Descartes, René
,
Renati Des-Cartes principia philosophiae
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mediam Terrae regionem M, quae ex materiâ iſtis ma
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culis ſimili conflata eſt, non ubique eſſe aequaliter
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denſam; & ideò quibuſdam in locis tranſitum praebere
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majori copiae primi elementi, quàm in reliquis; atque
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hanc materiam primi elementi, per corpus
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tran
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ſeuntem, eius partes quibuſdam in locis fortiùs quàm
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in aliis commovere, ſicuti etiam calor à Solis radiis
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excitatus, atque, ut ſuprà dictum eſta, uſque ad intima
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Terrae pertingens, non uniformiter agit in hoc cor
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pus C, quia faciliùs ei communicatur per
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corporis E, quam per aquam D: atque altitudo mon
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tium efficit, ut quaedam Terrae partes Soli obverſae,
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multò magis incaleſcant, quàm ab illo averſae: ac
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denique aliter incaleſcunt verſus AEquatorem, aliter
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verſus polos, calorque iſte per vices variatur
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viciſſitudinem tum diei & noctis, tum praecipuè aeſtatis
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­emis. </
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LIX.
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De inaequalitate calo
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ris interiorem Ter
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ram pervadentis. </
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Unde fit, ut omnes particulae hujus terrae interioris
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C ſemper aliquantulum, & modò plus modò minùs
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moveantur; non eae ſolùm quae vicinis non
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