Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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body that moveth, one of its extreams ſtanding ſtill without
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ching place, the motion muſt needs be circular, and no other: and
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becauſe in the living creatures moving, one of its members doth
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not ſeparate from the other its conterminal, therefore that motion
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is of neceſſity circular.</
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The Flexures in
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animals are not
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made for the
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verſity of motions.
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The motions of
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animals are of one
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ſort.
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The ends of the
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bones are all
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tund.
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It is
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ted, that the ends
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of the bones are of
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neceſſity to be
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tund.
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The motions of
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animals are all
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circular.
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>SIMP. </
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>How can this be? </
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>For I ſee the animal move with an
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hundred motions that are not circular, and very different from one
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another, as to run, to skip, to climbe, to deſcend, to ſwim, and
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many
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Secondary
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ons of animals
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pendent on the firſt
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>SALV. </
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>Tis well: but theſe are ſecondary motions, depending
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on the preceding motions of the joynts and flexures. </
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plying of the legs to the knees, and the thighs to the hips, which
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are circular motions of the parts, is produced, as conſequents, the
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skip, or running, which are motions of the whole body, and theſe
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may poſſibly not be circular. </
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>Now becauſe one part of the ter</
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reſtrial Globe is not required to move upon another part
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able, but that the motion is to be of the whole body, there is no
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need in it of flexures.</
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The
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Terreſtriall
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Globe
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hath noe
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need of flexures.
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>SIMP. </
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>This (will the aduerſary rejoyn) might be, if the
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on were but one alone, but they being three, and thoſe very
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ferent from each other, it is not poſſible that they ſhould concur in
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an ^{*} articulate body.</
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* Without joynts</
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>SALV. </
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>I verily believe that this would be the anſwer of the
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Philoſopher. </
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>Againſt which I make oppoſition another way; and
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ask you, whether you think that by way of joynts and flexures one
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may adapt the terreſtrial Globe to the participation of three
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rent circular motions? </
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<
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>Do you not anſwer me? </
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>Seeing you are
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ſpeechleſſe, I will undertake to anſwer for the Philoſopher, who
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would abſolutely reply that they might; for that otherwiſe it
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would have been ſuperfluous, and beſides the purpoſe to have
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poſed to conſideration, that nature maketh the flexions, to the
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end, the moveable may move with different motions; and that
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therefore the terreſtrial Globe having no flexures, it cannot have
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thoſe three motions which are aſcribed to it. </
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>For if he had
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thought, that neither by help of flexures, it could be rendered apt
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for ſuch motions, he would have freely affirmed, that the Globe
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could not move with three motions. </
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<
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>Now granting this, I intreat
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you, and by you, if it were poſſible, that Philoſopher,
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thor of the Argument, to be ſo courteous as to teach me in what
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manner thoſe flexures ſhould be accommodated, ſo that thoſe
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three motions might commodiouſly be excerciſed; and I grant you
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four or ſix moneths time to think of an anſwer. </
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<
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>As to me, it
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eth that one principle onely may cauſe a plurality of motions in
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the Terreſtrial Globe, juſt in the ſame manner that, as I told you
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before, one onely principle with the help of various inſtruments </
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