Descartes, René
,
Renati Des-Cartes principia philosophiae
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CVI.
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Qualia ſint corpora
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quae facilè uruntur. </
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Et cùm ejuſmodi particulae, quae ex corpore, quòd
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uritur, ſimul egrediuntur, ſunt tam multae ut vim ha
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beant globulos coeleſtes ex aliquo ae
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ris vicini ſpatio
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expellendi, ſpatium illud flammâ implent. </
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pauciores, fit ignis ſine flammâ, qui vel paulatim per
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fomitis ſui meatus ſerpit, cùm materiam quam poſſit
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depaſcere, ibi nanciſcitur: ut in iſtis funibus ſive elly
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chniis quorum uſus eſt in bello ad tormentorum pul
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verem incendendum. </
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CVII.Cur quaedam inflam
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mentur, alia non. </
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Vel certè, ſi nullam talem materiam circa ſe habet,
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non conſervatur, niſi quatenus incluſus pori corpo
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ris cui inhaeret, tempore aliquo eget ad omnes ejus
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particulas ita diſſolvendas, ut ſe ab iis poſſit liberare. </
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Hocque videre eſt in carbonibus accenſis, qui cineri
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bus tecti, per multas horas ignem retinent, propter
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hoc ſolùm, quàd ille ignis inſit quibuſdam particulis
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tenuibus & ramoſis, quae aliis craſſioribus implicatae,
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quamvis celerrimè agitentur, non tamen niſi unae poſt
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alias egredi poſſunt; ac fortè priuſquam ita egredian
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tur, longo motu deteri, & ſingulae in plures alias di
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vidi debent. </
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CVIII.
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Cur ignis aliquandiu in
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primis ſe conſervet. </
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Nihil verò celeriùs ignem concipit, nec minùs diu
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illum conſervat, quàm pulvis tormentarius, ex ſul
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phure, nitro, & carbone confectus. </
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<
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ſulphur quam-maximè inflammabile eſt, quia conſtat
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particulis ſuccorum acrium, quae tam tenuibus & ſpiſ
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ſis materiae oleagineae ramulis ſunt involutae, ut per
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multi meatus inter iſtos ramulos ſoli primo elemento
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pateant. </
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calidiſſimum cenſeatur. </
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CIX.
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De pulvere tormentario
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ex ſulphure, nitro &
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carbone confecto; ac
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primo de ſulphure. </
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30</
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Nitrum autem conſtat particulis oblongis & </
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