Descartes, René
,
Renati Des-Cartes principia philosophiae
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Nam cùm, exempli cauſâ, in bellico tormento pauca
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quaedam pulveris grana, ellychnii, alteriuſve fomitis
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igne contacta, prima omnium accenduntur, flamma
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ex iis erumpens, in minimo temporis momento, per
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omnia granorum circumjacentium
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diſper
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gitur; ac deinde, quamvis non tam ſubitò ad interio
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res ipſorum partes poſſit penetrare, quia tamen eo
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dem tempore multa attingit, efficit ut multa ſimul
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incendantur & dilatentur, ſicque magnâ vi tormen
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tum explodant. </
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>Ita carbonis reſiſtentia valde
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celeritatem, quà nitri particulae in flammam erum
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punt; & granorum diſtinctio neceſſaria eſt, ut ſatis
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magnos circa ſe habeant meatus, per quos flamma
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pulveris primùm accenſi ad multas pulveris reſidui
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partes liberè accedat.
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CXV.
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De granis hujus pul
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veris, & in quo prae
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cipua ipſius vis con
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ſiſtat. </
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Poſt illum ignem, qui omnium minimè durabilis
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eſt, conſideremus an dari poſſit aliquis alius, qui è
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contrà ſine ullo alimento diutiſſimè perſeveret: ut
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narratur de lucernis quibuſdam, quae aliquando in
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hypogaeis, ubi mortuorum corpora ſervabantur,
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multos annos inventae ſunt accenſae a. </
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ſubterraneo & arctiſſimè clauſo, ubi nullis vel mini
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mis ventis ae
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r unquam commovebatur, potuit for
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taſſe contingere, ut multae ramoſae fuliginis particulae
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circa flammam lucernae colligerentur, quae ſibi
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incumbentes manerent immotae, atque ita exiguum
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quaſi fornicem componentes, ſufficerent ad impedien
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dum, ne ae
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r circumjacens iſtam flammam obrueret ac </
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