Descartes, René
,
Renati Des-Cartes principia philosophiae
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corporum terreſtrium liquidorum, particulas tertii ele
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menti ſibi obvias aſſidu loco expellunt, donec eas in
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ter aliquas alias ita diſpoſuerint & ordinâ rint, ut non
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magis quàm iſtae aliae ipſorum motibus obſiſtant, vel,
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cùm ita diſponi non poſſunt, donec eas à reliquis ſe
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gregârint. </
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>Sic videmus ex muſto faeces quaſdam, non
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modò ſurſum & deorſum (quod gravitati & levitati tri
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bui poſſet), ſed etiam verſus vaſis latera expelli, vi
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numque poſtea defaecatum, quamvis adhuc ex variis
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particulis conſtans, eſſe pellucidum, & non denſius
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aut craſſius in imo quàm in ſummo apparere. </
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de caeteris liquoribus puris eſt exiſtimandum. </
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XVIII.
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De ſecundo iſtius pri
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mae actionis effectu:
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quòd una corpora ab
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aliis ſecernat, & li
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quores expurget. </
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25</
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5</
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Tertius effectus globulorum coeleſtium eſt, quòd
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aquae aliorumve liquorum guttas in ae
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re, aliove liquore
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ab iis diverſo, pendentes, reddant rotundas, ut jam in
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Meteoris explicui a. </
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>Cùm enim iſti globuli coeleſtes
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longè alias habeant vias in aquae guttâ quàm in ae
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re
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circumjacente, ſemperque quantum poſſunt ſecundùm
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lineas redas, vel ad redas quam-proxim accedentes,
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rnoveantur: maniſeſtum eſt illos qui ſunt in ae
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àre, ob
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jectu aqueae guttae minùs impediri à motibus ſuis,
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ſecundùm lineas à redis quam-minimùm deflectentes,
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continuandis, ſi ea ſit perfectè ſphaerica, quàm ſi quam
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cunque aliam figuram fortèiatur. </
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>Si quae enim ſit pars in
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ſuperficie iſtius guttae, quae ultra figuram ſphaericam
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promineat, majori vi globuli coeleſtes per ae<25>rem diſ
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currentes in illam impingent, quàm in caeteras, ideoque
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ipſam verſus centrum guttae protrudent; ac ſi quae pars
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ejus, ſuperficiei centro vicinior ſit quàm reliquae, glo
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buli coeleſtes, in ipſà guttâ contenti, majori vi eam à </
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