Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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the ſaid calid Atomes aſcend with much greater Force and Velocity
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through the Air, than through the water. </
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>And if this be ſo, as I
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ly believe it is, the Objection of
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Ariſtotle
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in my judgement ſeems to
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give occaſion of ſuſpecting, that he may poſſibly be deceived in more
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than one particular: Firſt, becauſe thoſe calid Atomes, (whether
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they be Fiery Corpuſcles, or whether they be Exhalations, or in
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ſhort, whatever other matter they be, that aſcends upwards through
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the Air) cannot be believed to mount faſter through Air, than
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through water: but rather on the contrary, they peradventure move
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more impetuouſly through the water, than through the Air, as hath
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been in part demonſtrated above. </
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>And here I cannot finde the
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ſon, why
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Ariſtotle
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ſeeing, that the deſeending Motion of the ſame
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Moveable, is more ſwift in Air, than in water, hath not advertiſed
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us, that from the contrary Motion, the contrary ſhould neceſſarily
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follow; to wit, that it is more ſwift in the water, than in the Air: for
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ſince that the Moveable which deſcendeth, moves ſwifter through
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the Air, than through the water, if we ſhould ſuppoſe its Gravity
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gradually to diminiſh, it would firſt become ſuch, that deſcending
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ſwiftly through the Air, it would deſcend but ſlowly through the
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water: and then again, it might be ſuch, that deſcending in the
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Air, it ſhould aſcend in the water: and being made yet leſs grave,
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it ſhall aſcend ſwiftly through the water, and yet deſcend likewiſe
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through the Air: and in ſhort, before it can begin to aſcend, though
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but ſlowly through the Air, it ſhall aſcend ſwiftly through the water:
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how then is it true, that aſcending Moveables move ſwifter through
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the Air, than through the water?</
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Democritus
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futed by
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ſtotle,
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text 43.</
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Ariſtotles
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futation of
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mocritus
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refuted
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by the Author.</
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>That which hath made
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Ariſtotle
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believe, the Motion of Aſcent to be
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ſwifter in Air, than in water, was firſt, the having referred the
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Cauſes of ſlow and quick, as well in the Motion of Aſcent, as of
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Deſcent, only to the diverſity of the Figures of the Moveable, and to
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the more or leſs Reſiſtance of the greater or leſſer Craſſitude, or
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rity of the
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Medium
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; not regarding the compariſon of the Exceſſes
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of the Gravities of the Moveables, and of the
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Mediums
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: the which
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notwithſtanding, is the moſt principal point in this affair: for if the
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augmentation and diminution of the Tardity or Velocity, ſhould
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have only reſpect to the Denſity or Rarity of the
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Medium,
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every Body
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that deſcends in Air, would deſcend in water: becauſe whatever
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difference is found between the Craſſitude of the water, and that of
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the Air, may well be found between the Velocity of the ſame
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able in the Air, and ſome other Velocity: and this ſhould be its
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proper Velocity in the water, which is abſolutely falſe. </
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>The other
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occaſion is, that he did believe, that like as there is a poſitive and
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trinſecall Quality, whereby Elementary Bodies have a propenſion
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of moving towards the Centre of the Earth, ſo there is another </
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