Descartes, René
,
Renati Des-Cartes principia philosophiae
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cauſſae .poſſunt excogitari; ſed an earum effectus ſit
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tantus, ut ſenſu deprehendatur, nondum mihi com
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pertum eſt. </
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XXVII.
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Gravitatem corpora
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deprimere verſus cen
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trum Terrae.</
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25</
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Vis luminis, quatenus à Sole ac ſtellis in omnes
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coeli partes ſe diffundit, jam ſatis ſuprà fuit expli
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cata a: ſupereſt tantùm ut hîc notemus, ejus radios à
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Sole delapſos, Terrae particulas diverſimodè agitare. </
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Quippe, quamvis in ſe ſpectata, nihil aliud ſit quàm
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preſſio quaedam, quae ſit ſecundùm lineas rectas, à
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Sole in Terram extenſas: quia tamen iſta preſſio non
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aequaliter omnibus particulis tertii elementi, quae ſu
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premam terrae regionem componunt, ſed nunc unis,
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nunc aliis, ac etiam, nunc uni ejuſdem particulae ex
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tremitati nunc alteri applicatur: facilè poteſt intel
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ligi, quo pacto ex ipſâ variae motiones in particulis
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iſtis excitentur. </
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>Exempli cauſſâ, ſi AB ſit una ex par
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ticulis tertii elementi,
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terrae regionem componentibus,
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quae incumbat alteri particulae C,
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atque inter ipſam & Solem aliae
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multae interjaceant, ut D, E, F:
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hae interjacentes nunc impedient,
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ne radii Solis G, G, premant ex
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tremitatem B, non autem ne pre
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mant A: ſicque extremitas A de
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primetur, atque allia B attolletur. </
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Et quia iſtae particulae aſſiduè ſi
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tum mutant, paullò pòſt opponentur radiis Solis ten
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dentibus verſus A, non autem aliis tendentibus verſus
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B, ſicque extremitas A rurſus attolletur, & B </
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