Descartes, René
,
Renati Des-Cartes principia philosophiae
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unoquoque ex iſtis inſtrumentis magis minuſve fragi
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litas eſt vitanda quàm durities optanda; & ideò dum
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certis liquoribus ita mergitur, non immeritò dicitur
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temperari. </
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CXLIII.
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Quomodo chalybs tem
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peretur. </
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Quantum autem ad meatus recipiendis particulis
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ſtriatis idoneos, ſatis quidem patet ex dictis a, permul
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tos tam in chalybe quàm in ferro eſſe debere; ac etiam
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eos eſſe in chalybe niagis integros & perfectos, ramu
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lorumque extremitates in ipſorum ſpiris eminentes,
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cùm ſemel in
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unam partem flexae ſunt, non fam facilè
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in contrariam poſſe inflecti, quanquam etiam in hoc
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faciliùs, quàm in magnete ſlectantur; ac denique
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omnes iſtos meatus, non in chalybe aut alio ferro, ut
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in magnete, orificia ſua recipiendis particulis ſtriatis
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ab Auſtro venientibus idonea, in unam partem, & ido
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nea recipiendis aliis à Boreâ venientibus, in contra
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riam convertere; ſed eorum ſitum varium atque in
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certum eſſe debere, propterea quòd ignis agitatione
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turbatur. </
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>Et in breviſſimà illà niorâ, quâ haec ignis
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agitatio frigore ſiſtitur, tot tantùm ex iſtis meatibus
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verſus Auſtrum & Boream converti poſſunt, quot par
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ticulae ſtriatae, à polis Terrae venientes, ſibi tunc tem
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poris per illos viam quaerunt. </
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>Et quia iſtae particulae
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ſtriatae omnibus ferri meatibus multitudine non reſ
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pondent, omne quidem ferrum aliquam vim magneti
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cam accepit ab eo ſitu, quem habuit reſpectu partium
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terrae, cùm ultimò candefactum refriguit, vel etiam ab
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eo in quo diu immotum ſtetit, ſi diu in eodem ſitu ſte
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terit immotum; ſed pro multitudine meatuum quos
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in ſe continet, poteſt habere adhuc majorem. </
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