Descartes, René
,
Renati Des-Cartes principia philosophiae
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tur, non ſemper eundem ſitum ſervant, nec ideò par
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ticulas ſtriatas rectà pergentes, niſi admodum diffi
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culter, admittunt. </
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CXIII.
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In omnibus maculis
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multos meatus à par
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ticulis ſtriatis exca
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vari. </
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Sed facil` fieri poteſt, ut eadem ſtella fixa per vices
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appareat & diſpareat, ſinguliſque vicibus
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diſ
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parebit, novo cortice* macularum involvatur. </
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>Talis
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enim alternatio eſt naturae valde familiaris, in corpo
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ribus quae moventur: ita ſcilicet ut, cùm ab aliquâ
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cauſâ verſùs certum terminum impulſa ſunt, non in
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eo ſubſiſtant, ſed ulteriùs pergant, donec rurſus
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aliâ cauſà verſùs ipſum repellantur. </
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>Ita, dum pondus
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funi appenſum, vi gravitatis ab uno latere ad perpen
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diculum ſuum deſcendit, impetum acquirit, à quo
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ultra iſtud perpendiculum in oppoſitum latus fertur,
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donec rurſus gravitas, iſto impetu ſuperato,
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ver
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ſùs perpendiculum moveat, & inde novus in eo im
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petus oriatur. </
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>Ita, vaſe ſemel moto, liquor in eo con
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tentus multoties it & redit, antequam ad quietem
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reducatur. </
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>Et ita, cùm omnes coelorum vortices in
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quodam aequilibrio conſiſtant, ubi unius
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ſe
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mel ab iſto aequilibrio receſſit, poteſt multoties nunc
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in unam nunc in adverſam partem excurrere, ante
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quam ab iſto motu quieſcat. </
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CXIV.
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Eandem ſtellam poſſe
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per vices apparere ac
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diſparere. </
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Fieri etiam poteſt ut totus vortex, in quo talis ali
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qua ſtella fixa continetur, ab aliis
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vorticibus abſorbeatur, & ejus ſtella, in aliquem ex
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iſtis vorticibus abrepta, mutetur in Planetam vel Co
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metam. </
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>Nempe duas tantùm cauſas ſuprà invenimus a, </
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