Galilei, Galileo
,
The systems of the world
,
1661
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and others more ſlowly than the ſimple; as for example, Lead, and
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Wood, in compariſon of earth; and therefore amongſt theſe
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tions, which call you the ſimple, and which the mixt?</
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<
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>SIMPL. </
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>I would call that ſimple motion, which is made by a
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ſimple body, and mixt, that of a compound body.</
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<
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>SAGR. </
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<
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>Very well, and yet
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Simplicius
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a little before you ſaid,
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that the ſimple, and compound motions, diſcovered which were
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mixt, and which were ſimple bodies; now you will have me by
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ſimple and mixt bodies, come to know which is the ſimple, and
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which is the compound motion: an excellent way to keep us
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rant, both of motions and bodies. </
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<
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>Moreover you have alſo a little
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above declared, how that a greater velocity did not ſuffice, but
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you ſeek a third condition for the definement of ſimple motion, for
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which
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Ariſtotle
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contented himſelf with one alone, namely, of the
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ſimplicity of the Space, or
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Medium
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: But now according to you,
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the ſimple motion, ſhall be that which is made upon a ſimple line,
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with a certain determinate velocity, by a body ſimply moveable.
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<
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>Now be it as you pleaſe, and let us return to
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Ariſtotle,
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who
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neth the mixt motion to be that compounded of the right, and
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cular, but produceth not any body, which naturally moveth with
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ſuch a motion.</
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<
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>SALV. </
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<
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>I come again to
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Ariſtotle,
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who having very well, and
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Methodically begun his diſcourſe, but having a greater aim to
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reſt at, and hit a marke, predefigned in his minde, then that to
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which his method lead him, digreſſing from the purpoſe, he comes
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to aſſert, as a thing known and manifeſt, that as to the motions
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directly upwards or downwards, they naturally agree to Fire, and
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Earth; and that therefore it is neceſſary, that beſides theſe bodies,
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which are neer unto us, there muſt be in nature another, to which
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the circular motion may agree: which ſhall be ſo much the more
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excellent by how much the circular motion is more perfect, then the
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ſtreight, but how much more perfect that is than this, he
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mines from the greatneſs of the circular lines perfection above the
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right line; calling that perfect, and this imperfect; imperfect,
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cauſe if infinite it wanteth a termination, and end: and if it be
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nite, there is yet ſomething beyond which it may be prolonged.
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<
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>This is the baſis, ground work, and maſter-ſtone of all the Fabrick
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of the
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Aristotelian
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World, upon which they ſuperſtruct all their
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other properties, of neither heavy nor light, of ingenerable
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ruptible, exemption from all motions, ſome onely the local, &c.
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<
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>And all theſe paſſions he affirmeth to be proper to a ſimple body
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that is moved circularly; and the contrary qualities of gravity,
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levity, corruptibility, &c. </
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<
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>he aſſigns to bodies naturally moveable
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in a ſtreight line, for that if we have already diſcovered defects in
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the foundation, we may rationally queſtion what ſoever may </
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