the Channels themselves to be more or less saline The Sea-water at Guinee in the Ethiopick Ocean affordeth Salt at one coction as white as snow such as neither the Spanish Ocean nor any other in Europe do produce at one coction or boyling Proposition XI Why Rain-water in the middle of the Ocean is found sweet but the water which we separate from the Marine or Salt-water either by decoction or distillation is yet notwithstanding found salt when yet the Rain-water proceedeth from the Vapours exhaled from the Sea Fresh-water abstracted from Salt-water The Learned Chymists or true Naturalists have hitherto laboured in vain that they might find out an Art by which they might distill and abstract fresh water from the water of the Ocean which would be of great advantage but as yet their Labours have proved fruitless for although as well in the decoction as distillation Salt may be left in the bottom of the Vessel yet the water separated by decoction as well as distillation is yet found salt and not fit for men to drink which seemeth wonderful unto those that are ignorant of the cause Yet Chymistry that is true Philosophy hath taught the reason for by the benefit of this we know that there is a twofold salt in Bodies or two kinds of salt which although they agree in tast yet they much differ in other qualities one of these Artists term fixed the other volatile salt The fixed salt by reason of its gravity is not elevated in distillation but remaineth in the bottom of the Vessel but the volatile salt is full of spirit and indeed is nothing else but a most subtile spirit that is elevated by a very light fire and therefore in the distillation ascendeth with the fresh water and is more firmly united by reason of the subtilty of the Attoms neither is this volatile salt found only with fixed salt in Sea-water but almost in all bodies as Chymistry proveth by experience but in some in a greater and in othersome in a lesser quantity in a greater quantity in sharp tasted Herbs in a lesser in oily Herbs Therefore difficulty consisteth in the separation of this salt spirit or volatile salt from the water But why the pluvial water in the midst of the Sea is no less fresh than on the Land seeing that yet it is generated by abstraction of the exhalations of the Ocean caused by the fervour of the Sun or from some subterraneous fire which evaporation doth little differ from distillation The cause seemeth to be Fourfold 1. A slow operation by which the tenuous part is only elevated from the Ocean which although it containeth a saline volatile spirit yet it hath it in less quantity than if that this exhalation were caused by a more forcible heat 2. The long way that this vapour passeth through before that it arriveth unto that Region of the Air where it is condensated into rain in passage it is possible that the saline spirit is by degrees separated from the watery particles 3. The admixture of other watery particles existing in the air 4. A Refrigeration Coition and condensation of the vapour for these exhalations exhaled from the Ocean by degrees are more and more refrigerated and being conjoyned with other obvious and admixed vapours they condense into a more thick vapour or cloud in this Refrigeration and condensation or coition of the saline spirit with the fiery particles they fly into the more exalted part of the Air. Now why the same is not performed in distillation where the vapours exalted are also condensed the cause is 1. That by reason of the small passage the saline spirit is as yet over straitly conjoyned to the watery particles 2. That the vapour restrained in the vessel admitteth not a free passage to the evolant spirit Proposition XII Sea-water is more ponderous than fresh water and the water of one Sea is more heavy than another Sea water more heavy than fresh water The cause is manifest from what hath been said
many places but in some in greater quantity than in others Serpents on the Coast of Malabar On the Coast of Malabar and at Cambaja Serpents are discovered on the superficies of the water this is a sign to Sea-men that they are near to those Regions About four miles from New Spain many Roots Bulrushes and Leaves like unto Fig-leaves float on the water which they eat and are in tast like unto Coleworts In the description of the first Navigation of the Dutch unto the Streights of Magellan we read that on the 12th of January in Anno 1599. the water of the Ocean not far from the Silver-River or Rio de laplata in Brasil appeared of a red and bloody colour but being drawn up in a bucket or the like when that they had more throughly viewed it they found that an innumerable multitude of Worms of a red colour were contained in that water and being taken up in the hand they leaped like unto Fleas And these Seamen call Sea-fleas and they are supposed to come from an innumerable company of small Crabs which being found on the South Continent fill the Sea Here is no place to treat of the Animals of which there are various kinds in divers places of the Sea Proposition XVII Why the Sea in the Night season seemeth to glitter especially if that the Waves be raised the more vehemently by the Winds The Sea in the Night seemeth to glitter or shine This question requireth the knowledge of that difficulty concerning the causes of Colours Divers are the resolutions of Philosophers concerning them but as for the explication of the proposed phenomenon or Question that Opinion seemeth the most commodious which sheweth how Colours do exist or rather appear from a certain and various motion but we leave the accurate explication of the same to Naturalists Proposition XVIII The Ocean or rather all Water casteth out Terrestrial Bodies on the shoar especially in the Full Moon Terrestrial bodies are cast out of the Ocean on the Shore It is not difficult to render an account of this property which Experience sufficiently testifieth For Water is never without some motion which if it be swift and towards one quarter it carrieth Terrestrial bodies with it until it meeteth with the shoar where by reason of the ceasing vigour of the motion of the water those Terrestrial bodies are laid down but in the Ocean the Waves are carried hither and thither By these the Terrestrial bodies are carried after the same mode and because that all Waves tend to some coast of Land therefore all Terrestrial bodies are carried towards the shoar In the Full Moons is the greatest motion of the Ocean therefore vain is their Opinion who believed the Ocean to be an Animal and to have sense by which it purgeth it self from all dregs Terrestrial bodies but here the cause is sufficiently manifest CHAP. XIV Of the Motions of the Sea in general and in particular of the Flux and Reflux Proposition I. Water hath no natural Motion except one by which it moveth from a more higher place unto these that are more low but if the vicine place or body be equal or of a greater Altitude than the superficies of the Water then the Water naturally resteth that is it is not moved except that it be compelled by a violent cause Water hath no natural motion except one THe truth of this Proposition is manifest from Vulgar experience for if that a vessel containing water be moved the water so long fluctuateth in it until no part be higher than the other that is until they compose a Spherical figure or superficies as we have said in the Thirteenth Chapter For although this Motion hath a violent cause viz. the motion of the Air about the Earth yet because that there is a great question concerning this cause and it is so manifest in the water that it seemeth not to come unto it from an external cause so for to distinguish this motion of the water from other motions we term it Natural Now this motion is unto that quarter unto which the place more depressed is scituated Proposition II. When part of the Ocean is moved the whole Ocean is moved or all the other parts of it are also moved but by so much the more that every one is nearer the part moved For because that if part of the Ocean be moved it doth necessarily change place and therefore this place is more low than the place of the vicine water this nearer water shall be moved into this place and the vicine water of that into the place of that and so forward in the other parts But there is lesser motion in the places of the more remote parts Proposition III. To observe the quarter into which the Sea that is moved tendeth The quarter into which the Sea that is moved tendeth Chuse a time if you can when no violent Wind bloweth and cast into the Water a body almost of the same gravity with the water let the place be observed where it was cast in to wit let the Boat remain there immovable then when that this body is carried by the Sea a moderate space from the place where it was cast in then let another Boat be placed of that and let the quarter be observed into which the scituation of this second Boat vergeth from the former For this also shall be the quarter in which we say that the Sea at that time is moved Proposition IV. The Motion of the Sea is either direct or a Vortex or a Concussion I call that direct which tendeth unto some quarter a Vortex when the water moveth into a round and is in some part rejected a concussion when it trembleth But laying aside the two latter unto the end of the Chapter we shall treat of the direct motion and therefore we shall call this by a general term the Motion of the Sea Proposition V. Of the Motions which we find in the Sea some are general some proper and singular other some contingent General proper and singular motions of the Sea I call that General which is found almost in all the parts of the Ocean and that at all times I call those proper and special motions by which only some parts of the Ocean are moved and they are twofold perpetual and anniversary the former are those which persist without mutation or cessation the other which are found at certain months or days of the year in some certain Sea I call those motions of the Sea contingent which without any certain order sometimes do cease and other some begin such are infinite Proposition VI. Wind is the cause of the contingent motion of the Sea forcing the Sea to a quarter opposit to the Wind neither is the Sea ever free from such motions Wind is the cause of the motion of the Sea For seeing that the Air toucheth the Sea and the Wind is nothing else but a strong commotion of
the Air and a pressure towards the Earth therefore the Air being forced to the Sea endeavoureth to drive it from its place and by reason of the Sea is fluid and not able to resist the forcing Air therefore it is moved from its place towards the place of the opposite quarter and forceth another water and this another and so on Now seeing that there is always some wind in the Air sometimes in this place and sometimes in that and sometimes diverse in divers places at one and the same time thence it followeth that there are certain contingent motions always in the Sea which are more discernable in the parts nearer the Wind and therefore the rather by reason that the Sea doth most easily receive an impression because it is fluid Proposition VII The general motion of the Sea is twofold one continually from the East to the West the other composed of two contrary Motions which is termed the Flux and Reflux of the Sea in which the Sea at certain hours floweth to the shoar and in certain others floweth back again We shall first treat of the first The motion of the Sea twofold That the Sea moveth from the East to the West continually is chiefly proved from the motion of that Sea which lieth in the Torrid Zone between the Tropicks For because the motion is more strong hence it is less hindred by other motions This Motion of the Sea is manifestly found by those that sail from India to Madagascar and Africa also in the Pacifick Ocean between New Spain China and the Moluccoes also in the Ocean between Africa and Brasil So through the Streights of Magellan the Sea is carried from the East to the West with a vehement motion So through the Streights Manillan through Channels between the Isles Maldives the motion of the Sea carrieth Ships from the East The Sea glideth impetuously between Cuba and Jucatan into the Gulph of Mexico and floweth out into Cuba and Florida At the Gulph of Paria there is a violent influx so that that Gulph is termed Os Draconis the Dragons Mouth Famous also is the flux at the Land of Canada From the Tartarian Ocean the Sea moveth through the Streights of Nova Zembla and Waigats Streights which is proved both from the very motion it self and also from the abundance of Ice which the Tartarian Ocean casteth up at the Streights of Zembla And at the Northern shoar of America in the Pacifick Ocean the motion is towards the Streight Anian also from Japan the Sea is moved towards China So in the Streight Manillan the motion is from East to West so also in the Streight Java And when the Atlantick Ocean is moved towards the Coast of America the contrary is found in the Pacifick Ocean For this is moved from the shoars which is the most conspicuous at Cabo dez Correntes between Panama and Lima. Proposition VIII The winds oftentimes change the general motion of the Sea especially those fixed winds which we shall shew to be termed Motions in the XXI Chap. The motion of the Sea oft-times changed by the winds For because that most of these do blow from the South and North or from the Collateral quarters of these thence it cometh to pass that the Sea by reason of its general motion tendeth towards the West it moveth towards the Collateral quarters of the West viz. North-west or South-west yea the general wind when that it seldom bloweth from the East but most commonly from the Collateral quarters of the East changeth this general motion of the Sea Much more do the North winds in the Northern Sea where the general motion is little discernable in the parts of the Ocean Proposition IX The cause of this general motion of the Sea from the East to the West is uncertain The Opinion of Aristotle and Copernicus concerning the general motion of the Sea from East to West The Aristotelians suppose although it were unknown unto Aristotle and his followers and indeed to all the European Philosophers before the Navigation of the Portugals through the Ocean of the Torrid Zone that it is caused by the prime motion of the Heaven which is not only common to all the Stars but also to the Air in part and to the Ocean by which all are carried from the East to the West But some that follow Copernicus as Kepler although they also acknowledge the Moon also the cause of this motion yet they determine that the motion of the Earth doth not a little contribute unto this motion viz. they suppose that the water seeing that it is not continuous but only contiguous unto the Earth cannot follow the circumrotation of the Earth and resist it towards the West whilst the Earth withdraweth it self towards the East and therefore that the Sea moveth not from one part of the Earth unto another but that the Earth leaveth part of the waters one after another Othersome who are not pleased neither with the solution of Aristotle nor Copernicus having recourse unto the Moon will have her to be Empress of the waters and that she leadeth about with her and draweth the Ocean from the East to the West If it is demanded how they reply there is an occult faculty influence sympathy vicinity to the Earth and such like indeed it is very probable that the Moon is the causer of this motion by reason that in the new and full Moons this motion is more violent than in the quarters where the motion for the most part is very little The most acute Cartesius hath explained a Mathematical mode by which the Moon causeth both this motion of the water and Air for he supposeth according to his general Hypothesis that an infinite number of Atoms do move round about the Earth by which the space even unto the Moon is filled without any Vacuum which space he calleth the vortex of the Earth viz. Let the Earth be FEGH The water 2143 the Air 6587. the vortex of the Earth B A D C the Moon B. Therefore saith he if that there were no Moon in the vortex B A D C the particles of its vortex would be turned round about the Center T but because that the Moon is in it therefore the space through which the Celestial matter floweth between B and T is rendred more Angust and thence it followeth that the Celestial matter floweth there more quick between B and T and therefore more presseth the superficies of the Air in 6 and also the superficies of the water in 2. than if the Moon were not in the Diameter of the vortex B D and seeing that both the bodies of the Air and water are fluid and easily plyant to this pression it must not be so high above the part of the Earth F as if the Moon were without the Diameter B D. and on the contrary must be more high towards E. But whilst that the Earth is carried from E through F towards G or from the
