Descartes, René, Renati Des-Cartes principia philosophiae

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                <pb pagenum="282"/>
              tat, nimis arctè compacta, ut locis ſuis planè extrudi
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              poſſint: mollitur tamen, quia omnes ejus particulae
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              calore concutiuntur; & poſtea ſi lentè refrigeretur,
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              non reſumit priorem duritiem, nec rigorem, nec fra­
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              gilitatem, ſed fit flexile inſtar ferri vilioris. </s>
              <s>Dum
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              hoc pacto refrigeratur, ramenta anguloſa & confra­
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              goſa, quae grumulorum ſuperficiebus ad interiores
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              eorum partes vi caloris protruſa erant, foras ſe exſe­
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              runt, & una aliis implicata, tanquam uncis quibuſdam
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              perexiguis unos grumulos aliis annectunt: quo ſit,
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              ramenta iſta non ampliùs tam arcte in grumulis ſuis
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              compacta ſint, atque ut grumuli non ampliùs imme­
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              diato contactu, ſed tanquam hamis vel uncis quibuſ­
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              dam alligati, ſibi mutuò adhaereant; & ideò chalybs
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              non admodum durus, nec rigidus, nec fragilis,
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              mollis & flexilis evadat. </s>
              <s>In quo non differt à ferro
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              communi, niſi quòd chalybi iterum candeſado, &
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              deinde celeriter reſrigerato, prior durities & rigidi­
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              tas reddatur, non autem ferro, ſaltem tanta. </s>
              <s>Cujus
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              ratio eſt, quòd ramenta in chalybe non tam
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              abſint à ſitu ad maximam diuritiem convenienti, quin
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              facilè illum ignis vi reſumant, & in celerrimà refrige­
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              ratione retineant: cùm autem in ferro talem ſitum
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              nunquam habuerint, nunquam etiam illum reſumunt. </s>
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              Et quidem, ut ita chalybs aut ferrum
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              celerri­
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              mè refrigeretur, in aquam alioſve liquores frigidos
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              mergi ſolet; ac contrà in oleum vel alia pinguia, ut
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              lentiùs frigeſcat. </s>
              <s>Et quia, quò durior & rigidior, eò
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              etiam fragilior evadit, ut gladii, ferrae, limae, aliave
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              inſtrumenta ex eo fiant, non ſemper in
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              li­
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              quoribus exſtingui debet, ſed in temperatis, prout in </s>
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