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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A28569 A discourse concerning the origine and properties of vvind with an historicall account of hurricanes and other tempestuous winds / by R. Bohun ... Bohun, R. (Ralph), d. 1716. 1671 (1671) Wing B3463; ESTC R18477 75,446 324

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The Matter of Winds according to Aristotle is 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 A Dry and Fumid Exhalation wee have his Sentiments more particularly in the second book of Meteors 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 On which Text the succeeding Peripatetics seem to ground their Doctrine that neverthelesse may admit of a farre greater Latitude then the Modern Schooles allow For he never altogether excluded moist Bodys as is expressy declar'd in the same Chapter though the Degrees of Siccity were always to be most Prevalent 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 c. I acknowledge that Winds may sometimes consist of Hot dry Exhalations but the Humid Aqueous are much better adjusted to the design For this reason rain is the usuall Prognostick of Winds because the plenty of moisture then floating upon the superficies of the Earth is afterwards dilated and put in motion by the heat of the Sun as Lucretius instances in wet clothes and Aristotle in moist wood that emit greater quantityes of steams and wreke more then Dry for although the Fumid and Terrene concretions especially those Earths and Salts in the Caverns and spiracles under Ground being Agitated by the Subterraneall fires require a farre intenser heat to resolve them into Winds being of much more tenacious figures then Water and other liquids which hang loosely together and are sooner expanded into larger dimensions VVherefore the definition of Metrodorus in Plutarch seems to excell That VVind is 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 Aquosi anhelitus aestus And though Aristotle declares they confist of Hot dry exhalations at least the Earthy parts to be always most predominant yet by travelling or'e lakes or snowy Mountains he allows they may become moist or cold wee find that almost any stirring or Ventilation of the Air do's refrigerate Neither did the Stagirite himself so strictly confine his Hypothesis to the Hot and terrestriall Exhalations For in the 2d booke of his Meteors he acknowledges the Etesians to be generated from the colliquation of ice snow in the Polar regions 〈◊〉 〈◊〉 〈◊〉 〈◊〉 〈◊〉 c. Quibus à sole colliquatis flare soliti sunt But why should I longer dispute their materials and propertys Winds are hot dry cold have the greatest diversitys of qualitys accidents They may consist of almost infinite variety of salts spirits juyces and minerals Subterraneous damps agitated Air dissolv'd Snows broken and dissipated Clouds rarify'd vapors and what not For most bodys being sufficiently dilated and put in motion are convertible into Wind. Next as to their Limits and Seasons Some spread many thousand leagues and others not above 2 or 3 miles from their Fountains I call That the Country or Fountain of VVind where are those Caverns or other Locall Origin's which gave them birth Wee cannot easily determine of their Altitude My Lord Bacon delivers his sense that they not only aspire to the Confines of the Middle Region but soar above the generallity of Clouds as wee oftentimes observe the Clouds move a gentle breath fanning the top branches of trees and yet not the least Brise of Wind stirring neer the surface of the Earth which shows they sometimes prevayle most in the Lower and otherwhile in the remoter stations of the Air and so accordingly mount higher or descend as they happen to be more or lesse depres'd by the Gravity of the Atmosphere Varenius perceiv'd the smoake issuing from the top of mount Aetna to be Agitated and tost up and down as from the tunnells of chimnys which though it lifts up its snowy head into the Second Region yet it is not altogether exempt from the incursions of Winds However Acosta travelling o're the Peruvian hils discover'd no violent motion of the Air but rather an Aether so subtilis'd and ignite that it caus'd heavings convulsions in animals so that they were forc't to thicken it with spunges to prevent immediate suffocation In like manner the highest eminency or peak of Tenariffe is always at peace nor expos'd to those storms which sometimes infest the lower parts or neck of the Mountain The Alps and Pyreneans or whatever hils beside that are cover'd with perennial snows are also lyable to VVinds from their resolution in the Summer but the Peruvian and some others which may be reckon'd as the Extravagancys of Nature that threaten the sky and overlook the Clouds with their prodigious height are I suppose never disturb'd by tempests though I question whether any of our European world can pretend to this priviledge yet the Grecian historians who took all opportunitys to advance the miracles of their country relate of the Macedonian Athos That it was Customary when they sacrific'd on the top of of the mountain to inscribe their names in the ashes and the characters are said to have remain'd all the yeer round without being in the least defac'd by the VVinds. The Spring and Autumn especially about the time of either Aequinox are the most Flatulent seasons of the yeere It 's observable the complexion of the Air is generally more silent at Midday and in Soultry Weather when the Exhalations are too much attenuated to constitute Winds which require a very considerable density and refrigeration For this reason the South Winds usually blow in the Night the Air being over much refin'd in that quarter by the heat of the Day till it condense again by the moderate cold of the night The Spring is generally more Windy then the Violent heats of Summer both from the liquefaction of snows and because the pores of the Earth are then loosen'd and the Vaporous effluxions releast from their former imprisonment during the Frost and therefore those VVinters which have least frost and the Vapors suffer'd freely to transpire are expos'd to the most boystrous Winds as for example the last in the yeere 1670. Likewise in Autumn wee have commonly very blustring weather most about the other Aequinox when the Sun principally dilating the Air between the Tropiques causes a more violent protrusion towards the Poles of the VVorld Shall wee say that the luxuriant Rains which fall at that time of the yeare affor'd more plentifull materials for VVind Or is it by reason the reservs of the Summer Vapors are condens'd by the Autumnall cold when the heat of the Summer too much refines and dissipates the exhalations the inclemency of the Winter rather thickens them into Snow or Clouds So that a just and moderate condensation is necessary to the constitution of VVinds if it be too much they degenerate into rain c. if too little they become Stagnant Air. But from their Limits and Seasons I descend to the more remarkable Species As the Generall or Tropicall VVind the Provinciall the Land and Sea Brises the severall sorts of Etesians and Monsoons in the Indian Seas c. and shall from thence proceed to their Qualitys and Prognostiques The Generall or Trade VVind continues all the yeare round with little variation It is likewise call'd the Tropicall Levantine