Descartes, René
,
Renati Des-Cartes principia philosophiae
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ſecundi elementi, ſed à ſolâ materiâ primi poſſint oc
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cupari. </
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C.
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De iis quae ignem
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exſtingiuunt. </
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30</
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Contrà autem aqua videtur igni valde adverſa, quia
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particulis conſtat non modò craſſiuſculis, ſed etiam
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laevibus & glabris: quo ſit, ut nihil obſtet,
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globuli ſecundi elementi undique illas cingant & ſe
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quantur; atque inſuper flexilibus, quo ſit, ut facilè
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ſubeat meatus corporum quae ùruntur & ex iis ignis
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particulas accendo, impediat ne alipae igneſcant. </
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CIV.
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Cur aqua difficilimè.</
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5</
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Sed tamen nonnulla corpora talia ſunt, ut
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par
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ticulae eorum meatibus immiſſae ignem juvent; quia
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inde cum impetu reſilientes, ipſae igneſcunt. </
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bri carbones foſſiles aquâ aſpergunt. </
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copia, ingentibus flammis injecta, ipſas auget. </
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etiam ſalia potentiùs praeſtant: cùm enim
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particulae rigidae ſint & oblongae, ſpiculorum inſtar in
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flammâ vibrantur, & in alia corpora impingentes ma
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gnam vim habent ad ipſorum minutias concutiendas:
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unde fit, ut metallis liquefaciendis ſoleant adjungi. </
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CV.
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Cur vis magnorum
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ignium ab aquâ aut
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ſalibus injectis au
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geatur. </
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10</
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15</
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Illa autem quae alendo igni
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adhiben
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tur, ut ligna & ſimilia, conſtant variis particulis, qua
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rum quaedam ſunt tenuiſſimae, aliae paullô craſſiores,
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&sgradatim aliae craſſiores, & pleraeque ſunt ramoſae,
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magnique meatus ipſas interjacent: quo fit ut ignis
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particulae, meatus iſtos ingreſſae, primo
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te
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nuiſſimas, ac deinde etiam mediocres, & earum ope
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craſſiores celerrimè commoveant; ſicque globulos coe
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leſtes, primò ex anguſtioribus intervallis, ac deinde
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etiam ex reliquis excutiant; ipſaſque omnes (ſolis
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craſſiſſimis exceptis, ex quibus cineres fiunt)
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abripiant. </
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