Descartes, René
,
Renati Des-Cartes principia philosophiae
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quia iſtae particulae valde exiguae ſunt, reſpectu glo
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bulorum coeleſtium in quos impingunt, ac etiam ali
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quantò tardiùs, quàm reliqua materia primi elementi,
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moventur; ſed praecipuè quia illae quae ab uno polo
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veniunt non magis iſtos globulos in unam
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propellunt, quàm aliae, ex alio polo venientes, in
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adverſam. </
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CX.
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Quod lumen ſtellae per
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maculam vix poſſit
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tranſire. </
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10</
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Materia autem coeleſtis in toto vortice, hoc ſidus I
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circumjacente, comprehenſa, ſuas interim vires poteſt
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retinere, quamvis fortè illae non ſufficiant ad
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luminis in oculis noſtris excitandum: fierique poteſt
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ut interim iſte vortex praevaleat aliis vorticibus ſibi
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vicinis, & forteiùs illos premat quàm ab ipſis prematur. </
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Unde ſequeretur ſidus I augeri debere, niſi macula
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deſg
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, illud circumſcribens, id impediret. </
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circumferentia vorticis I ſit AYBM, putandum eſt ejus
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globulos, circumferentiae iſti proximos, eandem ha
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bere vim ad progrediendum ultra ipſam, verſus alios
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vortices circumpoſitos, ac globulos horum vorticum
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ad progrediendum verſus I, non majorem
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mino
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rem: haec enim unica ratio eſt, cur eius circumferen
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tia ibi potiùs quàm alibi terminictur. </
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>Si autem, caeteris
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immutatis contingat ut minuatur illa vis quâ, exem
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pli cauſâ, materia vorticis O tendit verſùs I (hocque
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variis ex cauſis poteſt contingere, ut ſi ejus materia
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alios vortices tranſeat, vel multae maculae circa ſidus
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in O exiſtens generentur, &c.), neceſſe eſt, ex legibus
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naturae, ut globuli vorticis I, qui ſunt in circumferen
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tiâ Y, ultra ipſam pergant verſùs P; & quia reliqui
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omnes, qui ſunt inter I & Y, eo verſùs etiam tendunt,
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inde augeretur ſpatium in quo eſt ſidus I, niſi macula </
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