Descartes, René
,
Renati Des-Cartes principia philosophiae
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CXL.
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Quomodo fuſione fiat
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chalybs, & quòdvis
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ferrum. </
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Et totus liquor, hoc pacto in guttulas ſive grumulos
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distinctus, ſi celeriter frigeſcat, concreſcit in chalybem
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admodùm durum rigidtim & fragilem, fere ut vitrum. </
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Quippe durus eſt, quia conſtat ramentis ſibi mutuò
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arctiſſimè conjunctis; & rigidus hoc eſt, talis ut, ſi
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flectatur, ſpontè redeat ad priorem figuram, quia
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flexione iſtâ ejus ramentorum exiguae ſuperficies non
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disjunguntur, ſed ſoli meatus figuras mutant, ut ſuprà
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de vitro dictum eſt a; denique eſt fragilis, quia gut
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tulae, ſive grumuli, quibus conſtat, ſibi mutuò non
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adhaerent, niſi per ſuperficierum ſuarum contactum;
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atque hîc contactus non niſi in Pauciſſimis &, perexi
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guis locis immediatus eſſe poteſt. </
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CXLI.
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Cur chalybs ſit valde
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durus, rigidus, & fra
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gilis. </
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Non autem omnes glebae aequè aptie ſunt, ut in
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chalybem vertantur; ac etiam illae eaedem, ex quibus
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optimus & duriſſimus chalybs fieri ſolet, vile, tan
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tùm ferrum dant, cùm igne non convenienti fundun
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tur. </
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>Nam, ſi glebae ramenta ſint adeò anguloſa &
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confragoſa, ut ſibi mutuò priùs adhaerent, quàm ſu
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perficies ſuas aptè poſſint ad invicem applicare, atque
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in guttulas diſtingui; vel ſi ignis non ſit ſatis fortèis ad
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liquorem ita in guttulas diſtinguendum, & ramenta
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ipſas componentia ſimul conſtringenda; vel contrà,
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ſi ſit tam fortis, ut iſtorum ramentorum aptum ſitum
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diſturbet: non chalybs, ſed ferrum minùs durum &
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magis flexile habetur. </
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CXLII.
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Quae ſit differentia in
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terchalybem, & aliud
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ferrum. </
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15</
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Ac etiam chalybs jam factus, ſi rurſus igni admo
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veatur, etſi non facilè liqueſcat, quia ejus grumuli
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nimis craſſi ſunt & ſolidi ut ab igne integri movean
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tur, & ramenta quibus unuſquiſque grumulus </
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