Descartes, René
,
Renati Des-Cartes principia philosophiae
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riùs pergant verſus H, ubi paullatim agitationem ſuam
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deponunt, ſicque vertuntur in fumum. </
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XCVII.
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Cur ejus flamma ſit
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acuminata, & fumus
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ex eâ egrediatur. </
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Qui ſumus nullum in toto ae
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re locum reperiret, quia
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nullibi vacuum eſt, niſi, prout egreditur ex flammâ,
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tantundem ae
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ris verſus
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circu
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lari motu regrederetur. </
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>Nempe, dum
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fumus aſcendit ad H, pellit inde ae
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rem verſus I & K, qui ae
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r, lambendo
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ſummitatem candelae B ac radices el
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lychnii F, ad flammam accedit,
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alendae inſervit. </
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>Sed ad hoc non ſuſ
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ficeret, propter partium ſuarum te
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nuitatem, niſi multas cerae particulas,
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calore ignis agitatas, per ellychnium
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ſecum adduceret. </
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<
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>Atque ita
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debet aſſiduè renovari ut conſerve
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tur, & non magis eadem manet, quàm flumen ad quòd
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novae ſemper aquae accedunt. </
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XCVIII.
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Quomodo ae
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r & alia
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corpora flammam
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alant. </
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Motum autem circularem ae
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ris & ſumi licet expe
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riri, quoties magnus ignis in cubiculo
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exci
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tatur. </
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>Si enim cubiculum ita ſit clauſum, ut praeter
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tubum camini per quem fumus exit, unum tantùm ali
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quòd foramen ſit apertum, ſentietur continuà magnus
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ventus, per hoc foramen ad focum tendens, in locum
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fumi abeuntis a.
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XCIX.
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De motu ae
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ris verſus
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ignem. </
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Atque ex his patet, ad ignis conſervationem duo re
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quiri: primum, ut in eo ſint particulae terreſtres, quae,
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à primo elemento impulſae, vim habeant impediendi,
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ne ab ae
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re aliiſve liquoribus ſupra ipſum poſitis ſuf
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ſocetur. </
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<
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>Loquor tantùm de liquoribus ſupra
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