than another To discover and compare the Changes of the Temperature of the Air made by Winds strong or weak Frosty Snowy and other Weather To compare the Temperature of differing Houses and differing Rooms in the same House To observe in a Chamber the Effects of the Presence or Absence of Fire in a Chimney or Stove To keep a Chamber at the same Degree or assigned Degree of Driness SECT XII The Eighteenth Chapter shews the Efficacy 〈◊〉 the Air 's Moisture in contracting Ropes … elling of Timber and bursting of Marca … s. SECT XIII The Nineteenth Chapter contains an Account of some unheeded Causes of the Insalubrity and Salubrity of the Air under the following Propositions I. That it seems probable that in divers Places the Salubrity or Insalubrity of the Air considered in General may be in good part due to the subterraneal Expirations especially those called Ordinary Emissions II. It is probable that in divers Places some Endemical Diseases do chiefly or partly depend on Subterraneal Steams III. It is likely that divers Epidemical Diseases are in great part produced by Subterraneal Effluvia IV. It is probable that most of the Diseases that Physicians call New ones are caused either chiefly or concurrently by Subterraneal Steams SECT XIV The Twentieth and Twenty first Chapters shew That there are several Latent Qualities in the Air which arise from the Union and Conjunction of other Bodies with it some of which may possibly be raised by the Heat of the Sun Beams and also That the Air seems to contain in it all sorts of Seminal Principles SECT XV. The Twenty second Chapter contains an Endeavour to Improve Artificial Magnets And the Twenty third and fourth Chapters shew That Magnetical Qualities depend on a Mechanical Construction of the Constituent Parts of a Body since that Quality may be altered by the Effects of Fire and other Concurrent Accidents which can only Mechanically affect it SECT XVI The Twenty fifth Chapter proves by several Experiments That Electricity may be Mechanically produced or destroyed SECT XVII The Twenty sixth Chapter contains a General History of the Air in which since nothing is contained but what is Historical it is not possible to relate the Substance in less room than it is there contained CHAP. IV. SECT I. THE First Chapter of the Fourth Book proves That Tastes may be Mechanically produced SECT II. The Second and Third Chapters prove That Odours and Colours depend on a Mechanical Texture of the Body endowed with them SECT III. The Fourth Chapter contains an Experimental History of Colours from whence it appears That Diversity of Colours frequently denote different Properties in Bodies and that the Perception of Colours depends on a particular Motion given to the Spirits in the Retina and communicated to the Brain As for the Cause of Colours it depends on the various and differently modified Superficies of Bodies or the various Figures of the superficial Parts and their Situation and sometimes the Motion of a Body by which it is enabled to reflect the Rays of Light variously to the Eye As to Particular Colours in the Fifth Chapter we are told That Whiteness depends on such a Superficial Texture as reflects the Rays of Light not upon one another but upon the Spectator's Eye by reflecting them without Refraction and that the Surfaces of White Bodies are Specular and by a Change of the Texture of its Parts a Body may be deprived of that Colour Blackness differs from White in as much as the Rays of Light are reflected inwards and not upon the Eye the Pratuberant Parts yielding to the Impression of those Lucid Rays The Sixth and Seventh Chapters contains several Experiments which prove That Whiteness and Blackness may be Mechanically altered or produced CHAP. V. SECT I. IN the First Chapter of the Appendix to the Fourth Book he teaches That Cold may be Mechanically produced or destroyed by a bare Change of Texture or Alterations otherwise Mechanically brought on without the Assistance of the Aristotelian substantial Forms or the Hypostatical Principles of the Chymists SECT II. Shews us That not only Weather-Glasses but our Senses may misinform us about Cold and the account of several Predispositions and the Temper of our Sensories as we feel it colder in the Air when we come out of a hot Bath than when only out of a warm Room c. SECT III. The Third Chapter contains Observations about the Deficiencies of Weather-Glasses c. which since they teach us only how to learn to improve the use of them and since they cannot be expressed in fewer Words I must take no farther notice of them SECT IV. Tells us That the Cause of the Condensation of the Air in Weather-Glasses and the Ascent of Water by Cold depend on the Pressure of the external Air gravitating upon the Surface of the Water without the Pipe and over-powering the Spring of the