Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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not move, and ſo he ſhall not be bound to ſhew how that in
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cending it continueth all the way vertically over one point, for
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that it will not do any ſuch thing.</
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<
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>SIMP. </
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>Very well; But if grave bodies, and light can have no
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principle, either internal or external of moving circularly, than
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neither can the terreſtrial Globe move with a circular motion: and
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thus you have the intent of the Author.</
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>SALV. </
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>I did not ſay, that the Earth had no principle, either
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interne, or externe to the motion of gyration, but I ſay, that I do
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not know which of the two it hath; and yet my not knowing it
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hath not a power to deprive it of the ſame; but if this Author
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can tell by what principle other mundane bodies are moved round,
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of whoſe motion there is no doubt; I ſay, that that which
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keth the Earth to move, is a vertue, like to that, by which
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Mars
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and
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Jupiter
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are moved, and wherewith he believes that the ſtarry
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Sphere it ſelf alſo doth move; and if he will but aſſure me, who is
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the mover of one of theſe moveables, I will undertake to be able
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to tell him who maketh the Earth to move. </
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<
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>Nay more; I will
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undertake to do the ſame, if he can but tell me, who moveth the
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parts of the Earth downwards.</
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<
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>SIMP. </
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<
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>The cauſe of this is moſt manifeſt, and every one knows
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that it is gravity.</
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<
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>You are out,
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Simplicius,
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you ſhould ſay, that every
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one knowes, that it is called Gravity: but I do not queſtion you
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about the name, but the eſſence of the thing, of which eſſence
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you know not a tittle more than you know the eſſence of the
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mover of the ſtars in gyration; unleſſe it be the name that hath
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been put to this, and made familiar, and domeſtical, by the many
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experiences which we ſee thereof every hour in the day,: but not
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as if we really underſtand any more, what principle or vertue that
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is which moveth a ſtone downwards, than we know who moveth
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it upwards, when it is ſeparated from the projicient, or who
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veth the Moon round, except (as I have ſaid) onely the name,
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which more particularly and properly we have aſſigned to the
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tion of deſcent, namely, Gravity; whereas for the cauſe of
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cular motion, in more general termes, we aſſign the
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Vertue
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ſed,
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and call the ſame an
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Intelligence,
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either aſſiſting, or informing;
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and to infinite other motions we aſcribe Nature for their cauſe.</
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We know no more
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who moveth grave
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bodies downwards;
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than who moveth
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the Stars round,
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nor know we any
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thing of theſe
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ſes, more than the
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names impoſed on
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them by us.
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<
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>SIMP. </
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<
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>It is my opinion, that this Author asketh far leſſe than
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that, to which you deny to make anſwer; for he doth not ask
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what is nominally and particularly the principle that moveth
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grave and light bodies circularly, but whatſoever it be, he
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reth to know, whether you think it intrinſecal, or extrinſecal:
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For howbeit,
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v. </
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<
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>gr.
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I do not know, what kind of thing that gravity
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is, by which the Earth deſcendeth; yet I know that it is an intern </
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</
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