Borro, Girolamo, De motu gravium et levium, 1575

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                <s id="s.000805">Medium ſimplicia elementorum corpora mouent
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                & eſt quarta propoſitio. </s>
                <s id="s.000806">Cap. XXV.</s>
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                <s id="s.000807">AMEDIO
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                elementa moueri tetigit Ariſtoteles libro
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                tertio de cælo particula vigeſimaoctaua; dum dixit.
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                </s>
                <s id="s.000808">Aer est inſtrumentum motus naturalis, & violenti.
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                </s>
                <s id="s.000809">Quem
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                Auerroes Philoſophus omni laude maior in Para
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                phraſi quam doctissimè intellexit, &
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                diligentissimè expla
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                nauit. </s>
                <s id="s.000810">Ratus est enim Auerroes ab Ariſtotele declarari,
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                quomodo motus,
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                naturalis,
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                violentus fiat. </s>
                <s id="s.000811">Naturalis qui
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                dem (inquit) ab aere iuuatur per motus principium, quod
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                aer ipſæ à naturali mouente ſuſcipit: hæc enim est natura ae­
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                ris, vt motum à mouente acceptum per aliquod tempus conſer
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                uet, licet mouens ab eo ſeiungatur; perinde ac ſi tunc temporis
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                à ſemet ipſo cieretur: &
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                mobile naturale mouetur per
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                principium, quod in ipſo est, ab aere pari ratione iuuatur; ita
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                vt mobile motum magis conſeruet, eumque
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                efficiat;
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                quam ſi ex ſolo ſuo principio, atque motore fieret.
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                Violentus quoque motus interceptum aeris medium amat:
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                idque magis apparet, & magis manifestum eſt, quam in mo­
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                tu naturali: niſi enim hæc aeris facultas eſſet, vt motum ſuſci
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                peret, & ſuſceptum conſeruaret, quousque ſcilicet impetus,
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                ſeu vigor ille, quem à mobili accipit, euaneſcat, fieri
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                poſſet,
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                vt motus violentus perduraret, niſi quam diu mouens ipſum
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                mobile tangeret: nunc autem cum ſenſus iudicio conſtet, mo­
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                bile violentum moueri; etiam tunc cum mobile à mouente di­
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                ſcessit; rationi conſentaneum eſſe creditur, vt motus violentus
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                per medium aerem factus, eiuſdem aeris interceptionem po­
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                ſtulet: non enim aliunde ſagitta poſt ſui ſeparationem ab ar-
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