dissolved Snow And this they take for a sign of it that Rain and dissolved Snow do much augment the Rivers that oftentimes they extend beyond their Channel and overflow Regions also that Rivers do much decrease and some lesser sort of them are altogether dried up when no Rain for a long while in the Summer season hath fallen because that their Channel is not very profound and therefore have collected little water but those that have a deep Channel are not dried up in the Summer by reason that they have gathered so much water from the Rains that fell and dissolved Snow so that all cannot be turned into vapours except by a daily and continual heat 2. Because that there are very few Rivers in those places where there is little rain as in the more inward part of Africa there are few Springs But these allegations resolve not the question because we are not to demand or seek the Original of Rivers but only the Original of the Water of Fountains Therefore those that speak thus have not well considered the sence of the question as we have taken notice before although also the experience that they alledge is not general because that there are Rivers found in places where there is little rain and no snow although it be true in the Region of Peru and Aegypt which they assert Moreover rain moistneth not the Earth above ten foot deep but Fountains spring from a far greater profundity The Opinion of Seneca 2. Others suppose that we should not demand whence the water of Fountains doth arise by reason that water is an Element as much as Earth Air and Fire concerning the Original of which we do not dispute thus Seneca discourseth But other Authours cut in twain this Gordian knot with the Sword of Alexander For it is not enquired after how that water hath a Being but how it cometh to the places of Fountains and not to other places Moreover the Earth doth not so flow forward as Rivers do But for the Air it is false that we should not seek concerning it as they determine 3. Aristotelians follow the opinion of their Master See Aristotle līo 1. Chap. 11. who in the whole Eleventh Chapter of his first Book of Meteors endeavoureth to prove that the water of Fountains is generated from Air contained in the bowels of the Earth He alledgeth these reasons 1. Waters are generated from Air above the Earth viz. Rain therefore seeing that Air is in the bowels of the Earth and that there is the same cause of condensation viz. Cold therefore he saith it is absurd for any one to think that water is not produced from Air there 2. Experience testifieth that more great drops that fall are made of small ones and therefore the Original of Rivers must be as it were certain Brooks of water that meet in one part of the Earth for therefore those that make Aqueducts are wont to bring the water down by trenches and small Channels 3. Because that many Springs and those of the greatest Rivers are found in mountanous places very few in Plains or Valleys which is an evidence that the water of Fountains proceedeth from a condensed Air or Vapour which Air and Vapour tend towards higher places and mountainous places are as it were spunges incumbing over lower places Those are the reasons of Aristotle The Opinion of Cardanus 4. Cardanus with others suppose that the water of Fountains proceeds from Rivulets which are generated of watery vapours condensed both within and without the Earth but that these Fountains alone scarce make up Rivers unless assisted by rain or dissolved Snow His Reasons are these 1. If betimes in the morning one view the Mountains they will appear moist 2. Rivers overflow in the morning and so much the more by how much the part of it is more near the Fountain But the perpetual and constant impetus of the water bubling and leaping from the Springs doth not seem to have its Original from so weak and inconstant a cause Neither doth this opinion of Cardanus much differ from that of Aristotle but that Aristotle placeth Air with the generation Cardanus vapours with the generation to be the cause of Springs and indeed small is the difference between Air and vapours 5. Some of the Antients supposed Rains to be coacervated within the Earth in Cavities and thence to break forth as from a mighty belly and that all Rivers sprang from one of them or from some other of them neither that there was any other water generated but what were collected in the winter months into those receptacles they supposed to evade into the multitude of these Rivers and therefore that they flowed more in the winter than in the Summer and that some were continual and some not They added the same cause that we have laid down in the first opinion But Aristotle receiveth this opinion because that more water in one year floweth out from the mouth of the River than the bulks of that whole part of Earth or Land 6. Of Modern Philosophers many as also of the Ancients determined that the Earth again received whatsoever waters flowed out from the mouth of the Rivers into the Sea For the water of the Sea by an hidden passage went under the Earth and is beaten in its passage through divers windings of the Earth and strained through Sand and Chalk which removeth its saltness and so passeth into pure water I also defend this opinion and suppose it true yet so as not to exclude the cause laid down in the first and third place the reasons are these 1. Because more than one thousand Rivers exonerate themselves into the Sea and the greater of them in such an abundancy that that water which they send forth into the Sea throughout the whole year exceedeth the whole Earth as the River Volga into the Caspian Sea and also other Rivers Therefore it cannot otherwise be but that water must be sent forth into many places of the Earth even to the Fountains of Rivers Now if that this were not so we could not possibly imagine how that the Sea should not be augmented unto an immensity or why Fountains should not cease to send forth water Neither may it be objected that so many vapours are elevated from the Sea that are equivalent to the water that the Sea hath received from the Rivers For first only Rain maketh those vapours then again it is most false that so great a quantity of vapours should be elevated from the Sea as are generated from the water which floweth from the Rivers into the Sea Fountains the nearer the Sea are salter than those farther distant 2. This opinion is proved from that to wit that the Fountains near the Sea are salt and brackish and by how much they are nigher to the Sea by so much they are the more salt as on the Coast of Africa especially on the Coasts of Choromaudel in India where no Vines
do grow and where that all Wells are salt In the City of Suez at the Termination of the Red Sea all Wells are salt or brackish and the water two miles distant is somewhat salt So in many Islands in the Sea no Wells of fresh water are found though not so salt as the Sea water it self as in the Isle of St. Vincent and others In Peru in the low Region the Lakes are salt by reason of the vicinity of the Sea Yea in the Oriental Maritimate places the Nuts called Coco Nuts are found somewhat salt Also in the Mediterranean places themselves Fountains of salt water are found as in Lorrain Lunenburgh and the like 3. Because that it is manifest that the Sea emitteth its water through subterraneous passages from the salt Fountains of Lunenburgh where beneath the Earth those Aqueducts full of salt or Sea-water are found 4. Because that digging to a great depth as also in Mines much water is found of which neither the Rain nor the Air can be made the efficient cause How water cometh from the Sea to the places of Fountains so as to become sweet we have now shewed viz. the bottom of the Sea is not every where Rocky or Stony but in many places Sandy Muddy Gravelly Spungy drinking the water of the Sea and by a continuation of the Earth brings it by degrees to a long distance from the Sea where at length the Guttulae unite especially in a narrow space such as are Mountains and make a Fountain in the given place or Cavity but if so be that Cavity be hidden from the Earth then the water so collected either followeth another way wheresoever it be made and so a Fountain seemeth to break forth in another place which yet is not in than place but is a River derived from the former place by a subterraneous passage Or if that the water of that Cavity findeth no way about it self neither by violence can break through the Earth that covereth it then that water is not augmented but what water flowed unto it to have been its encrease that is averted to another place For that is the property of all humid bodies that all their parts and particles are moved towards that place where the deflux is made So if you fill a Vessel with water that the swelling or tumour may be above the brim of the Vessel then all the parts of the extant water have an equal inclination and power of deflux in the vicine part of the brim But yet by reason of the mutual coherence of the particles whose cause is declared in Natural Philosophy if that the deflux be made in one part of the brim all the other parts leave the vicine brim and draw to that part of the brim or they follow where the deflux is made So if you immerge a long crust of Bread into water you shall see the water born upwards and and the part of the Bread that is not immerged to be humid The Sea goeth under the Earth through Caverns Moreover the Sea goeth under the Earth through Caverns from which after the same mode the water may glide or creep forth unless you had rather ascribe it to evaporations which are carried upwards and uniting the drops in a narrow place But because there are many things which may seem to render this opinion less probable these ought also to be considered that it may be evident that they weaken not this assertion laid down Things to be noted 1. The places of Fountains are more elevated than the Superficies of the Sea by reason that most of them are in Mountanous places therefore water cannot flow from the Sea to those places because the nature of water is to move to places more depressed or less elevated as it is manifest from Rivers and the Artifices of Drainers 2. Although the bottom of the Sea be gravelly muddy and sandy so that the water may penetrate it self through its particles yet the reason doth not appear evident enough but that it may more moisten the adjoyning Earth and that which is not so high than to glide upwards to the places of Fountains seeing especially that the Earth is Rocky and Stony as in the Mountains of the Island of St. Helena 3. There is no reason why the water so gliding from the Sea should not break forth in a middle way between the Sea and the Fountain 4. In the most profound Mines none or very little water is found as Thurnheuserus witnesseth 5. This water of the Fountains should be salt because that it doth proceed from the Sea These are the chief Arguments which may seem to weaken the opinion proposed For I pass by those slight ones alledged by others Other Arguments Answered viz. that they suppose that the Sea is not sufficient to supply so many Rivers then again that Rivers then should never be diminished if that were the true cause of Rivers that we have laid down But unto these two the answer is easy because that the Sea again receiveth the water again from the Rivers that it sent forth into the Fountains Then as for the other we have shewed before that the question is not neither do we determine that all the water of the Rivers is from the Sea but only concerning the water of Springs which is not the alone cause of Rivers as we have said already and we also assert that the water of Fountains is augmented from rains and Dew because that these moistening the Earth glide or are drawn towards the places of Fountains Four Other Arguments of great concernment where the efflux of the water is made which we have explained by other Examples We come now to those four Arguments alledged which may seem to carry some weight with them The first is esteemed very valid as being taken from multiplicit experience therefore many solutions are brought and alledged by Learned men First they the most easily discharge themselves who defend the Ocean to be more high than the Earth for so they deny the assertion and they say that this Altitude of the Ocean is the cause of Springs because that Springs are less high than the water in the middle of the Ocean See Olearius his Voyage into Persia Moreover Olearius in the Description of his Voyage into Persia relateth that he ascended the Mountain that adjoyneth to the Caspian Sea and with an Astrolabe or rather a Gaeodetical Instrument to observe the Elevation of this Mountain above the superficies of that Sea but found none but that the extream superficies of that Sea was seen in the Horizontal Line yea somewhat elevated above it so that the Tumour of this Sea was found a little more high than the vertex of the Mountain on which he made his observation But in truth this solution cannot be admitted of See Chap. 13. because we have shewed in the Thirteenth Chapter that the water of the Ocean is not higher than the Mountains
