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Show 0f the Eyes. Boole lll. the reception of they are with divers degrees of Denlity, which hinder . . e. fublianc ed compact Light, into their more more learned ()Aflendxu is of a different Sentiment, affirming Bodies arefpaces, fewer empty or lefs tranfparent, as their parts have greater or Book III. Oft/oe Ejer. And it being granted, that Jewels, Diamonds, Criltal, and common Glafs, are made up of numerous thin, and thicker con}oyned Lamina; and are thereupon more or lefs clear and tranfparent, as the greater or lefs proportion oflucide Particles ( which being fubtle aethereal Bodies) can ealily infi- com. receptive of Rays of light, and are more or lefs Opace, as they are ounded of more or lefs denfe Atomes, givmg a refinance to, and making nuate themfelves between the Commiflilres of the Flakes,and give a greater or of the reflexions of the beams of Light, in whichI will give you the words up of more or lefs thin Shells, between whofe joynts the beams of Light do more or lefs difplay themfelves, and render their Bodies more or lefs Diaphanous: f0 that this conjeéiure of Tranfparency may have probability opaeo 80. Author, making this inference aftera difcourfe of tranfparent and dies : chuitur dcm'qne ut inter fpaciunt [umme perfpzcrmm, (J. ‘ca-rpur jttmme opamm, fimt omner gradur perjpicmrzmr @- opacrmhe mlermm'u, ml. arm m be gradibur, Imllnm fit corpus adea perjjzzcuum, cuz mm mtfla alzqud opera", fill/[Mm adto sputum, mi non aliqua perfpimz'raa, urpote tarrquam ext/tentzhrrr iii-grub" zr raa'm abf. [patio/it, mmc pluribm, "mic parttioribur Corpufculss quae trajeéiur of Bofpaces empty the in founded 15 Opinion This repel/am. illofque flmzt dies, which being more or lefs numerous, do conl'titute greater'or lefs degrees of tranfparence, as receptive of more or lefs influxes of Light , The Learned Author farther illulltatcth this afiertion with divers infiances; Air ille, togirrz quam [in-at facilim explicam negotium- per interpojilionere inanir, n(i fummfnperim, cumde immi difl‘erimm, jimilrludmc trztltz quad laxzus, prrfliu/Z que cupit, majarcm minoremque locum, in media. Ant quemadmodum wellm mm didurcmer, atque camprimentcs, concipimm‘ aerem rarefacere 2'9» addenflzri ac rarimtem fieri, cum pi/i prim q/z'ciniarer detrahenmr afiinwicem, lacquer»- tertipiantur, plum autem nut ampliom in quibu: lame nihil fit, deufimtem mm, mm 1mm priiu diflamiarer magi; adfesmutuo accedant, locaqne pauciora, minamee intertipiantur. The Renowned Authors meaning in this ( as l fuppofe) that the grains of Corn, as they lye more clofe orloofe in the Bulhel, are more or lefs extended, and affeéied with greater or lefs degrees of Rarity and Denlity, as they have more or lefs empty fpaces 3 And fo proportionabl y a Fleece ofWOoll hath more or lefs Rarity, and Denfity, as the Hairs are more united to, or diliant from each other ', and as they lye more loofe or comprelied, have more or lefs intercepted fpaces, which I humbly conceive, are not mere vacuiries ( as the Learned Author will have in) by reafon the intercept- ed {paces found in the loofe polition of Corn, and the Interltices in the contexturt of Wool], are not (as I conceive) defiitutc of all Bodies, bunt: filled with fubtle Particles, as little Cells of Air, out of which it maketli a quick retreat into that common ambient Receptacle, when the grains ofCorn, or hairs of Wooll run clofe together by a Compreflive force. Signiggzrfors And afterl have given Great Gaflendm his more profound NotiOns 0i Tranfnarency_ tranfparent Bodies, I take the boldnefs humbl to offer fome of mm own meaner Sentiments, wherein I apprehend much of Tranfparency to proc from the different contexture of Bodies, which are more or lefs pellucidc, as they conlifi of many thicker or thinner Laminar, placed one above another, and joyned fo near together with molt curious Commilfuresfihat they {33¢me conl‘titute one entire fubliance, by reafon we are not able to difcern the edges of the Commiflures in the Compage of Gemms, Diamonds, Glafs, and 0th lcfs brightnefs to the whole laminous Body, as it is compofed, and made in folid Bodies, as framed ofdivers thin Plates 3 but the account may be diffe- rent of thefe folid and fluide Bodies, as having many minute Particles, which may be eafily feparated, and have numerous little Pores, filled with more fubtle Airy, or [Ethereal Particles, which will eafily infinuate into the in. ward Recelles of fluide Bodies, and pals through to the ambient parts, fo that a Body lefs fubtle then that of Air , as the fmoak of Tobacco, will be tranfmitted through the pores of Water, which hath been often made appear to vulgar Eyes 2 whereupon liquid Bodies, confil'ting of innumerable minute Particles, are every where befet with linall Pores, replenilhed with airy Particles, into which Rays of l ight being freely darted, do give it a beautiful Tranfparency, which is more or lefs vifible, as the Liquor is more or lefs Lympide, caufed by greater or lefs defamation, from grofs and earthy Particles, rendring Liquors more or lefs turbid; whereupon they are receptive, of more or lefs irradiations of Light. The Formth The Criliallinc Humor of the Eyes is formed of the tranfparent fluide Par- on of the Criflalline ticles of the feminal Matter, into whofe numerous Pores, fraught with thin Humor, airy Atomes, the beams of Light may make many atrangments, every way difpofing them to Tranfparency: and though afterward this Criltalline Humor, impregnated with faline Particles, groweth fomewhat more folid, yet it retainerh fiill more fpaces, replenilhed with thin volatil fubfiances, capable to receive the tranfmillions of Light,which by making themfelves paffages every way, do difpofe the more folid Particles after a manner requilite to the conflitution of a tranfparent Body : An inflzance may be given, Thar Silver in Aqua- ortir, or Lead in Spirit of Vinegar, have, by that folution, their Particles reduced to a more Huide Form,vand their fubflance before Opace, is f0 difpofed of by Art, as to make a diaph‘anous Solution; but if one pleafeth to make tranfparent Criflals, it may be obfervable, that Bodies once fluide, and highly affeéted with Rays of Light, are fo ordred, that though they grow afterward concre- ted, yet they retain much of the Firfi: impreflion of tranfparent Bodies, as may be (em in Crifials, Ice, and alfo in Diamonds, and other jewels, which I conceive are originally fluide Bodies, infiluria principiir, and afterward are coagulated into more folid Bodies by their petrefcent Liuors. q The Vitreous Humor is f0 called, becaufe it refembleth Glafs melted by tranfparent Bodies, which do admita fplitting, according to their Grain,an Duéis of the flakes in Glafs, Diamonds, 6c. and cannot be Well and eqlfll' an intenfe Fire, both in Conlifiencc and Tranfparence, and is fomewhar more fluide then the Cril'calline Humor, and more foli‘d and vifoous then the Aqueous. Its lituation is in the lower region of the Eye, and containeth the ly parted crofs-Ways againfi the Grain and Dué'ts of the Commiflizres, but , SCgments of the lower Region, belonging to the Crifl'alline Humor, in' thfiey will irregularly break into odd pieces, and defeat the dcfign of the A" ti cer. its Sinus. The Figure is Semilunary, Concave in the upper Surface, as having greater dimenfions about the middle, and terminating into Two gbtufe And 01165. |