Descartes, René
,
Renati Des-Cartes principia philosophiae
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hactenus circa magnetem verè ac pro certo fuiſſe ob
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ſervatum, cujus ratio, ex iis quae explicui, non facilè
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intelligatur. </
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>Hîc autem occaſione magnetis qui trahit ferrum,
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aliquid addendum eſt de ſuccino, gagate, cerâ, reſinâ,
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vitro & ſimilibus, quae omnia minuta corpora etiam
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trahunt. </
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>Quamvis enim mei non ſit inſtituti, particu
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laria ulla explicare, niſi quatenus requiruntur ad ge
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neraliora, de quibus egi, confirmanda; nec examinare
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poſſim iſtam vim in gagate vel ſuccino, niſi priùs ex
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variis experimentis plures alias eorum proprietates
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deducam, & ita intimam ipſorum naturam inveſtigem:
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quia tamen eadem vis in vitro etiam eſt, de quo mihi
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paullò antèa fuit agendum ad ignis effectus demon
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ſtrandos, niſi eam explicarem, alia forſan quae de illo
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ſcripſi, poſſent in dubium revocari. </
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>Praeſertim quia
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fortè nonnulli, videntes iſtam vim in ſuccino, cerâ,
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reſinâ, & oleagineis ferè omnibus reperiri, putabunt
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ipſam in eo conſiſtere, quòd tenues quaedam & ramo
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ſae iſtorum corporum particu1ae, frictione commotae
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(frictio enim ad illam vim excitandam requiri ſolet),
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per ae*rem vicinum ſe diffundant, ac ſibi mutuò adhae
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reſcentes protinus revertantur, & minuta corpora quae
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in itinere offendunt, ſecum trahant. </
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>Quemadmodum
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videmus ejuſmodi pinguium liquefactorum guttas,
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bacillo appenſas, levi motu ita excuti poſſe, ut unâ
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earum parte bacillo adhaerente, alia pars ad aliquam
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diſtantiam ab eo recedat, ſtatimque revertatur, nec
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non feſtucas, aliave obvia corpuſcula ſecum adducat.
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Nihil enim tale in vitro licet imaginari, ſaltem ſi </
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