Galilei, Galileo
,
The systems of the world
,
1661
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<
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>SIMPL. </
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<
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>And who ſaith that I cannot draw other lines? </
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<
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>why
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may not I protract another line underneath, unto the point A,
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that may be perpendicular to the reſt?</
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<
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>SALV. </
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<
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>You can doubtleſs, at one and the ſame point, make no
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more than three right lines concurre, that conſtitute right angles
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between themſelves.</
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<
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>SAGR. </
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<
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>I ſee what
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Simplicius
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means, namely, that ſhould the
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ſaid D A be prolonged downward, then by that means there might
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be drawn two others, but they would be the ſame with the firſt
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three, differing onely in this, that whereas now they onely touch,
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then they would interſect, but not produce new
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In phyfical proofs
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geometrical
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neſs is not
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ry.
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<
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>SIMPL. </
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>I will not ſay that this your argument may not be
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cludent; but yet this I ſay with
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Ariſtotle,
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that in things natural
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it is not alwaies neceſſary, to bring
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Mathematical
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demonſtrations.</
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<
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>SAGR. </
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<
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>Grant that it were ſo where ſuch proofs cannot be had,
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yet if this caſe admit of them, why do not you uſe them? </
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<
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>But it
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would be good we ſpent no more words on this particular, for I
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think that
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Salviatus
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will yield, both to
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Ariſtotle,
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and you,
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out farther demonſtration, that the World is a body, and perfect,
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yea moſt perfect, as being the greateſt work of God.</
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<
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>SALV. </
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<
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>So really it is, therefore leaving the general contempla</
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tion of the whole, let us deſcend to the conſideration of its parts,
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which
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Ariſtotle,
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in his firſt diviſion, makes two, and they very
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rent and almoſt contrary to one another; namely the Cœleſtial,
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and Elementary: that ingenerable, incorruptible, unalterable,
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paſſible, &c. </
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<
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>and this expoſed to a continual alteration,
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on, &c. </
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<
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>Which difference, as from its original principle, he
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rives from the diverſity of local motions, and in this method he
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proceeds.</
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Parts of the world
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are two, according
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to
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Ariſtotle,
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ſtial and
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tary contrary to
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one another.
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<
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>Leaving the ſenſible, if I may ſo ſpeak, and retiring into the
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Ideal world, he begins Architectonically to conſider that nature
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being the principle of motion, it followeth that natural bodies be
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indued with local motion. </
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<
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>Next he declares local motion to be
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of three kinds, namely, circular, right, and mixt of right and
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cular: and the two firſt he calleth ſimple, for that of all lines the
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circular, and right are onely ſimple; and here ſomewhat
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ſtraining himſelf, he defineth anew, of ſimple motions, one to be
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circular, namely that which is made about the
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medium,
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and the
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other namely the right, upwards, and downwards; upwards, that
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which moveth from the
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medium
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; downwards, that which goeth
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wards the
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medium.
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And from hence he infers, as he may by and
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ceſſary conſequence, that all ſimple motions are confined to theſe
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three kinds, namely, to the
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medium,
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from the
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medium,
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and about
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the
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medium
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; the which correſponds ſaith he, with what hath been
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ſaid before of a body, that it alſo is perfected by three things, and ſo </
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