Internal Air weakened by Cold. SECT V. The Fifth Chapter contains a Natural History of Cold which since it will not admit of being otherwise related than Historically I must refer the Reader to the Epitomy SECT VI. The Sixth Chapter contains a Confutation of the Received Notion of Antiperistasis The Seventh an Examination of Mr. Hobbe's Doctrine of Cold which being only Controversial I must pass it by And as for the Eighth and Ninth Chapters they likewise containing bare Historical Truths which admit of no Contraction and this small General Recapitulation will not admit of Transcribing the whole Epitomy SECT VII The Tenth Chapter teaches us that Cold is only a Privative Quality depending on a Privation of the Motion of the Parts of a Body cooled SECT VIII The Eleventh Chapter shews That the Expansive Force of freezing Water is so great as to be able when froze in a Brass Cilinder to raise 254 Pounds tho' the Cilinder was none of the largest And in the same Chapter we are likewise told That a cold Ebullition or if one may so speak Effervescence depends purely upon the Texture of the fermenting Liquor SECT IX The Twelfth Chapter contains several Experiments which prove That Heat depends upon and is caused by a variously determined and a rapid Motion of this minute Parts of the Body esteemed hot SECT X. Contains an Account of a particular sort of Mercury which grows hot with Gold SECT XI From several Experiments made and contained in the Fourteenth Chapter it appears That the Particles of Fire may be detained in Metal and by that means add to the Weight of it And the Fifteenth Chapter contains Experiments which have the same Tendency SECT XII The Sixteenth Chapter contains a Discovery of the Perviousness of Glass to ponderable Parts of Flame and also proves That Flame may act as a Menstruum and make Coalitions with the Bodies it works upon SECT XIII The Seventeenth Chapter contains new Experiments concerning the Relation betwixt Flame and Air from which it appears that it is very difficult to produce Flame without Air
Virtue of Catharticks be increased or diminished or even totally destroyed by a strong continual Cold. 13. Whether Harts-Horns thawed will give the same Quantity of Spirits by the same Method of Distilling which they use to yield when not frozen 14. What Cold operates in the Fermentations of Liquors 15. Whether Birds and wild Beasts grow white there in Winter-time and recover their Native Colour in Summer 16. Whether Colours may be concentred by Cold e. g. a strong Decoction of Cochineal in a fit Glass 17. Whether the Electrical Virtue of Amber and the Attractive Force of the Magnet be changed by a vehement Cold. 28. Whether Pieces of Iron and Steel even thick ones be made brittle by intense Frosts and therefore Smiths are obliged for Prevention to give their Iron and Steel Tools a softer Temper 19. Whether accurate Observations evince That all Fishes die in frozen Waters if the Ice be not broken where it is diligently to be enquired into Whether the Cold it self or the want of Changing or Ventilating the Water or the Privation of Air be the Cause of the Death of Fishes 20. Whether any skilful Anatomist has enquired by Freezing to Death some Animals as Rabbets Pullets Dogs Cats c. after what manner it is that intense Cold kills Men whether they have found Ice in the inward Parts as the Brain and Heart and in the greater Vessels Enquiries into Hungary and Transilvania 1. What is observable in Hungary Transilvania and the neigh bouring Parts as to Minerals Springs Warm Bath Earths Quarries Metals c. 2. Particularly to enquire into the several sorts of Antimony or Antimony Ore to be found in Hungary and to inform us of the several Places whence they are digged to the End they may be sent for 3. To enquire where the best Hungarian Vitriol is to be found and the Cinnabaris Nativa 4. To give us a right Account of the right Gold and Silver Earth-Ore said to be found at Cranach in Hungary whence the Gold is called Cranach Gold first lighted upon by the Care of the Emperor Rudolphus and chimically wrought by his Order and Inspection 5. To enquire and send over some of that kind of Vitriol which by credible Persons is affirmed to be found Crystallized in Transilvania as also after the Vitriol said to yield Gold 6. To inform us of the Salt-Pits in Transilvania said to yield two sorts of perfect Salt the one being a Sal Gemmae the other a common Table-Salt to observe how deep these Salt-Mines lie from the Surface of the Ground how deep they are digged hitherto and what Damps are met with in them 7. To enquire after the Veins of Gold and Quicksilver at Cremnitz in Hungary and the Vein of Silver at Schemnitz in the same Kingdom 8. To enquire whether the Waters of the Thermae that pass by Schemnitz depose a certain Sediment which in time turns into a