not a long distance from the shoars which subsidency or sinking continued for many Ages at length caused Isles therefore in the middle of the Ocean are few Islands 1. Because that place is more remote from the shoar than that any of the eaten off parts should be carried thither 2. Because that the commotion and force of the water is greater there which moveth the earth of the Channel or rather promoteth the depth than suffereth Islands to be generated there 3. Because there are no Continents there therefore neither can troops or heaps of Islands be according to the first mode by which we have shewed such heaps of Isles to be produced yet in times past when that the middle of the Ocean was not where 't is now it is not unlikely that such Isles were here and by degrees were swallowed by the Ocean OF Absolute Geography SECT V. Containing an explication of the Atmosphere and the Winds In three Chapters CHAP. XIX Of the Atmosphere and Air. Proposition I. From the parts of the Earth as well dry as moist or from the Earth and Water vapours and fumes do continually exhale into that space which is about the Earth THE Cause is twofold first the Celestial heat of the Stars especially the Sun and Moon Of vapours and fumes The other is a Terrestrial heat or subterranean or rather terrestrial fire or which is admixed with the parts of the earth For we see that almost all bodies the least fire being moved towards them send forth a fume Seeing therefore that both the Celestial and Terrestrial heat is naught else but a certain fire therefore it is also necessary that vapours and fumes should be advanced by it from the parts of the earth So the truth of the Proposition is evidenced à priori Experience also confirmeth the same For those that travel in the night time especially when the Moon shineth and that towards the water discover many vapours to wander and be advanced about the Superficies of the earth Also it is vulgarly known that in the day the Sun doth raise many vapours also when that a mist ariseth upwards which is a certain token of rain to follow Proposition II. The Atmosphere is a space about the whole earth in which the exhalations raised from the earth are always present And it is uncertain whether that anything or body else be contained in it besides these exhalations It is also taken for the exhalations themselves about the whole earth There is no small controversie amongst modern Philosophers Of the Atmosphere concerning the body which consisteth about the earth For many Mathematicians of sound knowledge determine that there is nothing besides exhalations elevated from the earth and therefore they take the Atmosphere and Air for one and the same and immediately after the Atmosphere place the Aetherial substance But other Philosophers suppose that besides these exhalations in the space about the earth that there is a certain peculiar and simple body which they call Air although that they freely grant that exhalations may be changed into Air and contrariwise into clouds and thick vapours The same Persons after this Air even to the Lunary Orb place another subtile thin body different from the Aether which indeed they tearm Fire but they confess that it is less properly done and that it doth not agree with our fire for it is a calid substance not burning dry and very subtile not to cause the refractions of the rayes of the Sun and Stars which yet they will have to be done in this Air. Those being well considered these two opinions of the Philosophers seem rather to differ in words than in matter it self For as for the Air because that they grant it so gross that a refraction of rayes may be made in it and that it may be generated from exhalations by a light mutation the Air seemeth nothing else but a subtile exhalation although it was not exhaled from the earth As for the Sublunary Fire when that they confess that it is so improperly tearmed but they affirm that it is so tenuous that it causeth no refraction of rayes this seemeth little to differ from the Aether We affirm therefore that the Atmostphere and Air are a body about the earth on which the rayes falling are refracted laying aside the controversie whence this body hath its original which definition agreeth with the former For neither is it likely that any exhalations can be elevated from the earth so subtile that they should cause no refraction or impediment to the luminous rayes proceeding from the Aether yet if that such be granted we cannot know their Altitude and whether that they be excluded from the Atmosphere which yet if that any one will sharply urge supposing that the little fires or rayes cast from the Sun on the earth again recoil to the Sun he will not deny but that the latter definition is commodious Therefore the Atmosphere and Air are naught else but a contexture of many small bodies which adhere to the earth as a down or wool circumvesteth a Peach Proposition III. Sometimes more sometimes lesser exhalations are drawn from the earth especially in divers places Of exhalations The cause is 1. The various elevation of the Sun above the Horizon or depression beneath it 2. The diversity of the age of the Moon and its elevation above the Horizon 3. The rising and setting of the other Stars and their constitution above the Horizon 4. The diversity in the parts of the earth them selves for watery and humid places do more easily send forth vapours than earthy and dry Proposition IV. The exhalations which constitute the Atmosphere are of a divers kind especially in sundry Regions viz. watery saltish earthy sulphureous spirituous The sensible compounded exhalations or parts of the Atmosphere are divers viz. mixed of simple particles Of the exhalations which constitute the Atmosphere The cause is because that in the parts of the earth such bodies are of a divers sort and are advanced by heat some more easily and other some with greater difficulty Concerning the earthy particles some one may doubt because that those are scarcely apt to be elevated 1. By reason of the smalness of their dusts which are light seeing that gravity is an affection of compacted bodies 2. By admixture of sulphureous particles which violently carry those earthy ones with them Moreover that there are sulphureous particles in the Air is proved from the fiery Meteors Lightnings Thunder and the like yea a sulphureous odor or scent after Thunder and Lightning manifestly asserteth the same As for the watery parts we ought not to question for saline and spirituous exhalations by reason of their tenuousness are easily exhaled from the earth Little Animals generated in great number and abundance in the Air confirm the same The Aristotelians divide exhalations into two kinds to wit vapours and fumes Vapours are generated of water and easily return into the same again Fumes
proceed from dry bodies So Sal Armoniac vanisheth into smoak fire being placed under it This also is the cause that in divers Regions a different Air is discovered Also that it raineth in one place and not in another Proposition V. The least particles of the Air and those all insensible repell or reflect the rayes as a Looking-glass but some of the particles of the Air being sensible and compounded do transmit many rayes but reflect fewer others on the contrary transmit fewer rayes and reflect more Therefore the parts of the Atmosphere are divided into those that are opac and pellucid The parts of the Atmosphere these are those that transmit many rayes the former are those that transmit fewer Therefore because that the least particles both water and earth being Atoms are solid little bodies without any pores so that they transmit no rayes but repell them because that it is very probable that a perspicuity or a transmission of rayes doth require pores orderly placed in a body and empty little spaces But the parts of the Air or Atmosphere composed of little particles if that they shall have ordinate and many pores they will be perspicuous and transmit many rayes but if that those particles shall be composed or aggregated very confusedly they will transmit rayes without any pores thence it cometh to pass that the Sun discussing a thick cloudy opac Air doth make it perspicuous to wit more porous Now that the least particles reflect rayes is manifest from hence that the rayes of the Sun in a most serene Air be admitted into an obscure Chamber through a narrow hole you will see manifestly from the particles flying in a great number in the Air that the rayes are reflected to the eye as from a glass Now seeing that those particles are yet sensible the same must be concluded concerning the least particles and those that fly the sense Now those who will have humid attenuated vapours to be perspicuous but not dry ones and smoaks they are refuted by experience and reason By reason because that fumes and dry exhalations may be made equally subtile and porous as those that are watery but they suppose that perspicuity doth not consist in the mode or reason of the pores but in a peculiar quality But it is manifest by experience because that the Air is serene it hath more dry than moist particles for in that new kind of Wind-gun which is not discharged by powder or fire but by the help of wind and air the Air is so condensated that it scarcely comprehendeth the sixtieth part of the former space yet neither do they create any kind of humidity in the Gun which must altogether happen if that the particles of the serene Air were watery Proposition VI. Exhalations do not ascend of themselves and of their own nature upwards but they are forced by a violent motion or the Air is not light but heavy in a proper mode of expression Of exhalations All that is to be termed grave or heavy is moved to the Center of the Earth except that it be hindred but the Air doth that for the Earth being digged up the Air descendeth into the space made That therefore it is carried upwards is thus performed 1. That heat rarifieth it to seek a greater space 2. Because that it is forced by another vapour So in cold places as in Nova Zembla and with us in the night season no Mist ascendeth but the heat of the Sun approaching rarifieth it and causeth one part to force out and thrust forwards the other For if that those small particles of Air were free neither mutually implicated one within another then at length it would be light Proposition VII The upper parts of the Atmosphere are more subtile than the lower yet it may so come to pass that the middle parts may be more gross and condensed than the lower parts about the Earth Therefore the more light parts fly to the upper place they are more subtile and light hence the truth of the member of the former Proposition is manifest Now the cause of the latter member is that the parts in the middle Air easily counite again and so become thicker for the hot or calid Particles being carried up with them have forsaken them and the Rays refracted from the Earth in that middle Region by reason of their distance have no force Thence it cometh to pass that after Rain the middle Air is more serene because the more thick parts are separated Proposition VIII The Atmosphere or Air being heated possesseth more space than before now by how much it is more destitute of heat by so much the more it contracteth it self and occupieth the lesser space The Air being heated possesseth more space than before This is excellently shewed by that Instrument which we call a Thermometer or Weather-glass because that we measure the temperature of the Air and heat by in in hot and cold in which we discover the Air to become more condensed and to occupy lesser space in the Glass by how much the Air acquireth less heat as we shall shew in the following Proposition Now the cause of the Proportion is a priore because the calid Particles either of the Rayes of the Sun or of another fire are most subtile of all the Particles of the whole world and in continual motion Therefore those Atmospheres whilst that they are admixed separate and divide these Particles with a great force and so cause more pores and these little fires departing the Particles of the Air left to themselves unite again or are mutually complicated within themselves Corollary Therefore the Altitude of the Air or Atmosphere is not constant but decreaseth and increaseth viz. at Noon-day it ought to be greater at Midnight least about the time of the rising and setting of the Sun moderate as in Proposition XIV Proposition IX To make a Thermometer Thermoscope or Weather-glass by which we may discover the mutations of the Air in heat and cold Take a Glass of an oblong and cylindrical neck with the spherical small head L H How to make a Thermomemeter or Weather-glass let this be fixed to the Table or Board M N P Q the head being erected Let a Vessel with water be placed under the Orifice which is best to be coloured so filled that part of the pipe or neck L F may be hidden in it Now let the time of the moderate constitution of the Air or at that time at whose temperature you will compare the temperature of the Air of the other days and at that time let the water be poured into the Vessel so it will happen that the Air becoming more frigid Sec Scheme the water will ascend upwards beyond F because that the Air being condensated with cold which before filled up the space F A now possesseth less space On the contrary the Air being rendred more hot the water will descend from F towards L because that the
either more thick or subtle than the former they are refracted where they have entered at this other Medium or deflect from a strait direct course to the sides The Explication is easie from a Vulgar Experiment Let any Vessel be taken and let a ball of Gold or Copper or Gold money be affixed to the bottom then depart back from the Vessel by reason of the obstacle of the sides of the Vessel you can no longer see the Money at the bottom Then pour water into the Vessel which being done you shall see again in the former distance the Money at the bottom From hence it followeth that seeing no Ray could directly come from the Money to the eye by reason of the interposition of the sides of the Vessel and yet afterwards the water being infused the Rays arrived at the eye It followeth I say from hence that the Rays proceeding from the Money where they enter into the Air from the water do deflect or are refracted from the direct way and being so refracted they arrive at the eye It is called refraction by reason that for this cause an Oar being partly in the water doth appear refracted or broken See Scheme So let the Center of the Earth be T L the eye in the superficies let d r f p be the superficies of the Atmosphere or Air. Therefore no ray can directly arrive at the eye L because it is beneath L f g for other inferiour rays would fall in on the tumor of the Earth L o. Wherefore no Star can appear in a direct ray until it come to the Horizontal line L f g And the Stars appear before viz. whilst that they are yet beneath L g for Example in S and yet from S to the eye L no ray can directly come because that it should first fall on L o. Therefore of necessity the ray which cometh from the Star S to the eye L is not a direct but a refracted ray viz. L f which refracted ray is propogated from the incident ray S f to wit S f falling from the Aether on the more thick Medium viz. the Atmosphere in f is refracted and becometh f L when that it was direct in n And so the Star appeareth before that it could truly appear by a direct ray that is before that it arriveth at the Horizontal line L f g. So a Star being in S is not seen by the direct ray S L but by the refract r L whose incident ray is s r and direct r m and therefore the Star S appeareth higher by reason of refraction than it is and in another place it appeareth high in the Arch x g or in the Angle r l g as if it were in x when indeed it is in s For this is the nature of refractions that the rays falling from a more rarified medium on a more thick as from the Aether upon the Air they become refracted or decline towards the perpendicular drawn through the point of incidency or falling into the superficies of the incidency or medium For Example the ray S f falleth in from the Aether on the Air f is the point of the incidency T f the perpendicular drawn through f to the superficies d r f p therefore the ray S f n shall be refracted f T that of f n may be made f L. So of r m is made r L but the contrary is when that the rays proceed from the water to the Air for then they more recede from the perpendicular line drawn Lastly this also is the nature of refractions that the rays falling in perpendicularly on the superficies of another medium are not refracted but only those that fall obliquely and not perpendicularly and by so much they are the more refracted by how much they fall in the less perpendicularly or by how much the more they depart from the perpendicular So the rays S T f T H d T are not refracted because that they are perpendicular on the superficies d r f p but the rays S f S r are refracted because that they fall obliquely and indeed S f more than S r. From whence it followeth which Experience also testifieth that by how much the Stars are more near the Horizon by so much the more they refract their rays by how much the higher by so much the less And Astronomers have observed that the refraction is insensible where the Star hath attained the altitude of 20 degrees not that there is no refraction but that it is very small And for many Examples the skilful in the Opticks and later Mathematicians have derived the Rule of refraction of all Rays falling in obliquely viz. that in every medium there is one constant account between the sign of the Angle falling in and the sign of the Angle refracted to wit the Angle n f T is termed the Angle of incidency L f T the Angle refracted n f L the Angle of refraction and so in the refraction of the ray s r m. Therefore as the sign of the Angle T f n is to the sign of the Angle T f L the same is the reason of the sign of the Angle T r m to the sign of the Angle T r L. Thence it followeth that if from observation we have the quantity of refraction to the elevation of one Ray we may thence know the quantity of the refraction of all others howsoever elevated Proposition XXII The Atmosphere or Air causeth the Sun or the rest of the Stars to be seen before that they arise in the Horizon also to appear for some small space of time after that they have set also that they appear higher than they are and in another place of the Heavens as long as that they are no higher than 20 degrees The Air causeth the Sun and Stars to be seen before they arise in the Horizon We have sufficiently explained the Cause in the precedent Proposition only we shall add some Experiences or Natural Phaenomenons When that the Dutch wintered in Nova Zembla the Sun appeared to them sooner by sixteen days than it was in the Horizon that is when that it was as yet depressed beneath the Horizon about four degrees and that in a serene Air. And famous Astronomers have found it out with Tycho Brahe that in our places the Morning-sky or Air being serene we may behold the Sun elevated above the Horizon 34 minutes when that as yet he is wholy under the Horizon yet so that his limbus or skirt doth enlighten the Horizon And the Sun seemeth to arise when that as yet he is depressed about 34 minutes beneath the Horizon to wit the Air of the place where we are being serene So the Spica Virginis a bright Star seemeth to rise to us when that yet he is depressed 32 minutes beneath the Horizon which is thence collected because is seemeth to arise when the Cauda Leonis is 34 degrees 30 minutes high and in the same quarter in which this Star of the
