Descartes, René
,
Renati Des-Cartes principia philosophiae
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eſſe intelligimus, quàm extensionem inlongum, latum
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&sproſundum, non ſoleamus decere ibi eſſe corpus, ſed
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tantummodo ſpatium, & quidem ſpatium inane, quod
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ferè omnes ſibi perſuadent eſſe purum nihil. </
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V.
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Praejudicia de rareſa
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ctione & de vacuo,
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hanc corporis natu
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ram obſcuriorem fa
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cere. </
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Sed quantum ad rarefadionem & condenſationem,
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quicunque ad cogitationes ſuas attendet, ac nihil volet
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admittere niſi quod clarè percipiat, nonputabit in ipſis
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aliud quidquam contingere, quàm figurae mutationem:
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ita ſcilicet, ut rara corpora illa ſint, inter quorum par
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tes multa intervalla exiſtunt, corporibus aliis repleta,
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&sper hoc tantúm denſiora reddantur, quòd ipſorum
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partes, ad invicem accedentes, intervalla iſta' immi
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nuant vel planè tollant: quod ultimum ſi aliquando
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contingat, tunc corpus tam denſum evadit, ut repu
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gnet ipſum denſius reddi poſſe. </
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>Atqui non ideò minús
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tunc extenſum eſt, quàm cúm partes habens à ſe mu
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tuò diſſitas majus ſpatium ampleditur: quia quicquid
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extenſionis in poris ſive intervallis à partibus ejus
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relictis continetur, nullo modo ipſi tribui debet, ſed
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aliis quibuſvis corporibus, a quibus intervalla iſta
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replentur. </
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>Ut cúm videmus ſpongiam, aquâ vel alio
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liquore turgentem, non putamus ipſam ſecundúm ſin
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gulas ſuas partes magis extenſam, quàm cúm com
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preſſa eſt & ſicca; ſed tantummodo poros habere
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magis patentes, ac ideò per majus ſpatium eſſe dif
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fuſam. </
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VI.
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Quomodo fiat rare
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factio. </
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Et ſanè non video, quid moverit nonnullos, ut mal
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lent dicere rarefactionem fieri per augmentationem
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quantitatis, quàm ipſam hoc ſpongiae exemplo expli
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care. </
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<
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>Nam etſi, cùm ae
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r aut aqua rarefiunt, non vi
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deamus ullos ipſorum poros qui ampliores reddantur, </
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