yellow Stone 9. Whether in the Mines of Gold Silver Copper Iron Lead in Hungary there be generally found Quick-silver and Sulphur 10. Whether it be true That in the Copper-Mines of the Place called Herren-Ground in Hungary there be found no Quicksilver at all 11. Whether it be true That in some Parts of the Vpper-Hungary the Ores of Copper Iron and Lead be sometimes so commixed that there is often found in the upper of the Concrete Matter of Iron in the midst Matter of Copper and in the lowermost Lead and that in other Parts of the Country Copperish Fluors are mixed with Leaden ones 12. Whether it be true what Athanasius Kircher writes from Relation That the Ductus of Metals do sometimes run North and South and sometimes cross-ways 13. Whether it is true what Busbequius reports Of a River in Hungary whose Water is so hot and yet so full of Fish that he saith one would expect that all the Fish drawn thence would come out boil'd 14. Whether there be Springs about Buda or Alba Regalis that rise at the bottom of the River so hot that those who go to bathe dare not put their Feet so low as the Sand for fear of having them parboil'd 15. Whether there be in Hungary an Avernus that exhaleth always such poisonous Steams that Birds flying over it do oftentime fall down either stupified or quite dead what are the Particulars of this as to Taste Smell Colour Heat or Cold whether any Waters run into it and what Minerals are found near about it to which these Qualities can be mostly attributed 16. Whether the Iron that is said to be turned into Copper by the Vitriolate Springs at Cremnitz or Schmolnitz in Hungary do after that Transmutation or Precipitation contain a pretty deal of Gold 17. Whether the Depth of the Gold-Mines of Hungary be Two thousand four hundred Feet 18. What Quantity of Gold is got out of an hundred weight of Ore and whether it be got alone or mixed with other Metals in the Ore 19. Whether they find Trees or any other Salt in the solid Salt of their Salt-Mins 20. Whether there be a great Lake in Moravia whence the Waters at a certain Time of the Year are all drawn away by great Holes in the middle of it leading through subterraneous Passes and that so suddenly that the Fish are left on the Ground which afterward becomes good Pasture for another part of the Year the Waters then returning by the same Passages they went out and that with so much Force that it rises like a Jet of Water 21. Whether it is true That in some Parts of Hungary near the Gold Mines the Leaves of their Trees have their lower Superficies if not their upper also gilded over with yellowish Exhalations 22. What is the way said to be used in Hungary and Austria of extracting the Perfect Metals out of their Minera's without Lead performed by casting a Powder upon the Minera which makes a quick and advantagious Separation Sulphur being supposed to be an Ingredient of it Enquiries for Suratte c. 1. Whether it be true that Diamonds and other Precious Stones do grow again after three Years in the same Places where they have been digged out 2. Whether the Quarries of Stone near Fettipore not far from Agra in the Mogul's Dominions may be cleft like Logs and sawn like Planks to ciel Chambers and cover Houses therewith likewise whether about Sadrapatan on the Coast of Cormandel there be a Stone of the like nature so as setting a Wedge upon it one may cleave it with a Mallet as thick or as thin as one pleaseth and whether it be of the Nature of our Fire-stone that is prepared by the Stone-cutters for Ovens 3. Whether upon the same Coast of Cormandel about Toutoucourin and that of Ceylan at Manar and Jafanapatan they fish Pearls as good as those about Ormus whether those Pearls are the better the deeper they lie what is the greatest depth they are known to have been taken at and whether it be true that some
And by virtue of this Weight it is that Mercury is raised in Weather-Glasses and Water in Pumps And by several other Experiments made in an exhausted Receiver it appears That tho' Gunpowder will not explode when the Air presses not upon it nor will Fire burn Yet in the exhausted Receiver it is observed That a Loadstone hath externally applied considerable Effects on Bodies contained in it but Sounds are not propagated in vacuo In this Chapter he likewise farther teaches why two flat polished Marbles adhere to each other viz. By the Compression of the Atmosphere As also he tells us That the Weight of the Atmosphere was able to raise a Hundred Pound Weight tied to the Sucker of the Pump depressed when the Receiver was exhausted And in this Chapter he farther adds Experiments which shew That the Pressure of the Air is the Chief Cause of Filtration And as for the Distinction of the Proportion betwixt the Weight of Air and Water he proves it to be but as 1 to 938 That the Proportion of