sign which shall be that of the Angle m r T from which if that you take away T r f the refraction m r L demanded is left The Ancient Opticks used another far more intricate but yet a more false method Proposition XXXIV The Altitude and Rule of Refractions of the Air being given to find the refraction at the given apparent altitude of the Star and thence the true Altitude Of Refractions This is the same with the former Because in the former from the given refraction at the given Altitude that rule of Refraction was to be found Examples for Exercise may be taken from the Table laid down before Of the Reflection of Light in the Air. Proposition XXXV The Rays of the Sun and Moon having entred the Air or Atmosphere are not only refracted but are also reflected or repercussed from the particles of the Air as from a rough Looking-glass by reason of the inordinate scituation of the particles Of the Rays of the Sun For except the Rays of the Sun were reflected from the particles to our eyes no part of the Air would appear lucid unto us except that above which the Sun is and so the Sun being in the Oriental part neither the Meridian or Occidental Air would be lucid Therefore some rays being refracted pass through by the Atmosphere some are refracted here and there with many reflections from one particle unto another and so they make the Air luminous or light Proposition XXXVI The reflection of the rays of the Sun from the particles of the Air is the chief cause of the Twilight that is of the light before the rising and after the setting of the Sun Chief cause of Twilight is the reflection of the Rays of the Sun from the particles of the Air. It is manifest from the precedent Proposition for as the Sun being in the East his rays being ejaculated to the West do reflect to our eyes and so make the Occidental part conspicuous so the Sun being beneath the Horizon his rays sent forth into our Air are reflected to our Eyes and to the Occident and from the Occident to our Eyes Proposition XXXVII The beginning of the scituation of the Morning Twilight that is the Oriental Air is illuminated and is so beheld the Sun being depressed about 18 degrees beneath the Horizon and the end of the Evening Twilight that is no more illumination appeareth in the Occidental Air is when the Sun is depressed 18 degrees beneath the Occidental Horizon Of the Morning Twilight This Proposition dependeth on Experience and Observation for if in the Morning season that is after the first and second hour after Midnight we diligently observe our Eyes being turned towards the East when that any bright colour sheweth it self in the Oriental Air about the Horizon and that we know at that time the hour and minute of the hour we may thence know the depression of the Sun beneath the Horizon Now we understand a serene Air of which seeing that there is or may be a great difference thence it cometh to pass that some do extend the Twilight to the twentieth degree of the depression of the Sun beneath the Horizon others unto the sixteenth for by how much the Air is more thick by so much the less will the light of the Twilight be discovered contrary unto what we said may happen in refraction Proposition XXXVIII The Altitude of the Air or matter may be found from the quantity of the Twilight which by reflection createth the light of the Twilight as hitherto they have thought neither doth the beginning of the Twilight arise from a simple but at least from a double reflection See Scheme Let T L h be the Earth g f o m the bound of the Air L the place of the Earth in which the Twilight appeareth or the light in the Horizontal Air f the incident Solary ray f g s. Therefore Mathematicians that have hitherto written concerning Twilights say that the ray incident on f which maketh the reflection f L to come from the very Sun S and because that no ray can come from the Sun to f so long as the Sun is beneath the Tangent f h s for Example in S then its ray may come to f first or because that they will have reflection to be made from f as from an hollow Looking-glass therefore T f h ought to be equal to the Angle T f L wherefore because that the Sun is found depressed 18 degrees beneath the Horizon therefore the Angle n f s shall be found 18 degrees and L f h 162 and T f h or T f L 81 degrees and L T f 9 deg whence T f is found about 874 German miles and the altitude of the Air 11 miles as Clavius and Nonius make it Alhacen and Vitellio make it 13 miles This so great an altitude of the Air must in no sort be granted when that other Phaenomenons do repugn Now that it is found so great according to that method that happeneth from a false hypothesis that they assume viz. the ray g h f which maketh the reflected f L to come from the very Sun for this is false because that it cometh by reflection from another ray for Example g L. Now that to make the small light in f it is not necessary that the ray f g should come from the vâ—ry Sun but another reflected ray may do the same is proved from thence that in the Occidental Air we behold the light before the rising of the Sun when yet it is certain that no direct ray then cometh from the Sun S to the Occidental Air m but from another point of the Air for Example from f and o and so the reflected ray L m proceedeth from the incident ray f m which very f m is reflected from the incident g f and this g f from another g L which perchance also cometh from another Secondly that also is worthy of note That they have determined that reflection is caused from the Air as from an hollow Looking-glass the Center of whose cavity is T viz. the same with that of the Earth for this also is false for the rays are reflected from the particles of the Air no regard being had to the Center of the Earth but according to the superficies of those particles this is manifest from the ray L m which slideth from the Occidental Air m to T for if that it came from M as from the hollow-glass of the Center T its incident ought to come from the quarter x but now it cometh from o or between f and o therefore the ray L m is so reflected from the particle m as the figure of it required And there are in the Air particles of a most different figure and therefore it is no wonder if that divers reflections are here and there caused into all quarters Proposition XXXIX It being supposed that the light of the Twilight is not generated by a
simple but by a double reflection to find thence the altitude of the Air which may more agree with other Observations See Scheme In the former Proposition it is said that that ray g h f which maketh the first reflection f L in the beginning of the Twilight cometh not from the Sun it self but that it is also reflected in g let therefore his incident be g l which may touch the Earth in p for so L g is the first ray that can come to g and this we place to come now immediately from the Sun it self yet by reason of refractions it may a little deviate viz. let Q L be the very ray it self of the Sun l p g the refract g h x the reflex f L the second reflex The altitude of the Air T x is to be found out because that therefore the ray g l x is the refract of the incident Q L let us suppose the refraction to be made 30 minutes viz. the Angle Q l x moreover the Center of the Sun to be 17 degrees beneath the Horizon when that the Twilight beginneth therefore the Limbus of the Sun Q which shall be distant beneath the Horizon 16 deg 45 min. and 30 min. being taken away by reason of refraction the Angle n K x 16 deg 15 min. shall be the refracted depression of the Limbus of the Sun beneath the Horizon And moreover because that K L K p are equal and also f L g p therefore Kg Kf are also equal and the Angle K f g is equal to the Angle K g f. Now both of them taken together are equal to the Angle n K g 16 degrees 15 minutes wherefore K f g is 8 degrees 7 minutes and f T L is 4 degrees and T f L 86 minutes whence is found that T f 86 ½ miles And therefore the altitude of the Air is found 1 ½ mile which is far lesser than the Mathematicians formerly deduced from the Twilight and it will yet be found far lesser if that a threefold reflection be placed to make the beginning of the Twilight which is not impossible and this twofold or threefold reflection is more rightly admitted of for the cause of the duration of the Twilight than that which Kepler alledgeth concerning the splendid matter in the vicinity of the Sun See the other things concerning the time of the Twilight and variation of Longitude in the second part of this Book Proposition XL. To find out the Altitude of the Clouds by a Geodetical dimension By a Geodetical dimension to find out the Altitude of the Clouds The Air being serene and quiet let any point or little Cloud more observable than the rest be taken and measure the altitude of this as the top of an high Tower from two stations so that at the same time one Observer may be in one station and the other in another so you shall find the altitude of this Cloud which is never found to exceed a quarter of a mile Proposition XLI To suppute the quantity of the Air its altitude being given This is nothing else but to suppute the space between the Earth and the outward superficies of the Air which is easie if so be that we know the altitude of the Air For let the solidity of the Sphere be supputed whose Semidiameter is composed of the Semidiameter of the Earth and the Altitude of the Air and from the found out solidity let the solidity of the Earth be taken away that which is left is the solidity or quantity of the Air. Proposition XLII The Air in some places hath some things peculiar Of Rains In Aegypt it seldom or neraineth So in Aegypt it very seldom Raineth or rather not at all and if at any time a light Rain falleth Catarrhs distempers of the Lungs Feavers and other Diseases do follow The inundation of Nilus and almost a quotidian Erost in the Morning do supply the stead of Rains So in Peru Rains are never seen Also in Peru. In many places under the Aequator it raineth for an whole half year and in the other half it is fair See in the Second Part Chapter the 26th The Island Puton Timor is for the most part covered with Clouds and Frost The Air of Sumatra In the Island of Sumatra the Air is very heavy and cloudy by reason of many standing Pools The like is in many other places so in Old Mexico also in Malacea and the like The Isle of St. Thomas lying under the Aequator St. Thomas is reputed to have the most unwholsom Air of all Regions although that it abound in all Fruits In the Province of Chili the Air is so subtile Chili that a Sword sheathed in its Scabbard without any wiping yet receiveth no rust Isles of the Azores In the Isles of the Azores the Air and Wind is so sharp that it eateth plates of Iron and the Walls covered with the same in a short space and reduceth them to dust Aristotle relateth that on Mount Olympus there is no motion of Air yea no Air at all if that that be true which followeth and that Characters written in the Dust are found there after many years without any disturbance and that those that ascend that Mountain cannot continue their lives except that they carry moistned Sponges with them by the help of which they breath In America when that the Spaniards passed through from Nicaragua into Peru on the tops of the Mountains interposed many suddenly died or were frozen to death with their Horses like unto Statues even unto the return of those that escaped Some think that a defect of Air was the cause but that is not probable Neither do I receive that for truth which Aristotle writeth concerning Mount Olympus because the contrary is found in higher Mountains whose tops are covered with Snow Whence we formerly conclude that they are not above the Air but that the Air floweth over them Busbequius an Eye-witness declareth See the Chapter of Mountains The Authors relation of the Mountain Carpathus in Hangaria that Mount Olympus in the Summer is also covered with Snow About the Isles of the Indian Ocean the Air is fragrant with the scent of the Odours especially at that time when that Aromaticks are mature Mariners discover this scent when that as yet they are three or four miles distant from these Isles viz. when that a Wind contrary to their course bloweth The Air of the Sea is more heavy than that of the Land and less acceptable unto those that are not accustomed unto it the difference is manifestly discerned when that Mariners approach near the shoar for by the distance of an whole mile they will discover how nigh the Land they are by the very Air. Mariners relate this especially concerning Soffala which is scituated in the Oriental Coast of Africa When that I had printed these I hapned by chance on a certain Observation made by David Froelichius
