Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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wiſe intrinſecall, whereby ſome of thoſe Bodies have an
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Impetus
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of
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flying the Centre, and moving upwards: by Vertue of which
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trinſe call Principle, called by him Levity, the Moveables which have
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that ſame Motion more eaſily penetrate the more ſubtle
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Medium,
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than the more denſe: but ſuch a Propoſition appears likewiſe
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certain, as I have above hinted in part, and as with Reaſons and
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Experiments, I could demonſtrate, did not the preſent Argument
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portune me, or could I diſpatch it in few words.</
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Lib. 4. Cap. 5.</
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>The Objection therefore of
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Ariſtotle
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againſt
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Democritus,
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whilſt
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he ſaith, that if the Fiery aſcending Atomes ſhould ſuſtain Bodies
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grave, but of a diſtended Figure, it would be more obſervable in
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the Air than in the water, becauſe ſuch Corpuſcles move ſwifter in
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that, than in this, is not good; yea the contrary would evene, for
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that they aſcend more ſlowly through the Air: and, beſides their
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moving ſlowly, they aſcend, not united together, as in the water,
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but diſcontinue, and, as we ſay, ſcatter: And, therefore, as
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Democritus
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well replyes, reſolving the inſtance they make not their
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puſh or
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Impetus
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conjunctly.</
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Ariſtotle,
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in the ſecond place, deceives himſelf, whilſt he will
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have the ſaid grave Bodies to be more eaſily ſuſtained by the ſaid
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Fiery aſcending Atomes in the Air than in the Water: not
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ing, that the ſaid Bodies are much more grave in that, than in this,
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and that ſuch a Body weighs ten pounds in the Air, which will not
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in the water weigh 1/2 an ounce; how can it then be more eaſily
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ſuſtained in the Air, than in the Water?</
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>Let us conclude, therefore, that
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Democritus
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hath in this particular
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better Philoſophated than
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Ariſtotle.
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But yet will not I affirm, that
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De-
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mocritus
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hath reaſon'd rightly, but I rather ſay, that there is a
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nifeſt Experiment that overthrows his Reaſon, and this it is, That
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if it were true, that calid aſcending Atomes ſhould uphold a Body,
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that if they did not hinder, would go to the bottom, it would follow,
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that we may find a Matter very little ſuperiour in Gravity to the
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water, the which being reduced into a Ball, or other contracted
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Figure, ſhould go to the bottom, as encountring but few Fiery
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tomes; and which being diſtended afterwards into a dilated and
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thin Plate, ſhould come to be thruſt upwards by the impulſion of a
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great Multitude of thoſe Corpuſcles, and at laſt carried to the very
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Surface of the water: which wee ſee not to happen; Experience
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ſhewing us, that a Body
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v. </
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>gra.
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of a Sphericall Figure, which very
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hardly, and with very great leaſure goeth to the bottom, will reſt
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there, and will alſo deſcend thither, being reduced into whatſoever
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other diſtended Figure. </
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>We muſt needs ſay then, either that in the
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water, there are no ſuch aſcending Fiery Atoms, or if that ſuch there
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be, that they are not able to raiſe and lift up any Plate of a Matter, </
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