Galilei, Galileo
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The systems of the world
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1661
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diſtinct that can be poſſible; and excuſe me
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Sagredus,
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if haply
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with ſome tediouſneſs you hear me oft repeat the ſame things,
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and fancie that you ſee me reaſſume my argument in the
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lick circle of Diſputations. </
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>You ſay Generation and
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on are onely made where there are contraries; contraries
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are onely amongſt ſimple natural bodies, moveable with contrary
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motions; contrary motions are onely thoſe which are made by
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a right line between contrary terms; and theſe are onely two,
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that is to ſay, from the
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medium,
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and towards the
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medium
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; and
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ſuch motions belong to no other natural bodies, but to the
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Earth,
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the
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Fire,
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and the other two Elements: therefore Generation
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and Corruption is onely amongſt the Elements. </
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<
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>And becauſe
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the third ſimple motion, namely, the circular about the
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medium,
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hath no contrary, (for that the other two are contraries, and one
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onely, hath but onely one contrary) therefore that natural body
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with which ſuch motion agreeth, wants a contrary; and having
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no contrary is ingenerable and incorruptible, &c. </
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<
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there is no contrariety, there is no generation or corruption,
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&c.
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But ſuch motion agreeth onely with the Cœleſtial bodies;
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fore onely theſe are ingenerable, incorruptible,
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&c.
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And to
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begin, I think it a more eaſie thing, and ſooner done to reſolve,
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whether the Earth (a moſt vaſt Body, and for its vicinity to us,
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moſt tractable) moveth with a ſpeedy motion, ſuch as its
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lution about its own axis in twenty four hours would be, than it
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is to underſtand and reſolve, whether Generation and Corruption
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ariſeth from contrariety, or elſe whether there be ſuch things as
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generation, corruption and contrariety in nature. </
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<
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>And if you,
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Simplicius,
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can tell me what method Nature obſerves in working,
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when ſhe in a very ſhort time begets an infinite number of flies
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from a little vapour of the Muſt of wine, and can ſhew me which
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are there the contraries you ſpeak of, what it is that corrupteth,
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and how; I ſhould think you would do more than I can; for I
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profeſs I cannot comprehend theſe things. </
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>Beſides, I would
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ry gladly underſtand how, and why theſe corruptive contraries are
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ſo favourable to Daws, and ſo cruel to Doves; ſo indulgent to
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Stags, and ſo haſty to Horſes, that they do grant to them many
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more years of life, that is, of incorruptibility, than weeks to theſe.
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<
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>Peaches and Olives are planted in the ſame ſoil, expoſed to the
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ſame heat and cold, to the ſame wind and rains, and, in a word,
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to the ſame contrarieties; and yet thoſe decay in a ſhort time,
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and theſe live many hundred years. </
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<
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>Furthermore, I never was
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thorowly ſatisfied about this ſubſtantial tranſmutation (ſtill
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ing within pure natural bounds) whereby a matter becometh ſo
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transform'd, that it ſhould be neceſſarily ſaid to be deſtroy'd, ſo
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that nothing remaineth of its firſt being, and that another body </
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