intermedial Winds so that there were 12 winds every one of which they designed by their proper terms although that some others reckon otherwise The Latins besides these twelve added the names of twelve more which blow between two of the former twelve the following Diagram sheweth their appellations and order in which the Greek winds are noted by Greater letters and those which the Romans have interposed between every two are noted by Lesser letters yet Seneca noteth that this inconveniency was long since observed by Varro and that therefore he ordered these twelve VVinds thus that every two should be distant by equal distances not having any regard of the rising of the Solary quarter but in that Seneca affirmeth that there are no more VVinds than twelve is false and ridiculous for they are infinite Proposition IX Hitherto we have explained the distribution of the Winds taken from the quarters and have also shewed that both the divisions of the Ancient Grecians and Romans is less adapted to the use of Navigation and Geography Therefore we deservedly retain the more recent distributions which constitute 32 Winds blowing from quarters equally distant Now those are called Opposite Winds or contrary which blow from quarters diametrically opposite For we conceive the Winds as coming from another place to our place but we suppose a quarter to be extended from our place to another place Proposition X. The Causes of the Winds are various for seeing that the Wind is nothing else but a continued protraction of the Air all those things which are able to effect such a protrusion will be the causes of Winds Now they are these The Causes of the Winds are various 1. The chief and general cause is the Sun it self which attenuateth and rarefieth the Air by his fiery beams especially that on which he sendeth forth his perpendicular rays or over which he standeth for the Air being rarefied requireth far more space Thence it cometh to pass that the Air being forced by the Sun doth protrude the vicine Air with a great force and when that the Sun is moved round from the East into the West the chief force of the Air caused by him is towards the West And a sign of it may be that in many places of the torrid Zone and every where in the Sea a continual Easterly wind doth blow viz. the Sun thrusteth forwards the Air from the East towards the West and exceedeth not the torrid Zone Indeed the rarefied Air is thrust forwards circularly towards all the quarters North East South West but yet it is not admitted in all quarters But the more vehement protrusion is towards the West because that the Sun moveth towards that quarter therefore the wind is almost continually more sensible in the torrid Zone towards this quarter But in our Zone for many days in the Morning before the rising of the Sun and after that where for the most part other Winds do cease Of other quarters some are sometimes more disposed than others to receive this force therefore where the protrusion becometh greater towards the North the South Wind is said to blow when that it is thrust towards the East then the West Wind bloweth when towards the South the North and so for other quarters And it is to be noted that when this protrusion is made to any quarter lying without those four Cardinal Quarters then in divers Regions a diverse Wind shall be seen For although that that quarter be one in respect of the place unto which the Sun is vertical yet in respect of other places it is diverse and so the same cause maketh the same Wind to be termed by divers names in several Regions Now this cause is either assisted or hindred by other causes if that it be assisted it maketh the Wind vehement if it he hindred it maketh it less vehement from that quarter and oftentimes another Wind then bloweth which is rather assisted by that general cause 2. I make the second cause of the Winds and that more frequently Exhalations elevated copiously and with a violence from the Sea and Land but they scarce cause any Winds except that when they begin to be rarefied 3. The attenuation and rarefaction of the Clouds and Mists whether that it be caused by the Sun or from other Stars or whether from included or adjoyned fires or sulphureous particles 4. The dissolving of Snow and Ice especially of that which lieth on Mountainous places and are not wholly dissolved into water 5. The various scituation and rising of the Moon and the other Stars 6. The condensation and rarefaction of the Air and Vapours by any heat or cold 7. The descent of the Clouds by which the subjected Air is pressed The consideration of the Aeolopila conduceth much to the more easie understanding of these causes into which the water included fire being put to it by an arrow orifice sendeth forth the winds with a great force until that all the water be exhaled Now these retain the place of a narrow orifice in the Air 1. The more dense circumstantial Air. 2. If that the same vicine Air be forced by or prohibited to give place by other Vapours or Mists 3. If that the Air be more condensed towards one quarter and so layeth open a way to Blasts Proposition XI Why the Winds blow so that they make a perpendicular line over the Horizon or why the going forth of the Winds is perpendicular to the Horizon The Winds so blow that they make a perpendicular â—ine over the Horizon The cause is by reason that the Air in a Spherical figure doth encompass the Earth and the protrusion of the Air is made for the most part through the greatest circle of the Sphere which passeth through the Center of the Earth for although we may suppose the Air to be forced according to a transverse line yet because that there is a lesser force from the sides and greater resistance thence it cometh to pass that the winds incumb into the midst of the passage But we shall more commodiously conceive this mode if that we do but consider the first cause of the winds for the Sun thrusts forwards the Air towards all the quarters of that place unto which it is vertical but that force is not received in all as I have said If that now we consider the great Circles drawn from that place and amongst these those in which the Air is thrust forwards all those places of the Earth seated in this circle or semicircle shall find the wind falling down perpendicularly by reason that every great Circle of the Earth passing through any place of it is perpendicular to the Horizon of that place The same is the reason if that at any time the wind breaketh forth from a thick Fog or dissolved Clouds but those places that are scituated without these Circles feel not the wind although that the Air be moved above their Horizon because that it is not perpendicular to that
or force in and therefore a general Wind is considered especially in the midst of the Sea most remote from the Land 2. Yet another wind may also blow in the midst of the Sea viz. if that in another a Cloud or other cause generating of a wind be very great From these two Causes it happeneth that a general wind is less or more constant or continual in divers placer Now the general winds are only found in the Sea of the torrid Zone or that which lieth between the Tropicks about the whole Earth yet in some places it extendeth it self without the Tropicks the space of 7 degrees and they are called Eastern that is the East-wind or collateral to the East as the South-East North-East viz. which blow from the East towards the West for the whole year But they do not consist with the like constancy in all the parts of that Sea but in some they are more hindred and in some less They are more constant in the Pacifick Ocean viz. in that part of it which lieth between the Tropicks so that Ships that loose from the Port of Aquapulco in New Spain in America towards the Philippin Isles that is such as steer their course from the East to the West oftentimes for 60 degrees Sail continually without any alteration or furling of the Sail with a constant East or North-East wind neither unto this day hath any Ship in that most long Voyage of 1650 miles been cast away Whence the Mariners say that they may sleep securely in this Voyage neither is there any need of guiding the Ship seeing that the general Wind bringeth the Ship to the wished Port for here other winds do impede the general Wind. The same constancy of this same Easterly wind is found in the Sea from the Cape or Promontory of Good-hope in the bounds of Africa or rather from that procurrent part of Africa which lieth in the Torrid Zone even to Brazil in the midst of which Voyage lieth the Isle of St. Helena unto which Mariners returning from India unto Europe are wont to direct their Course The Isle of St. Helena is distant from the Promontory of Good-hope 350 Miles and is oftentimes accomplished in sixteen days or also in twelve as the general wind is either vehement or slack for in this there is not a perpetual likeness the Sea-men using the same security when that they have first sailed to the Parallel of that Island for the Promontory of Good-hope lieth without the Tropicks which we have said that they use who Sail in the Pacifick Ocean from Aquapulco to the Philippins yea when that they have passed the Promontory of Good-hope they judge themselves to have escaped all danger and variation of the winds and sleep securely the wind constantly filling their Sails towards that Island and Brazil But yet this only is their great care that they may not Sail beyond the Island seeing that it is a very small one for if that they have passed it the eighth part of a mile they cannot regain it viz. an Easterly wind forcing them towards the West therefore then they are forced with great loss of their Voyage to make to the Coasts of Brazil or the other Isle called Ascension to water at If then you demand by what course they Sail when that the Ships make a contrary Voyage in this Sea viz. whilst that they steer from the Philippin Isles unto New Spain or from Brazil and the Isle of St. Helena unto the Promontory of Good-hope whilst that they Sail from India in these Voyages the Reader must know that Mariners use a threefold mode for either they navigate the Sea scituated without the Tropicks therefore they do not touch at the Isle of St. Helena whilst that they Sail from Europe into India or where necessarily they must pass by this they do not directly steer their course from the West to the East but obliquely from the North the Collateral quarter of it to the South or the Collateral quarter of it or lastly they choose such a time of Navigation in which they know that that general wind is impeded often by others But this latter because that it happeneth rarely therefore they rather make choice of the two former Modes of which we sâ—ll speak more in the Chapter of Navigation Therefore there are two Seas of the Torrid Zone in which that general Oriental wind with its Collaterals reigneth throughout the whole year viz. that which lieth between the procurrent of Africa and Brazil the other is that which is extended between New Spain or rather between America and the Oriental Islands of which the Philippins are a part The third part of this Sea under the Torrid Zone viz. between the Procurrent of Africa and the Philippins or Oriental Islands is not indeed destitute of this general wind but oftentimes it is hindred in this Sea by reason of the frequency of Islands which hindrance yet in some places is more frequent than in other some Between Mozambique and India the general wind is of most force in January February March April in other Months other winds do blow of which we shall speak in the following Proposition This general wind is more hindred in the Sea of the Indian Isles At the Isle of Banda in the Month of May the Oriental winds begin to be prevalent being very violent and accompanied with rain at Malacca in September and in other places otherwise as we shall shew in the following Proposition See Proposition 3. Yet this you must know that this general wind doth not equally extend it self in these Seas towards the Tropicks in all parts but that there is a great difference in this For the Tropicks are distant from the Aequator on both sides 23 ½ deg but the general wind may be discovered in one Meridian unto the Latitude of 20 degrees in another Meridian unto 15 in another unto 12. So in the Indian Ocean when in the Months of February and January the East wind or South or South-East bloweth it is not discovered until you come to the 15 degree of Latitude So unto those that Sail from Goa unto the Promontory of Good-hope here a general wind meeteth them at the 12 deg of South Latitude and at the 28 degree of the same Latitude accompanieth them So also Mariners have observed that no general wind bloweth between the 4. degree of Northern Latitude even unto the 10 or 11 deg between Africa and America for when they have Sailed by that wind from St. Helena towards the Aequator even unto the 4 deg of Northern Latitude then are they destitute of that wind even until they come unto the 10 degree of Latitude And from that degree even unto the 30 the North-East is again manifestly found continually to blow although that the 30 degrees be 7 degree from the Torrid Zone Yet notwithstanding in the 6 7 and 8. degree of Parallel Latitude it also bloweth in some places but in
Indians Orancan It is often in the Oriental Sea especially in the Sea of Sian China and Japan between Malacca and Japan This violently breaking almost from the Western quarter and being whirled about the Horizon with a rapid course perfects its circumference by continual increase in the space of twenty hours raising those vast Seas with an horrid violence and swellings the Billows beating one another take away all hope of safety from the Mariners and so both by reason of these Typhons and also other Storms sailing from India to Japan is very dangerous so that it is accounted an happy Voyage if that one Ship of three keepeth its course At the Autumnal Season a most furious Typhon doth especially predominate and that often with so great violence that those that have not seen it can hardly believe it so that it is no wonder that some mighty Ships have been weakned by those great Waves you would think in this Storm that Heaven and Earth would meet Neither doth it only rage on the Sea but also on the Shoars and overwhelmeth many Houses and throweth up huge Trees by the roots and forceth great Ships from the Sea on the Land for about a quarter of a mile The Mariners term it a Wind that runneth round the Compass In the Indian Ocean it seldom continueth above six hours and maketh the Sea so level at the first as if that it were plained but on a sudden horrible Waves do follow So about the City Ardibil in Persia in June and July every day when that the Sun is at his Meridian height a Whirlwind ariseth for an hour by which a great dust is raised Questionless the cause of a Typhon is that a wind breaking forth with violence from some one quarter towards another findeth an obstruction in this and therefore is wreathed and turned into it self as we see that if water be suddenly moved if that an obstacle be put in its way it moveth in a round suddenly and with a force It may be that a Typhon may arise from opposite winds blowing together violently which render the superficies of the Sea so plain and comprehend the Ships in the middle If that it rush from above it is called Caetegis and then it maketh the Sea so plain as if that it had been plained but presently mighty Floods or Waves arise Proposition XIII Whether that some Winds break forth from the Earth or Water Of VVinds breaking forth from the Earth or VVater We easily apprehend that this may easily be seeing that Cavities are here and also Winds Sulphureous substances and Moisture Now nothing hinders but that a gust sufficiently vehement may be there generated viz. if that it be any thing hindred as it is procreated to go forth or if that it be presently generated in a great quantity as much as the winds require If that the Outlet be hindred an Earthquake is generated or a wind with a violent force maketh wey for it self and thrusts forwards the Earth So oftentimes a Smoak breaketh forth from the Earth in the Isles of Maarice so also from some Caves In Japan is a Fountain breaking forth at certain hours of the day with great noise Yet I do not remember that I have read of any Wind breaking forth out of the Sea Proposition XIV Whether that a certain Wind may arise from the flowing of the Sea and of the Rivers Of a VVind that floweth from the Sea and Rivers Experienced testifieth that in those places where the flux and reflux of the Sea is discovered if at any time the Air be free from other winds from the most part with the water flowing from the Sea a wind also bloweth from the Sea Therefore it seemeth probable that the Air by reason of the contiguity is carried with the water to the same quarter But this should be more diligently observed Whether when that the Air is still the same wind is discovered with the afflux of the Sea I think yet that another cause of this Wind may be given viz. that the Air is forced from the place by the flowing water Now the Air is much moved at a very little impression so they will have the Air moved with the Rivers that run swiftly Proposition XV. Why Ignes fatui Castor and Pollux and Helena are amongst Tempests The Portugals call them Corpo Santo the Spaniards St. Elmo Now not only one but many are oftentimes beheld in Ships at the Masts wandring with an uncertain motion as other Ignes fatui although that sometimes they may seem to fix on the Sails and Masts But sometimes leaping up and down they appear like a flame or a Candle burning obscurely If that four such vicine Lights be seen the Portugals term them Cora de Nostra Seneora the Crown of our Blessed Lady or Virgin Mary And these they account of as a most certain sign of the Tempests to cease The cause of those Fires is a Sulphureous part full of Bitumen forced downwards through that great motion of the Air and forced or fired into one by agitation or congregation So we see by agitation that the Butter of Milk is separated from this Phaenomenon is also collected that for the most part those violent Tempests proceed from a Sulphureous spirit rarefying and moving the Clouds Proposition XVI Why there is so frequent a Calm in the Sea near Guinee and under the Aequator in the Atlantick Ocean between America and Africa Frequent ' Calms in the Atlantick Ocean This is one of the Phaenomenons about Winds of no small difficulty That at Guinee which is two degrees from the Aequator and under the Aequator is almost a perpetual Calm especially in April May and June where no motions are found there when that no such thing is observed in other parts of the Ocean scituate under the Aequator Indeed an Ecnephias is sometimes sufficiently frequent there but this also is desired oftentimes by the Sea-men because that by the force of frequent Ecnephiae they endeavour to sail beyond the Aequator For it happeneth very often that Ships sailing from Europe to India are detained a whole Month at the Aequator before that they can pass it Now especially they avoid the Coasts of Guinee and the Calm there and therefore with some hindrance to their Voyage they sail towards Brazil yea some Ships are detained here for three Months before that they can depart from the Coasts into the Mid-Sea I have not yet found out the cause of the Phaenomenon unless perchance this be it that Snows are found intercepted in no Mountains of Africa between Guinee and Barbary which may generate the Winds Proposition XVII In some Regions the Tempests are Anniversary Of Tempests Anniversary in some Regions We have given some Examples of these in our former Propositions viz. 1. Concerning the mutation of Motions 2. Concerning our Ecnephias 3. Concerning a Typhon 4. At the Promontory of Good-hope in June and July 5. In the Isle