Quick-silver is as 14000 to 1. And besides these he hath made several Experiments and Observations which prove what Effects the Exhausted Receiver hath on Animals included in it and how long they are able to continue alive without Air. SECT XI The Fourteenth Fifteenth Sixteenth and Seventeenth Chapters only contain a Defence of what hath been delivered in the foregoing Chapter or Objections against what other Men have taught And the Subjects of the following Chapters to the Twenty ninth being of the like nature I shall not here tell what Notions he hath confuted but since he hath taught nothing but only defended his former Assertions I shall refer the Reader to the Epitomy SECT XII The Nineteenth Chapter only contains a Description of an Engine made use of in the Experiments which fill up the next Chapter where it is made to appear That Air is able barely by its Spring to raise Mercury in a Tube as also That Heat may be caused by a bare Attrition in an exhausted Receiver That the Spring of the Air is able to burst Bladders and to raise a considerable Weight as also That such one is able to raise Mercury no higher than the Weight of the Atmosphere is able to impel it and likewise to what heighth Mercury and Water may be raised proportionably to their Specifick Gravity And in this Chapter we are farther told how to discover the Pressure of the Air by the Touch and how to make portable Baromelers as also we are here taught That in an exhausted Receiver a Spring may be raised without any difficulty yet when the Air is let in it will be violently depressed again and not be raised again so easily And in the same Chapter it is likewise made to appear That Cupping-Glasses are caused to stick by the Pressure of the Air. There are several other Particular Experiments contained in this Volume which I shall not here take notice of for Reasons offered in my Preface CHAP. III. SECT I. THE First Chapter of the Third Book beginning the Second Volume contains several Experiments to prove farther the Weight and Spring of the Air from whence it appears That the Cause of the Ascent of Water in Syringes is to be derived from the Pressure of the Air That Light may be produced in vacuo Boyliano That by a small Quantity of included Air 50 or 60 Pound or a greater Weight may be raised in the exhausted Receiver SECT II. The Second Chapter contains Descriptions of several Engines made use of in succeeding Experiments SECT III. The Third Chapter shews That the Productions of Air may be helped several ways and that it may be obtained from Bread Grapes Raisins Plumbs Mustard boiled Apples c. In this Chapter we are likewise told how the Production of Air may be hindred as by Cold by making use of Spirit of Wine along with the Body included in vacuo or by employing Vinegar by Compression by Water or Leaven And in this Chapter we are farther taught That the Effects of Artificial Air are different from the Effects of Common Air as also That the Effects of Compressed Air are different from those of Common Air That Animals cannot live in Artificial Air That the Consumption of Combustible Matter is promoted by the Condensation of the Air That Air is produced from dried Fruits without any Regularity That Bodies afford as much Air as they can before they putrifie That Artificial Air may be destroyed That Liquors may acquire a Sourness tho' no Spirits evaporate That fermented Liquors may preserve Fruit That Beer may preserve Beef and That tho' Fishes yield not so much Air as Flesh yet they will corrupt tho' not affected by the outward Air That Butter may be preserved a long time if kept from the Contact of the outward Air That Sugar does not preserve Fruit as well as fermented Liquors Flesh may be kept fresh if kept in a strong compressed Air in a Receiver SECT IV. The Fourth Chapter shews That Bodies may be preserved a long time in Vacuo Boyliano without boiling SECT V. The Fifth Chapter shews That Air may become unfit for Respiration and yet retain its usual Pressure and also several Experiments to shew how long some sort of Animals may live without Air longer than others SECT VI. The Sixth Chapter contains Animadversions on Mr. Hobbe's Problemata de Vacuo and proves That the Atmosphere is the chief Cause of the Rise of Water upon Suction SECT VII The Seventh Chapter delivers the Cause of Attraction by Suction and tells us That it chiefly depends on the external Pressure of the Air when it is taken off the Internal Surface of the Liquor in a Tube And farther I. That a Liquor may be raised by Suction when the Pressure of the Air neither as it hath Weight nor Elasticity is the Cause of its Elevation II. That the Weight of the Atmospherical Air is sufficient to raise up Liquors by Suction SECT VIII The Eighth Chapter contains Observations and Directions about the Barometer and the Ninth contains