Descartes, René
,
Renati Des-Cartes principia philosophiae
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rationem ob quam carbones extincti videntur nigri,
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non aliam eſſe quàm quòd omnis eorum ſuperficies,
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tam interna quàm externa, particulis iſtis tertii ele
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menti mollioribus contecta ſit; quae particulae mol
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liores cùm ignis vi à reliquis ſeparantur, carbones,
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qui nigri erant, in cineres, non niſi ex duris & ſolidis
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particulis conflatos atque ideò albos, mutantur; &
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nulla ſunt corpora reflectendis radiis magis apta quàm
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alba, nulla minùs quàm nigra. </
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>Tertiò, ut putemus
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partem illam rariorem Cometae, aliâ minùs aptam eſſe
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ad motum, & ideô, juxta leges Mechanicae, debere
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ſemper eſſe in concavâ parte lineae curvae, quam
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Cometa motu ſuo deſcribit: quia ſic alià paulò tar
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diùs incedit, & cùm lineae iſtius cavitas ſemper reſpi
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ciat centrum vorticis in quo eſt Cometa (ut hîc cavi
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tas ejus partis N C 2 reſpicit centrum S, cavitas partis
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2 3 4 reſpicit F &c.), ideò illum ex uno vortice in alium
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tranſeundo converti. </
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rem
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volantibus, pennatam earum partem eſſe ſemper aliâ
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inferiorem cùm aſcendunt, & ſuperiorem cùm deſcen
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dunt. </
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>Denique plures aliae rationes dari poſſent, cur
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Cometae à nobis non videantur, niſi quamdiu tran
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ſeunt per noſtrum coelum: ex minimis enim momentis
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pendet, ut idem corpu radiis reflectendis aptum ſit
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vel ineptum: & de ejuſmodi particularibus effectis, de
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quibus ſatis multa experimenta non habemus, ſufficere
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debent veriſimiles cauſae, licet eae fortè non ſint verae. </
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CXXXII.
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Cur Cometae à nobis
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non videantur, cùm
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ſunt extra noſtrum
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caelum: & obiter, cur
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carbones ſint nigri,
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4& cineres albi. </
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Praeter haec autem, obſervatur etiam circa Come
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tas, longèam radiorum veluti comam fulgere, 'a quâ
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nomen ſuum accepertunt; atque iſtam comam ſemper </
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