again opposite four days of the year in two of which the Sun shall obtain a middle distance from the place given if therefore the place given be North take two of those four days whereof one happeneth between the 21 of December and the 21 of March this shall be the entrance of the Spring the other between the 21 of September and the 21 of December this shall be the entrance of Autumn But if the place given be South from those four days you must take the day between the 21 of June and the 21 of September for the entrance of the Spring and for the beginning of Autumn that which happeneth between the 21 of March and the 21 of June The beginning of Winter shall be the 21 of June if the place be South but if North the 21 of December 3. If the place given be between the Aequator and the eighth degree of Latitude it shall have two Summers and two Spring seasons besides Autumn and Winter except peradventure we will cast away that second Spring which is intermedial between the two Summers as we said in the end of the preceeding Proposition and attribute a continual Summer to that time which if you do we must act no otherwise with the given place than in the former Mode If we will attribute two Summers and two Springs to it as the definitions of Summer and Spring accurately observed do require we shall first act by the first Mode as in the former Theorems viz. we shall find the entrance of Summer and Winter and except the four days of moderate distance found in the Table of those four those two which we advised to take in the former Mode for the entrance of the Spring and Autumn here again we shall take on the same conditions but of the other two days that only which is proximate to the day of the Summer shall be taken For this will shew the end of the Summer and the beginning of the second Spring but for the day of the second Summer another day of the three remaining shall be taken in that Area from which the beginning of the first Summer was taken viz. that which is distant by an equal number of days from the 21 of June and the 21 of Capricorn if the place be South the first day of the Summer So the days shall be found in which the Summer the Spring Autumn and the Winter do begin and end in the places of the Torrid Stone Proposition V. In the places in the temperate and frigid Zones the four seasons of the year are almost equal or consist of an equal number of days But in the places of the Torrid Zone they are unequal Neither are only the times of the divers seasons unequal but also the time of the season in the divers places of the Zones is unequal The seasons of the year in the places in the Temperate and Frigid Zone are equal 1. For the places of the temperate and frigid Zones what I have said is easily demonstrated For seeing that the Sun in every time of those four quarters of the Year runs through three Signs therefore the times of the Spring Summer Autumn and the Winter shall be equal or of equal days except some days viz. five in which the Summer and four in which the Spring of the Northern places exceed the Autumn and the Winter but in the Southern places it is otherwise for Autumn and Winter exceed the Spring and Summer which as we have shewed before proceedeth from the excentricity of the Sun 2. In places lying under the Aequator there are two Summers as also other Seasons but hoth short as also both the Springs viz. each Summer and each Spring hath only 32 days which is 64 days but the Autumns and Winters are longer viz. 55 days which is 110 days 3. In the places of the Torrid Zone by how much the less they are remote from the Aequator by so much the more they have the longer Summer the less Winter and more or less moderate Autumn and Spring for in places not remote above 10 degrees from the Aequator the Summer continueth six Months Now the greatness of the Summer Autumn Winter and Spring is known by the preceeding Proposition What hath hitherto been said is only to be understood concerning the Celestial Seasons that is those which depend on a Celestial Cause or from the access or recess of the Sun for from this alone cometh not light heat and cold as we have said in some places before therefore we shall consider the other causes in the following Propositions Proposition VI. In places of the Tornid Zone as the Sun by day is very near the Vertex so on the contrary by night he is beneath the Horizon Of the Motion of the Sun in places of the Torrid Frigid and Temperate Zones and very much removed from the Vertex of those places so that those places by night lye almost in the middle shadow of the Earth neither can the Air possibly any wayes be warmed by the Suns rayes by frequent reflection In places of the Frigid Zone as the Sun by day is not very nigh the Vertex so by night he doth not profoundly remain beneath the Horizon but for the greatest part of the night doth so turn round beneath the Horizon that many rayes from him by reflection do penetrate into the Air. In places of the Temperate Zone as the Sun by day cometh to the Vertex of those places by a moderate Vicinity so by night by an easie distance he is depressed beneath the Horizon so that some rayes at least are in the Air. To shew this by the Globe first let the Pole be elevated for some place scituated in the Torrid Zone or rather let the Pole be placed in the Horizon it self that the places of the Aequator may be in the Vertex of the Horizon or that the wooden Horizon may become the Horizon of the places of the Aequator then consider the depression of the Parallels which the Sun describeth by his circumrotation beneath the Horizon and the truth of the member of this Proposition will appear Then let the Pole be elevated for the places of the Frigid Zone or let the Poles be placed in the Vertex of the Horizon and the Parallels of the Sun beneath the Horizon from the first degree of Libra to the first of Aries being considered it will again be manifest that they are very little depressed below the Horizon And so we have shewed the second member or part of this Proposition Lastly let the Pole be elevated for the Latitude of any place scituated in the Temperate Zone and the depression of the Parallels beneath the Horizon again being considered the third part of this Proposition will be proved Proposition VII A place being given in the Globe and the day of the year to find the Longitude of the Crepusculum or Twilight in the place given at the day given That time is
termed the Longitude of the Twilight in which either before the rising of the Sun or after his setting some light is discovered in the Air. For the finding the Longitude of the Twilight by the Globe of any place and day of the year For the finding out of the quantity of this time we must suppose that which is observed by Astronomers as we have said in the nineteenth Chapter that the morning twilight beginneth for the most part if the Air be serene the Sun drawing nigh to the eighteenth degree of depression beneath the Horizon and the evening endeth when the Sun hath come to that degree of depression Let therefore the Pole be elevated for the Latitude of the place given and let the place of the Sun in the Ecliptick being found from the day of the year be sought in the Ecliptick of the Globe and let his opposite point be noted then let the Quadrant be applied to the Vertex and the point noted be found to the Horizon the Index to the twelfth hour of the Cycle then let the Globe be turned round until the noted point be elevated 18 degrees above the Horizon which is known by the help of the Quadrant for so shall the place of the Sun be depressed so many degrees beneath the Horizon and the Index in the Cycle shall shew how many hours or parts of an hour the serenity of the Air being laid down the twilight continueth that day in the place given It is convenient by three examples to learn the use of this Problem choosing a place for one of the Torrid Zone another of the Temperate and a third of the Frigid Zone Proposition VIII In places of the Torrid Zone the twilights are small very long in those of the Frigid and moderate in those of the Temperate Zone Of the difference of the Twilights in the several Zones For in places of the Aequator and those near the Crepusculum according to the Hypothesis laid down in the former Proposition is of about one hour which yet experience testifieth is only half an hour or little more because the more thick and gross Air is not so high there as is required to make the twilight to the 18 degree of depression both also because the Hypothesis of the 18 degree is to be taken concerning very small light with which the twilight beginneth such as yet is not accounted by the Vulgar for a twilight In the Frigid Zone the twilights continue for many days when the Sun remaineth beneath their Horizon In the Temperate Zone it continueth 3 4 5 and 6 hours and in some places all night and in the days of the Summer according as the places are more or less nigh the Frigid Zone All these are proved by the Mode proposed in the precedent Proposition Proposition IX A place being given in the Temperate or Frigid Zone and another in the Torrid Zone and moreover the day of the year being given to find out the hour of the place of the Torrid Zone in which hour the Sun may have the Altitude above the Horizon of that place and so strike that place with his rayes equally elevated as great as it hath in the place of the Temperate Zone in the Meridies it self Let the Pole be elevated for the Latitude of the place of the Temperate or Frigid Zone and let the place of the Sun found from the day given be brought to the Meridian and the Altitude of it reckoned for this is the Altitude of the rayes heating that place and illustrating it in the Meridies Then let the Pole be elevated for the Latitude of the place given in the Torrid Zone let the Quadrant be applied to the Vertex and let the degree of Altitude before found out be noted in it let the place of the Sun be brought to the Meridian the Index to the twelfth hour of the Cycle then let both the Globe and the Quadrant be moved till the place of the Sun agree with the noted degree of the Quadrant for so the Sun shall have the same Altitude above the Horizon of this place as it is in the Meridies of the former The Index will shew the hour demanded in the Cycle therefore this hour and the rayes of the Sun illustrating and beating of the place and Air of the Torrid Zone are as equally elevated over the Horizon of it as the rayes in the Meridies of the former place it thence followeth that the same heat will be in the Torrid Zone at the hour found out as in the place of the Temperate Zone in the Meridies except other causes intercede Some hinderances viz. first that the Sun in the foregoing days hath introduced some one or other calid Constitution to the place and the Air of the Torrid Zone and not such and so great in the places of the Temperate or Frigid Zone Then secondly that the Sun straitly ascending towards the Meridian above the Horizon of the places of the Torrid Zone sendeth forth all his rayes to the place as in one plain and to one plaga and therefore causeth greater heat than in the Temperate or Frigid Zone where the Sun moveth obliquely from the Horizon to the Meridian and sends forth his rayes from one and another plaga therefore the rayes are not contracted into a place so narrow nor do they continually heat For example let us seek in what hour of the day in places being under the very Aequator on the day of the Aequinoctials the Sun will have that Altitude as he hath at Amstelodame on the Meridies of the same day Proposition X. How the causes of light heat and of the seasons which we have reckoned up in the first Proposition of this Chapter have themselves in the Torrid Zone and how to shew them Of the seasont light and heat in the Torrid Zone and how they are shewed First every day of the year ascendeth directly above the Horizon of those places especially of the Aequator towards the Meridian and the Vertex of them and therefore about the ninth hour of Forenoon he heginneth to ejaculate to those places rayes about 40 degrees declining from the perpendicular rayes which rectitude of the rayes or perpendicular of the rayes augmenteth towards the Meridies and again decreasing continueth to the fourth hour after the Meridies or Noonstead where the Sun departing towards the Occidental Horizon beginneth to send forth his rayes more obliquely to those places therefore the greatest heat in those places ought to be from about the ninth hour before Noon even to the third or fourth after Noon if that this cause be only regarded but yet because the Sun now departs from the Vertex of those places and sometimes approacheth nearer therefore the Winter of every one of those places shall be when the Sun goeth from the points of the Ecliptick much remote from those places that is from the first degree of Cancer or Capricorn towards the points having a middle