only a Description of a new kind of Baroscope SECT IX The Tenth Chapter contains a Discovery of the admirable Rarifaction of the Air without Heat it being rarified so as to possess 8232 times its former Dimensions and sometimes to 10000. SECT X. The Eleventh Twelfth and Thirteenth Chapters shew That the Duration of the Spring of expanded Air is very considerable That the Air may be compressed into an eighth part of its former Space That the Proportion as to the Degrees of Rarification and Condensation is as 1 to 70. SECT XI The Fourteenth Chapter gives us a brief Account of the Utilities of Higgroscopes and tells us That the General Use is to estimate the Changes of the Air as to moisture and driness and the particular Uses of them is to know the differing Variations of Weather in the same Month Day and Hour To know how much one Season is drier or moister
the Faculties and Virtues of Animals and Plants depend not wholly on the Forms of mixed Bodies considered as such since the Effects of a Compound Body may be attributed to the mixed Action of the Compound Ingredients each of those Bodies co-operating and modifying each others Actions and this is evident since upon a Dissolution of that Union each Body hath its determinate Form and Virtue But here we must take notice That sometimes when the Specifick Form of a Body is destroyed the Qualities remaining may not always be the Result of united subordinate Forms but depend on the determinate Forms of particular Parts of that Body and sometimes several new Qualities may be added to a Body upon the Abolition of a specifick Form by the Influence of external Agents And to what hath been said concerning subordinate Forms we may add the following Particulars I. That it is no difficult Matter to determine the Nobleness of Forms II. Tho' several Alterations are made in Bodies by a Recess or Access of Qualities yet they retain the same Denomination and are said to have the same Form by reason of some Eminent Quality or Use III. Several Effects will be produced by Compound Bodies upon the account of the Union and Joint-Action of their Ingredients IV. Sometimes a superadded Form is accidental to a pre-existent yet it modifies the Operation of it without altering its Nature V. Besides the Operations of a Body which are specifick in respect of the whole it may have several Effects depending on the seperate and particular Properties of an Ingredient VI. That is often called the specifick Form in Bodies which is not the presiding but the most eminent VII The Forms of a Body generally called Subordinate may with more Reason be called Concurrent since upon their Coalition depends the Form of the Whole SECT V. The Fifth Chapter shews That a slight Variation of Texture produced by Motion is able to discriminate Natural Bodies and to cause them to have different Effects as Ice and Salt will freeze other Liquors tho' Water and Salt will not Where it is also made to appear that the Productions of Art are really the Effects of Nature since the Artist only puts Natural Bodies together but their Effects are really produced according to the Laws of Nature SECT VI. The Sixth Chapter teaches That the curious and various Figures of Salts may be produced without the Assistance of a Plastick Power and may result from a bare Connexion of Metalline and Saline Bodies and their Figures may vary according to the different Quantities of Liquors or the Space of Time they shoot in And as for Acids they are observed to shoot into Chrystals variously figured according to the Nature of the Menstruum or the Bodies it works upon and that by slight Alterations without the Assistance of substantial Forms Salts may be obtained appears from several Experiments laid down in that Chapter SECT VII The Eighth and Ninth Chapters containing several Experiments from whence it appears consonant to what hath been already delivered That by Alteration of Texture and a new Modification of Matter several Changes may be wrought in Bodies without the Help of substantial Forms From which Experiments several Inferences are drawn to shew the Absurdity of the Aristotelian Principles SECT VIII The Tenth Chapter contains several Experiments to shew That by an Alteration of the Textures of Bodies several Qualities may be destroyed in a Body and regained again and particularly in Salt-petre As also That the same Particles of Matter may have different Effects when in a fluid Form from what they have when solid And in the same Chapter it is made to appear That Chymistry rather destroys than discovers the Principles of Natural Bodies SECT IX In the Eleventh Chapter which contains the History of Fluidity we are told That a Body is said to be fluid because it consists of Parts which easily slip upon one another's Surfaces to which they are inclined by their porous Interstices