Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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to move,
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and ſeperated from the Noun
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Cauſes,
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the which is a great
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preſumption in my favour, ſeeing that the writing and the Text
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ſaith, Figures are not the Cauſe of moving ſimply upwards or
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downwards, but of quicker or ſlower Motion: and, ſaith not,
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Figures are not ſimply the Cauſes of moving upwards or
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wards, and when the words of a Text receive, tranſpoſed, a ſence
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different from that which they found, taken in the order wherein
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the Author diſpoſeth them, it is not convenient to inverte them.
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>And who will affirm that
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Ariſtotle
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deſiring to write a Propoſition,
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would diſpoſe the words in ſuch ſort, that they ſhould import a
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different, nay, a contrary ſence? </
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>contrary, I ſay, becauſe
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ſtood as they are written; they ſay, that Figures are not the
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Cauſes of Motion, but inverted, they ſay, that Figures are the
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Cauſes of Motion, &c.</
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>Moreover, if the intent of
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Aristotle
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had been to ſay, that Figures
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are not ſimply the Cauſes of moving upwards or downwards, but
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only Cauſes
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Secundum quid,
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he would not have adjoyned thoſe
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words,
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but they are Cauſes of the more ſwift or ſlow Motion
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; yea, the
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ſubjoining this would have been not only ſuperfluous but falſe, for
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that the whole tenour of the Propoſition would import thus much.
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<
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>Figures are not the abſolute Cauſes of moving upwards or
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wards, but are the abſolute Cauſe of the ſwift or ſlow Motion;
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which is not true: becauſe the primary Cauſes of greater or leſſer
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Velocity, are by
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Ariſtotle
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in the 4th of his
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Phyſicks, Text.
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71.
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buted to the greater or leſſer Gravity of Moveables, compared
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mong themſelves, and to the greater or leſſer Reſiſtance of the
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Medium's,
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depending on their greater or leſs Craſſitude: and theſe
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are inſerted by
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Ariſtotle
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as the primary Cauſes; and theſe two only
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are in that place nominated: and Figure comes afterwards to be
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conſidered,
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Text.
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74. rather as an Inſtrumentall Cauſe of the force
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of the Gravity, the which divides either with the Figure, or with
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the
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Impetus
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; and, indeed, Figure by it ſelf without the force of
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Gravity or Levity, would opperate nothing.</
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<
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>Iadde, that if
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Ariſtotle
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had an opinion that Figure had been in
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ſome ſort the Cauſe of moving or not moving, the inquiſition
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which he makes immediately in a doubtfull manner, whence it
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comes, that a Plate of Lead flotes, would have been impertinent;
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for if but juſt before he had ſaid, that Figure was in a certain ſort
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the Cauſe of moving or not moving, he needed not to call in
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Queſtion, by what Cauſe the Plate of Lead ſwims, and then
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bing the Cauſe to its Figure; and framing a diſcourſe in this manner.
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<
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>Figure is a Cauſe
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Secundum quid
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of not ſinking: but, now, if it be
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doubted, for what Cauſe a thin Plate of Lead goes not to the bottom;
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it ſhall be anſwered, that that proceeds from its Figure: a diſcourſe </
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