are under the 52 degree of South Latitude yet they have no very hot Summer So that the Hollanders in the month of January when there should be an hot Summer found a great glade of Ice in the Creek of one of their Seas In the Mountains of the adjacent Coasts Snow is discovered all the Summer long and it is observed that in almost all the Regions of the South Temperate Zone they have a Cold far more intense in Winter and a violency of Rain and a less heat in Summer than the parts of our Northern Temperate Zone Whether this be the cause that the Sun makes a longer stay and the slower progress in the Semicircle of the Northern Zodiac than in the Southern is to be questioned In the Neighbouring Province of Peru which they call La Valla Imperial in the Province of Potosi they find so great a Cold that for four miles circumference there groweth nothing The season of Chili In the Kingdom of Chili which extendeth it self from 30 degrees of South Latitude to 50 degrees the Spring beginneth in the months of August sooner than the Celestial Account admitteth and endeth in the middle of November And from the middle of November Summer beginneth even to the middle of February from whence Autumn leadeth on to the middle of May which the Winter succedeth which is very violent and dispoileth the Trees of their Blossoms and scattereth a deep Snow with a vehement Frost which yet is discovered by the Sun except which is very seldom that the Sun appeareth not but the Snow rarely falleth in the Vallies for although it falls in great abundance and is heaped up so high that it ascends the tops of Mountains and is heaped together in the vacuity of the Mountains as in so many wells and indure almost the whole year yet being there dissolved they flow into the Rivers and Torrents which run through the Vallies with a great force even to the Sea to the great enrichment of the Grounds But although here it Snow not except rarely in the Plains yet it maketh so excessive a Frost that the like is scarcely felt in many parts of Europe which happeneth partly from the Altitude of the Pole partly from the propinquity of the Mountains from which descend so subtile and penetrating Winds that sometimes they are unsufferable whence it cometh to pass that the Maritim parts are more temperate He that is Studious may collect other differences of Region under the same Climate or in the vicine Climates from Writers for example that in England the Air is not so cold as in Holland so that they pen not up their Heards in the Winter Betwen Siberia and Tartaria in a place seated not far from the Frigid Zone in the end of our Temperate are said to be plesant Fields and rich Pastures almost no cold seeing that they scarce feel Winter where by the command of the Duke of Moscovia the City Tooru is built which is at this day so much encreased that it is able to repell the Assaults of the Tartars The Island of Japan In Japan the Winter is Cold Snowy Ruiny when yet other Regions of Europe and Asia lying under the same Climate have far lesser Winter the cause is because that Japan consists of many Islands disjoyned by a small Euripus and that it also lyeth in the middle of the Ocean America very hot in the Summer In Armenia and the adjoyning places there is great heat in Summer because it lieth amongst Mountains here and there mixed with Fields hence the more rich in some places in Summer remove to the tops of the Mountains and remain there for some months but the meaner sort in the day time defend themselves in the Mountains from the near and about eventide do descend to the lower ground Proposition XIII To declare how in places in the Frigid Zone the four Seasons of the year have themselves with the light Of the places in the Frigid Zone The cause of those Seasons with the light proposed in the entrance of this Chapter thus stands in the Frigid Zone 1. The Center of the Sun for some days or months as the place is either nearer or remote from the Pole doth not arise above the Horizon and for so many days setteth not 2. In those days when he is above the Horizon he only illustrateth those places with his oblique raies because he is not much elevated above the Horizon but moveth round it because those places are over much removed from the way of the Sun 3. The Sun is not deeply depressed beneath the Horizon yea in places near the Polary Circle or Artick Pole although the Center of the Sun doth not arise yet part of his Skirt ariseth and is beheld for some days above the Horizon before the Center it self ariseth by reason that the half Sun possesseth 15 minutes in the Heaven For example let us take those places whose distance is from the Aequator 67 degrees towards the Pole Artick let the Pole be elevated according to this Latitude and in the Meridian Crena of the Horizon you shall see that the degrees of the Ecliptick do not arise from the 19th degree of Sagittarius to the 11 of Capricorn that is the Center of the Sun being in that Arch doth not arise for 24 days viz. from the 10th of December to the 4th of January and yet part of the Skirt of the Sun for that whole time shall be above the Horizon to wit on the 21 of December the Limbus glittereth the Horizon but on the 10 of December as also on the first of January half the Sun shall be above the Horizon and half beneath because the Center is then in the Horizon But the whole Sun shall be elevated above the Horizon when the Center of the Sun shall hold the 14 degree of Capricorn that is about the 4 day of January also the whole shall afterwards appear when his Center shall possess the 16 degree of Sagittarius that is about the 7 of December But in places where the elevation of the Pole is 70 or 75 degrees there this difference between the Oriental Limbus and the Oriental Center is very little so that the Limbus or Skirt scarcely anticipateth the rise of the Center of the Sun one day or half a day From this smallest of depression it followeth also that they enjoy the light of the Crepusculum many hours before the rising and after the setting of the Sun and although the Sun ariseth not yet in all or many of the hours of the day they have light in the Air. There is also another cause See Chap. 19. which maketh the Sun first to be seen before that he is elevated above the Horizon For thence it cometh to pass that not only the Sun is seen before he is elevated above the Horizon and before the Raies can directly come from him to the Eye but also that the light of the Twilight sooner illustrateth
the Air than it would do without this refraction We shall anon alledge an example of the appearancy of the Sun proceeding from refraction 4. The Full Moon and near the Full remaineth above the Horizon for many days when the Sun is depressed beneath it viz. for so many more days by how much that place is more near the Pole Yet it is not so highly elevated above the Horizon as to cause any warmness But the Full Moon in those months in which the Sun remaineth above the Horizon in an whole revolution the Full Moon is never above the Horizon The Planets not always the same above Horizon 5. The Fixed Stars are almost the same always above the Horizon but not the Planets For Saturn remaineth 15 years above the Horizon of the place near the Pole and 15 beneath the same Jupiter 6 years beneath and 6 above the same Horizon Mars 1 year Venus and Mercury about half a year From this cause it is likely that there is great diversity of the motions of the Air and seasons in divers years 6. The Land in most places of the Frigid Zone is Stony Rocky and as hard as Flint in few places Chalky Sulphureous and Fat In these places there is a moderate fertility in the other a sterility 7. Those Regions are incompassed with the Sea but for the Mediterranian we as yet have no certain account 8. Some of the Regions of the Frigid Zone have Mountains of a moderate hight but most want them running on a plain for a long space 9. The cold Winds there frequently blow from the Polary Plaga seldom the East Wind and least of all the West In the cold Artick Plaga the North Winds rage in the Antartick the South 10. Clouds and Rains frequently perplex these Regions From these causes it is not difficult to collect what the condition of the seasons in these Regions are for in the Winter time when the Sun riseth not for whole daies it cannot otherwise be but that for the most part thick Clouds Frost and Cold must render the Land uninhabitable They are not altogether deprived of light for that time for the Moon being above the Horizon for a long time giveth light and the twilight is daily afforded from the Sun to the Vicine Horizon But the Snow the stick close about the Earth which cannot be discussed by the heat of the Sun and therefore hinder the aspect of remote things There is no fertility but all barren and uncultivated for that which some suppose by how much any Region is nearer to the Pole by so much less it feeleth the intenseness of the cold and the Fields are found more fertil seemeth not probable to me when neither in Nova Zembla which is distant 16 degrees from the Pole nor in Spitzbirga which is only 8 degrees distant such a constitution of the Earth is found but a roughness and hardness and almost in the middle of Summer Snows or at least Showers and very cold Winds Neither is their opinion helped by one example observed by Mariners in a certain Region 9 degrees distant from the Pole which most men suppose to be Groenland For in this green Grass is found and an Air more warm than in Nova Zembla as is most certain The only Animals peculiar to these Northern Regions Rhinoceros a kind of Venison is the Rhinoceros and this in the space of a month becometh exceeding fat by feeding on this grass Nevertheless seeing that as yet not many Regions are hitherto found of this temperature in the Frigid Zone it is not expedient for us from this single example to make a general conjecture especially seeing that the cause of this peculiar constitution is manifest for that Land is full of Marshes and Sedgey and the grass by which the Rhinoceros or Dear are tendred so fat is not a kind of Terrestrial Grass but Sedge and Osiers but other Herbs are not there found or any Trees From whence we may gather that that Land containeth some fat and Sulphureous Substance which being mixed which the water produceth such an Oyle and fattening Sedge but that the like Earth is to be found in other parts of the Frigid Zone hath not as yet been observed but rather the contrary Therefore in the Winter in these places is little light but an incredible and great violence of Cold Snow Showers and Polary Winds And this Winter beginneth in the Northern Frigid Zone when the Sun first entreth Capricorn although also the Autumn the Sun going from the 1 degree of Libra to the 1 of Capricorn be little different from this violent Winter The Spring indeed is less infested with this violence of the Air yet it is without Snows Showers and cold Polary Winds Yet the increase of heat in the day or rather the decrease of cold is discovered at that time viz. the Sun going from the 1 degree of Aries to the 1 of Cancer And in this Vernal season or in the latter days of it the Sun continueth above the Horizon in intire revolutions and therefore then there is discovered a moderate heat which yet is not of that force as to melt and dissolve the Snow of all those places into Water much less is it able to melt the Ice whence Marriners report that here is to be found Snow and Ice of a perpetual duration Then the Summer shall be from the going of the Sun from the 1 degree of Cancer to the 1 of Libra in the first part of which the Sun yet remaineth for whole daies above the Horizon and augmenteth the heat by some accession so that June July and August are months of a tolerable Air. In some places among the Mountains the heat of the Sun is intense but the Showers and Clouds do much hinder this benignity of the Sun and especially the most sharp Northern Winds unto which sometimes Snow is adjoyned so that no fruits or Corn can here arrive to any maturity except in some places near the Artick Circle CHAP. XXVII Of the Shadows which the bodies erected in the Earth and illuminated by the Sun do cast and of the division of the Earth arising from thence SEeing that the Shadows in divers places of the Earth which the illuminated bodies of the Sun do cast are carryed into divers places and falling on the Sense have much variety hence it came to pass that men who were ignorant of this cause were struck with an admiration and in respect of the Shadows of the Earth divided the Inhabitants of the Earth as it were into three sorts which division must be applyed to the places of the Earth or to its Superficies So that they termed some Amphiscij others Heteroscij and the rest Periscij The explication of which terms seeing that they contain but small learning we shall say somewhat also concerning Shadows which although they do not pertain to Geography yet by reason of their near affinity they may be proposed in this Chapter Of
the Shore and in the Harbours as also greater Ships come to Zeland than to Holland Proposition V. If a Ship be so burdened that its weight or gravity be almost equal to the weight or gravity of the Sea water equal to the capacity of the Ship yet it sinketh not in the Sea but when it shall be brought into any Rivers it sinketh to the bottom The reason is because the Water of Rivers is lighter than the Water of the Sea Therefore if the weight of the laden Ship be almost equal to the gravity of the Marine Water therefore it shall be greater than the gravity of River Water and so the Ship shall be sunk in the River or carried to the bottom Many Ships for this reason have perished which have been over laden by unskilful Mariners or not unburdened in the Mouths of the Rivers Now how much this gravity should be is known from the proportion of the Sea Water to River Water Proposition VI. Any body swiming on the water hath that weight that the watery Moles hath equal to the demergent part of this body Corollary The part of the Ship being given which is under Water the weight of the whole burdened Ship may be found For the gravity of the Water is known or is easy to be found For Example one Cubick foot of Water is 70 li. and therefore if the part of the Ship under Water be 2000 Cubick foot therefore the gravity of the Watery Moles which is equal to the part of the Ship under Water shall be 140000 li. So much also shall be the weight of the Ship laded Proposition VII A Ship is most commonly accounted commodiously to carry that quantity of burden whose gravity is equal to the gravity of half the Moles of water which the Ship can contain For Example if the Ship can carry 500000 Tun of Water whereof every one is accounted at 2000 li. weight that is if it contain the Water of 1000000000 li. You may conveniently lade it with the burden of 250000 Tuns 1000000000. In this sense you must understand it when they say that Ships are so many Tuns or carry so many Lasts The Spanish Carracts carry 1200 Lasts the greatest Holland Indian Ship 800 Lasts Proposition VIII By how much the Weight of the Ship laded is greater by so much the less it is tossed with storms and tempests A laded Ship is not so subject to be tossed in Tempests as when not laden Ships of 2000 Tuns are not in danger of those Tempests which are vexatious to Ships of 300 or 500 Tuns Much more might be said but this may suffice for Elements CHAP. XXXVII Of the third and chief Part of the Nautick Aâ—t viz. the Art of Guiding or Navigating of a Ship and its subdivision of the Four Parts Proposition I. That is termed the Art of Guiding or Navigating of a Ship which teacheth unto what quarters a Ship is to be Guided in any scituation of it in the Sea that it may come to the purposed place without danger I Make Four Parts of it Of the Guiding or Steering of Ships 1. Special Geography that is the knowledge of a space intercepted between two places and the properties of the same 2. The knowledge of the quarters in every place 3. The cognition of the Line by which the Ship is to be brought from one place to the other for there are between every two places infinite intercepted Lines this part is termed Histriodromice 4. The knowledge of the scituation of every place unto which by Sailing we arrive or how these places are scituated unto that place unto which the Ship is to be directed This is the chief part of the Art of Sailing Proposition II. The cognition of the intermedial space comprehendeth these things Things observed from Special Geography and Nautical Maps 1. The scituations of the places the procurrences of Angles the bending of the Shores the aspect of Promontories Mountains Bays the depths of Waters the sight of Islands and Coasts of Lands All which are known from Special Geography and Nautical Maps but most easily and with greatest certainty from observation and frequent Navigation through any tract of Land which is the only Cause that some Mariners are more fit to guide a Ship to such place and others to another 2. The knowledge of the General and Special Winds and those that are peculiar unto any place which is exceeding necessary in Navigations which are undertaken in the Torrid Zone and adjacent places For here a general Wind and in many places Anniversary Winds which we have shewed to be called Moussons Motions in our XX. Chapter do rule which either promote or hinder Navigation For the Indian Sea is Sailed by these Anniversary Winds Of these and also of storms and tempests we have spoken in the XX. Chapter See Chap. 20. 