and because by the Motion of their Parts they spread and diffuse themselves on every side till opposed by some solid Body to the Superficies of which they adapt themselves And in the same Chapter we are farther taught That in order to render a Body fluid it is requisite the Parts of them should be very minute as also of a determinate Figure That there should be Pores betwixt their Parts and that their Parts should be in a perpetual and a variously determined Motion It also shews us how a Fluid may be obtained from a Consistent Body and having illustrated the Doctrine of Fluidity by Experience it farther makes it evident That the Reason why some Fluids will not mix with others is only their particular Textures and peculiar Motion of their Parts SECT X. The Twelfth Chapter shews That the Superficies of Liquids pressing one against another give each other different and determinate Figures SECT XI The Thirteenth Chapter gives us the History of Firmness and tells us That Solidity consists in this viz. That the gross Parts of solid Bodies are so interwoven together that they are unapt to diffuse themselves several ways like Fluids and that the Figure of their Superficies is chiefly owing to the Connexion of the Parts that compose them rather than to outward Bodies so that these Three Things seem chiefly to be the Causes of Solidity Grossness of Parts Rest and the Implication of their Constituent Parts In this Chapter he also teaches That a Juxta-Position of Parts is not the only Cause of Cohesion but that the weight and spring of the Air is one great Cause nevertheless a Juxta-Position of the Parts of Glass seems requisite and sufficient to make so compact a Substance the Parts of the Matter of which it is composed being first minutely divided by the Fire before their Union And In this Chapter he farther teaches us That the Figures and Textures of the Parts of a Body may not only contribute to their Solidity but that some Liquids may become solid upon the Interposition of the minute Parts of another Body and that a Liquor may become solid upon the Addition of a Powder only And In the same Chapter we are farther taught That fluid Bodies consist not of Parts divisible into Fluid as Quantity into Quantity That there is a Plastick Power inherent in several Bodies and that Mixture is sufficient to produce Petrification SECT XII The Fourteenth Chapter contains several Instances to shew That there is a Motion in the Parts of Consistent and even Solid Bodies SECT XIII The Fifteenth Chapter treating of the great Effects of languid and unheeded Motion brings several Instances and Observations to prove I. The great Efficacy of Celerity in Bodies very small especially if the space they move through be but small as in Lightning II. That the insensible Motion of so soft Bodies as Fluids may have a sensible Operation upon solid Bodies as in Sounds when they shake the Windows of a House c.
and impossible to preserve it SECT XIV The Eighteenth Chapter contains Experiments about the Relation betwixt Air and the Flamma Vitals of Animals from whence it appears That it is as impossible to preserve Animals without Air as Flame SECT XV. The Twentieth Twenty first and second Chapters contain several Experiments which shew That shining Flesh and Fish as well as Worms cease to become lucid if deprived of the Contact of the Air. SECT XVI The Twenty third Chapter contains several Experiments made with a Diamond which shone in the Dark SECT XVII The Twenty fourth and fifth Chapters give an Account of an Aerial and Icy Noctiluca whose Lucidness depend on Fumes raised by the Saline Parts of the Air which being united with the Air affect the Eye jointly CHAP. V SECT I. THE Five first Chapters of the Fifth Book and the First Part shew That Bodies have only a Relative Levity under Water That the Air by virtue of its Spring presses on Bodies under Water and that the Effects of the Air on such Bodies vary according to the differing Weight of the Atmosphere and likewise contain an Invention for estimating the Weight of Water in Water SECT II. The Sixth Chapter contains the following Hydrostatical Paradoxes made out by several Experiments I. That in Water and other Fluids the lower parts are pressed by the upper II. That a lighter Fluid may weigh upon a heavier III. That if a Body contiguous to the Water be altogether or in part lower than the highest Level of the said Water the lower part of the said Body will be pressed upwards by the Water that touches it beneath IV. That in the Ascension of Water in Pumps c. there needs nothing to raise the Water but a competent weight of an external Fluid V. That the Pressure of an external Fluid is able to keep an Heterogeneous Liquor suspended at the same height in several Pipes tho' those Pipes be of very different Diameters VI. If a Body be placed