Descartes, René
,
Renati Des-Cartes principia philosophiae
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erumpunt; unde fit, ùt montes nonnulli crebris ejuſ
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modi incendiis ſint inſames, ut AEtna Siciliae, Veſuvius
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Campaniae, Hecla Iſlandiae, &c. </
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LXXVIII.
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Cur ex quibuſdam
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montibus ignis erum
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pat. </
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Denique, durat aliquando terrae-motus per aliquot
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horas, aut dies; quia non una tantùm continua cavi
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tas eſſe ſolet, in quâ pingues & inflammabiles fumi
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colliguntur, ſed plures diverſae, terrâ multo ſulphure
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aut bitumine ſaturâ disjunctae; cùmque exhalatio in
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unis accenſa terram ſemel concuſſit, aliqua mora in
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to tercedit, priuſquam flamma, per meatus ſulphure op
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pletos, ad alias poſſit pervenire. </
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LXXIX.
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Cur plures concuſſio
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nes fieri ſoleant in
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terrae motu: ſicque
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per aliquot horas aut
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dies interdum duret. </
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Sed hîc ſupereſt ut dicam, quo pacto in iſtis cavi
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tatibus flamma poſſit accendi, ſimulque ut explicem
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ignis naturam. </
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>Particulae terreſtres, cujuſcumque ſint
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magnitudinis aut figurae, cùm ſingulae ſeorſim primi
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elementi motum ſequuntur, ignis formam habent; ut
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etiam habent ae
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ris formam, cùm inter globulos ſecun
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di elementi volitantes, eorum agitationem imitantur. </
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Sicque prima & praecipua inter ae
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rem & ignem diffe
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rentia eſt, quòd multò celeriùs hujus quàm illius par
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ticulae agitentur. </
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>Jam enim ſuprà ſatis oſtenſum eſt,
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motum materiae primi elementl multò celeriorem eſſe
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quàm ſecundi. </
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>Sed alia etiam eſt permagna differentia,
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quòd etſi craſſiores tertii elementi particulae, quales
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ſunt eae quibus conſtant vapores argenti vivi, poſſint
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ae
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ris ſormam induere, non tamen ad ejus conſervatio
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nem ſint neceſſariae, ac contrà ille purior ſit, minuſ
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que corruptioni obnoxius, cùm ſolis minutiſſimis par
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ticulis conſtat. </
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>Craſſiores enim, niſi calore continuo
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agitentur, pondere ſuo deorſum labentes, ſpontè exu
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unt ejus formam. </
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>Ignis autem, ſine craſſiuſculis </
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