3. The Condition of the Motion of the Seas in every tract also the quarter of it into which quarter the Sea and Waves are born for they carry the Ship with them The diversity of those Motions in many places we have shewed in the XVII Chap. See Chap. 17. First of all there is required a knowledge of the Ship and reflux of the Sea and the time or hour of the increase and decrease at every day the supputation of which is termed the reckoning of the Tides for except a Master know this the Ship is often much hazarded when it is near Shores or Sands whereof most in the greatest increase of the Water do not hinder the passage of the Ship but most do in the decrease So with a flux the Navigation is more facile to the Shore and to the inlets of Rivers and the contrary is discovered in the reflux Of the supputation of this time we have spoken a little in the Proposition of the XVII Chapter CHAP. XXXVIII Of the knowledge of places viz. the North South East and West and the intermedial quarters Proposition I. In every place to know the Plagas viz. the North South East and West and the intermedial quarters The quarters very neccessary in Navigation THe knowledge of this is the most necessary of all the Problems of the whole Art of Navigation seeing that a Ship must be guided unto some quarter which if unknown there can be no direction and the very defect of this knowledge alone hindred the Navigation of the Ancients and in this is the chief difference between the Ancient and Modern Navigation For the Ancients had not a Method by which at any time in the large Ocean they might know where was the North where the South and the other quarters Therefore they could not nor durst they commit themselves to the vast Ocean but only coasted the Shores so that they might know the quarters from other signs The Ancients had a double Method of finding out the quarters The Ancients had a double Method which serveth also to the Modern Navigation of finding out the quarters
mark with a Chalk Then let the shank applied to the quarter be moved until the other noted point of the shank applied to the quarter fall in on the Parallel of the observed Latitude For the point of the falling in is the place sought viz. the place of the Ship But if that there be no Parallel of Latitude observed on the Map let the degrees intercepted between this Latitude and the vicine Parallel be taken by the interval of the Compass on the lateral line And let the Rule in the line of the quarter and one Foot of the Compass be moved together in this Parallel until the other Foot of the Compass and the noted shank do meet the point of the meeting sheweth the place of the Ship Seamen use two pair of Compasses If that you will determine more accurately by the Calculation of the place demanded on the Map or Earth it self the Problem is this The Latitude and Longitude of one place being given and the quarter in which the Navigation is appointed to another place and the Latitude of this place given to find his Longitude for the Latitude and Longitude given is the place it self 3. The quantity of the Voyage performed from one known place to another unknown being observed and the Latitude of this other being observed to find this other on the Maps Let the quantity of the Voyage performed be taken by the interval of the Compass from the opposite Scale Then if a Parallel through the degree of Latitude be observed on the Map let one Foot of the Compass be placed on the noted place the other Foot on this Parallel This point shall be the place demanded But if the Parallel pass not through the degree of Latitude let one shank of the Rule be applied to the vicine Parallel on the other shank let the degree of Latitude be noted and let the Rule be moved until the other Foot of the Compass toucheth the noted point of the Rule The place of the Map subject to the point in this scituation shall be the sought for place of the Ship If that a more accurate invention is required by Calculation the Problem shall be this The Latitude and Longitude of one place being given and the distance of the other on the line of Navigation and the Latitude of this to find out the Latitude of this other For this being known when the Latitude is observed you have the scituation of the place it self on the Maps or Earth The 4th or 5th Method also of finding out of this place is also given viz. in which the Longitude of the other or sought for place is supposed to be observed but the Latitude is unknown But because that very seldom the Longitude can be observed on the Sea therefore this Method is omitted as unuseful See Snellius Stevens and Metius He that desireth more concerning this Method let him Read Snellius Stevens Metius and others that have treated at large of it Proposition III. To conjecture unto what quarter the Ship is moved and in what Rhombe although the signs be fallacious In the solution of the former Proposition for the finding out the place of a Ship those things as noted were taken and observed 1. The quarter unto which the Ship is moved and the Rhombe in which 2. The way made 3. The Latitude of the place unto which it hath arrived Now therefore we must shew how these three may be observed on the Sea that they may be used for the finding out of the place For if that these be not rightly known or observed the true place shall neither be found or discovered First therefore let us see concerning the quarter of the course of the Ship and the Rhombe The Pilots know the quarter from the Compass or Loadstone The Pilots know the quarter from the Compass or Loadstone For what quarter or Rhombe of the Compass agreeth with the Line of the conceived Longitude of the Ship the same is put into the quarter of the Ship to be moved and to describe its Rhombe For they seldom use the sign taken from the quarter of the apparent rising and setting of the Sun which they compute These signs may be corrupted by divers Causes so that they may deceive in shewing the Rhombe or quarter 1. If that the Declination of the Magnetick Needle be uncertain in that place and therefore the quarters of the Compass do not shew the true quarters 2. If that the Sea in that place hath a flux to a certain place for it will carry the Ship from the true Rhombe although the Ship be directed unto the same quarter the fluxes and refluxes are the frequent cause of this error And in many places of the Torrid Zone a general Motion is of force and in many places a stated and fixed Motion from stated winds 3. Winds especially storms remove the Ship from the Rhombe of their Voyage although they ply in the same quarter 4. The fluxes of the Sea which are carried towards other quarters and carry the Ship with it 5. The Rudder or Helme cannot be moved by him that steereth unto any quarter as it ought to be the waves of the Sea obstructing of it All these hinder the Ship to be moved in the same Rhombe whose quarters are shewed by the Compass But how much it is drawn aside must be learned by conjecture from the vehemency of the Flood and of its quarter and the like but the Method is very imperfect Proposition IV. To cast up the Voyage made upon the Rhombe to measure it at the given time from the given place The casting up the Voyage made upon the Rhombe c. Pilots conjecture the same 1. When they observe or know by experience what course a Ship is wont to make with such a Wind. 2. If that they have Sailed in the same Meridian or vicine Line with any Wind and have observed the Latitude of the place in the beginning of the Motion and the Latitude of the place in the following time For the difference of Latitude turned into miles sheweth the course made for so long a space of time and such a Wind. Whence for the time given and such a Wind continuing the course made is collected 3. With more industry they measure the course performed by a Boat and string one end of which is fastened to the Boat and the other with the Globe is in the Ship for the Ship remaining immovable Sailing is permitted to the Boat untill it be removed 10 or 12 Orgyas of the string and the time elapsed between is observed And from this for any time of the performed course of the Ship is found out The signs of the performed Sailing of the Ship are corrupted and rendred uncertain by divers ways yea are uncertain of themselves seeing they are mere conjectures 1. Oftentimes the Ship maketh lesser or greater way than the conjecture affordeth viz. because in many places of the Sea the flux is
Ebuisa of about 150 miles in circuit whose chief place is so called and its Port is Magno The chief Commodity which it affordeth is Salt of which here is made a great quantity And about ten miles from this Isle is the other called PORMENTERA Isle of Pormentara which is about fifty miles in circuit The People are excellent Swimmers as well the Women as the Men. The Air of the whole Country of Spain is generally good and healthful and the Soil fertil enough were it well cultivated but the thinness of its Inhabitants since their setling in America is the chief cause thereof The whole Country is Catholick It hath 11 Archbishops 56 Bishops 20 or 25000 Parishes and abundance of very rich Abbeys and Monasteries Chief Rivers in Spain In Spain are five great Rivers viz. the Douro the Tagus or Tago the Guadiana the Guadalquiver and the Ebro or Iborus The Douro is esteemed for force the Tagus for its renown the Guadalquiver for its riches the Ebro for its name and the Guadiana not having wherewith to answer the others for shame hides it self under ground Chief Hills in Spain The chief Hills in Spain are Seir Morena being a chain of Hills declining from the midst of Spain towards the Streights of Gibraltar and upon these Hills it was that Cervantes the Wit of Spain made the Scene of the many Warlike exploits atchieved by the flower of Knight Errantry Don Quixot de la Manche 2. Inbalda or Idubalda which extends it self from the Pyreniae towards Portugal And 3. Seira Nevada which from East to West crosses Granada and are very high Hills ITALY ought to be considered in three or four principal Parts which shall be those of LOMBARDY which may be divided into the Higher where are the Estates of PIEDMONT which belongs to the Dutchy of SAVOY and comprehends the Dutchy of Aost Aoste Signieury of Verceil Verceili Principality of Piedmont Turine County of Ast Astr Marquisate of Saluce Saluzzo County of Nice Nizza or Nice MILLAIN which comprehendeth the Dutchy of Millan Millan Lake of Como Como Lodesan Lodi Cremonese Cremona Pavese Pavia Tortonese Tortona Alexandrin Alexandria Laumelline Valenca Novarese Novara GENES or GENOA which is divided in The Eastern River Getroa Sarzana The Western River Savona Arbengue Vintimiglia MONTFERRAT To the Duke of Mantoua Alba. To the Duke of Savoy Trin. Lower where are the Estates of The REPUBLICK of VENICE which possesseth the Provinces or Parts of Bergamase Bergarne Cremase Crema Bressan Brescello Veronois Verona Vicentin or Vicentinois Vizenzo Padouan Padoua Polâ—sâ—ne de Rovigo Rovigo Coast of Trevisane Trevigi Feltrâ—n Feltri Bellâ—nois Belluno Cadorin Cadore Friouli Cuidad de Austria Aquileja Palma la Nova Istriâ— Cabo d'Itria Dogâ—do or Dutchy of Venice MANTOA Dukedom of Mantoua Mantoua PARMA and PLACENZA Dukedom of Parma Parma Dukedom of Placenza Placenza MODENA and REGGE Dukedom of Modena Modena Dukedom of Regge Reglo or Regge TRENT Bishoprick and County of Trent In the one and the other Lombardy are divers small Estates among the which is Mirandola ITALY particularly so called where are The Estates of the CHURCH Towards the Gulph of Venice as Dukedom of Ferrarese Ferrara Bolognois Bologna Romandiola Ravenna Dutchy of Urbin Urbin Coast of Ancone Ancona Towards the Tyrrhenian Sea as County of Citti di Castello Perusin Perugia Ombria or the Dutchy of Spoleto Orvietin Orvieto Terre Sabine Narvi St. Peters Patrimony Veij Campagna di Roma Rome or Roma Among the Estates of the Church are Dutchy of Castro Castro Republick of St. Marino The Estates of TOSCANY To the Great DUKE of TOSCANY Florence Florence Sanase or Siennois Sienâ— Pisan Pisa Livourne or Ligorne To divers Princes as the Republick of Lucque Principality of Alassa Signieury of Piombine Isle of Elbe Cosmopoli The Kingdom of NAPLES sometime divided in TERRA di LAVARO CALABRIA But at present into twelve Provinces whereof are Six towards the Tyrrhenean Sea to wit Terra di Lavora Naples Cajeta Principato citra or Interiour Amalfi Salerno Principato ultra or Exteriour Benevento Conza Calabria citra Cosenza Calabria ultra Regium Basilicate Cirenza Six towards the Gulph of Venice to wit Terra di Otranto Otranto Brundufium Gallipoli Brindici Tetra di Bari Bari Capitanate or Pugi Manfredonia Mont St. Angelo County of Molise Abruzzo citra or Interiour Lanciano Sulmona Civita di Chietti Abruzzo ultra or Exteriour Civita di Penna Aquila PUGIA ABRUZZO And to which for the fourth part may be added The Isles and Kingdoms of SICILE or SICILY Messina Palermo Siracusa Montreale and Cataliâ— SARDAGNE or SARDINIA Cagliari Bosa and Sassari CORCE or CORSICA Bastia Mariana and Calvi Together with several small Isles as those of Naples Liguria c. some of which are taken notice of in the Descriptional part The Estates of the DUKE of SAVOY are On this side the ALPES to wit The DUTCHY of SAVOY where there are the Provinces of Genevois Annecy la Roche Alby Thonnon Vieux Faussigni Cluse Bonneville Bonne Sallanche Taninge Chablais Thonon Evian St. Gingot Savoy Chambery les Eschelles Montmelian Ayguebelle Conflans Beaufort Ugine Miolans Aix and Rumilly Tarentaise Monftiers St. Jaqu ' Esme le bourg St. Morice Morienne St. Jaan de Morienne la Chaâ—obre Modane Laâ—â—ebourg And Beugey in part Yenne St. Genis d'Hoste The COUNTY of NICE where are the Vicarats of Nice or Nizza Nice or Nizza Ville Franche Poget Poget Barcellonnette Barcellonnette le Lauset Sospelle Sospelle Saorgiz And the Val St. Esteve St. Esteve St. Salvador Counte of Boglio or of Beuil Beyond the ALPES to wit PIEDMONT under the name of which is understood the Dutchy of Aoste Aoste Castillion Bard. Marquisate of Yvree Yvree Pont St. Martin Signiory of Verceil Verceilli Crescerâ—tin Borzane Biele Andorne Gartintra Marquisate of Suze Suze Avillarâ—e Principality of Piedmont Turin or Turino Mondouj Fossan Chivas Rivoli Javen Carignan Pancalier Vigon Cavours Ville franque Raconis Savillan Coni Tende Ceve Cortemille Bene Quierase Quiers Moncalier Cocconas Verue Counte of Ast Asti Ville neuved ' Ast Saluce or Saluzzo Marquisate of Saluce Carmagnole Barges Revel Droners Cental Rocqu ' Esparviere Demont Quarter of Piedmont or at present belonging to Fracne Pignerol Perouse Lucerne Brigueras The DUTCHY of MONFERAT On the Coast of GENES In part where are Albe Trin and Aqui. The Marquisate of Oneglia Marro In PIEDMONT restored from the Church the Printipality of Masseran The DUTCHY of SAVOY preteneth to Geneve Chypre c. LOMBARDY which may be divided into the Higher and comprehendeth the Estates of PIEDMONT as it belongs to the Duke of Savoy where are the Dutchy of Aost Aoste Ivree Seignieury of Verceili Verceili Principality of Piedmont Turin Fossan Mondevi or Mondoui Suze Savillan Coni Quierase Quiers County of Ast Asti Marquisate of Saluce Saluce or Saluzzo Carmagnole County of Nice Nizza or Nice Barcelonnette MILLAN as it belongs to the Catholick King where are the Dutchy of Millan Millain Val