under Water with its uppermost Surface parallel to the Horizon how much soever Water there may be on this or that side above the Body the direct Pressure sustained by the Body is no more than that of a Column of Water having the Horizontal Superficies of the Body for its Basis and the prependicular depth of the Water for its Heighth And so likewise If the Water that leans upon the Body be contained in Pipes open at both ends the Pressure of the Water is to be estimated by the weight of a Pillar of Water whose Basis is equal to the lower Orifice of a Pipe and its heighth equal to a Perpendicular reaching thence to the top of the Water tho' the Pipe be much inclined towards the Horizon or tho' it be irregularly shaped and much broader in some Parts than the said Orifice VII That a Body immersed in a Fluid sustains a lateral Pressure from the Fluid and that increases as the Depth of the immersed Body below the Surface of the Fluid increases VIII That Water may be made to depress a Body lighter than it self as well as to buoy it up IX That a parcel of Oil lighter than Water may be kept in Water without ascending in it X. That the Cause of the Ascent of Water is Syphons and of flowing through them may be explained without having recourse to Nature's Abhorrency of a Vacuum XI That a solid Body as ponderous as any yet known tho' near the top of the Water will sink by its own weight yet if it be placed in a greater depth than that of Twenty times its own thickness it will not sink if its Descent be not assisted by the weight of incumbent Water SECT III. The Eighth Chapter contains a Description of a new Hydostratical Instrument to estimate the difference of Metals in goodness SECT IV. The Ninth Chapter contains a short Account of the Increase and Growth of Metals And the remaining Chapters of the First Part of the Fifth Books lays down a Method to estimate the Goodness of Ores and also of Medicinal Substances by which it may easily appear That if a Body be heavier than Chrystal it must contain more or less of a Metalline Ingredient as it exceeds that in weight CHAP. VI. SECT I. THE Second Part of the Fifth Book contains several solitary Observations and Experiments both Chymical Medicinal and Physical which since nothing can be inferred from them but what hath been already taught it will be needless to mention what is contained therein especially since Historical Relations cannot be more contracted than in the Epitomy CHAP. VI. SECT I. THE First and Second Chapters of the Third Part of the Fifth Book teach That all Gems have been once in a fluid Form and that they receive their Virtues and Colours from Mineral Tinctures SECT II. The Second Chapter shews That even solid Bodies continually emit Effluvia SECT III. The Fourth Chapter shews the strange Subtlety of Effluvia a Grain of Silver Wyre consisting of 64800 true Metalline Parts and a Grain of Leaf-Gold being capable of being divided into 2000000 Squares And Fillings of Copper will give a Tincture to 613620 times their Bulk of Water SECT IV. The Fifth Chapter shews the great Efficacy of Effluviums as in Lightning and other Effluviums which affect Humane Bodies SECT V. The Sixth Chapter proves That the Effluviums of Bodies act according to the determinate Nature of the Body they come from SECT VI. The Seventh and Eighth Chapters shew That not only Animal but other solid Bodies are porous SECT VII The Ninth and Tenth Chapters contain a Natural History of Humane Blood for which I must refer the Reader to the Epitomy it not admitting of a Recapitulation of the Contents in much less room than they are there contained in SECT VIII The last Chapter of the Third Volume shews That the Operations of Specifick Medicines are Reconcilable to the Conpuscular Philosophy What he hath delivered concerning the manner of their acting it may be comprized under the following Heads Prop. I. Sometimes a Specifick Medicine may cure by discussing or resolving the Morbifick Matter and thereby making it fit for Expulsion by the greater common-Shoars of the Body and the Pores of the Skin Prop. II. Sometimes a Specifick Medicine may mortifie the over-acid or other immoderate Particles that infect the Mass of Blood and destroy their Coagulatory or other Effects Prop. III. Sometimes a Specifick Medicine may help the Patient by precipitating the Morbisick Matter out of his Blood or the other Liquors of the Body in which it harbours Prop. IV. Sometimes a Specifick Medicine may work by peculiarly strengthening and cherishing the Heart the Part affected or both Proy V. Sometimes a Specifick Medicine may act by producing in the Mass of Blood such a Disposition as may enable Nature by correcting expelling or other fit Ways to surmount the Morbifick Matter or other Cause of the Disease Prop. VI. Sometimes a Specifick Medicine may unite with the