Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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and thinne Figures: If all indifferently, then every Body ſhall reſt:
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becauſe every Body hath ſome Figure, which is falſe: but if ſome
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particular Figures only may be in ſome manner a Cauſe of Reſt, as,
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for Example, the broad, then the others would be in ſome manner
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the Cauſes of Motion: for if from ſeeing ſome Bodies of a contracted
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Figure move, which after dilated into Plates reſt, may be inferred,
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that the Amplitude of Figure hath a part in the Cauſe of that Reſt;
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ſo from ſeeing ſuch like Figures reſt, which afterwards contracted
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move, it may with the ſame reaſon be affirmed, that the united and
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contracted Figure, hath a part in cauſing Motion, as the remover of
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that which impeded it: The which again is directly oppoſite to what
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Ariſtotle
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ſaith, namely, that Figures are not the Cauſes of Motion.
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>Beſides, if
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Ariſtotle
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had admitted and not excluded Figures from
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ing Cauſes of not moving in ſome Bodies, which moulded into
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ther Figure would move, he would have impertinently propounded
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in a dubitative manner, in the words immediately following, whence
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it is, that the large and thinne Plates of Lead or Iron, reſt upon the
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water, ſince the Cauſe was apparent, namely, the Amplitude of
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Figure. </
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>Let us conclude, therefore, that the meaning of
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Ariſtotle
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in this place is to affirm, that Figures are not the Cauſes of abſolutely
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moving or not moving, but only of moving ſwiftly or ſlowly: which
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we ought the rather to believe, in regard it is indeed a meſt true
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ceipt and opinion. </
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>Now the mird of
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Ariſtotle
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being ſuch, and
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pearing by conſequence, rather contrary at the firſt ſight, then
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vourable to the aſſertion of the Oponents, it is neceſſary, that their
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Interpretation be not exactly the ſame with that, but ſuch, as being
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in part underſtood by ſome of them, and in part by others, was ſet
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down: and it may eaſily be indeed ſo, being an Interpretation
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conſonent to the ſence of the more famous Interpretors, which is,
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that the Adverbe
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Simply
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or
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Abſolutely,
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put in the Text, orght not to
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be joyned to the Verbe to
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Move,
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but with the Noun
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Cauſes
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: ſo that
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the purport of
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Ariſtotles
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words, is to affirm, That Figures are not the
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Cauſes abſolutely of moving or not moving, but yet are Cauſes
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cundum quid, viz
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in ſome ſort; by which means, they are called
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Auxiliary and Concomitant Cauſes: and this Propoſition is received
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and aſſerted as true by
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Signor Buonamico Lib.
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5.
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Cap.
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28. where he
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thus writes.
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There are other Cauſes concomitant, by which ſome
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things float, and others ſink, among which the Figures of Bodies hath
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the firſt place,
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&c.</
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Lib. 4. Cap. 61
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Text. </
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>42.</
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>Concerning this Propoſition, I meet with many doubts and
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culties, for which me thinks the words of
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Ariſtotle
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are not capable of
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ſuch a conſtruction and ſence, and the difficulties are theſe.</
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>Firſt in the order and diſpoſure of the words of
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Ariſtotle,
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the
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ticle
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Simpliciter,
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or if you will
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abſoluté,
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is conjoyned with the Verb </
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