Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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tures themſelves, which yet move naturally, and from an intern
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principle, do grow weary, and have need of reſt to relax and
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freſh their members --------</
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An explanation
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of the true ſenſe of
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Kepler
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and his
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fence.
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The greatneſſe
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and ſmalneſſe of
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the body make a
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difference in
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on and not in reſt.
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The order of
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ture is to make the
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leſſer Orbs to
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culate in ſhorter
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times, and the
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ger in longer times.
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>SAGR. </
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>Methinks I hear
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Kepler
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anſwer him to that, that
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there are ſome kinde of animals which refreſh themſelves after
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wearineſſe, by rowling on the Earth; and that therefore there
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is no need to fear that the Terreſtrial Globe ſhould tire, nay it
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may be reaſonably affirmed, that it enjoyeth a perpetual & moſt
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tranquil repoſe, keeping it ſelf in an eternal rowling.</
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The feigned
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ſwer of
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Kepler
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vered with an
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tificial Irony.
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<
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>SALV. </
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>You are too tart and Satyrical,
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Sagredus:
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but let us
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lay aſide jeſts, whilſt we are treating of ſerious things.</
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<
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>SAGR. </
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<
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>Excuſe me,
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Salviatus,
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this that I ſay is not ſo
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lutely beſides the buſineſs, as you perhaps make it; for a motion
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that ſerveth inſtead of reſt, and removeth wearineſs from a body
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tired with travail, may much more eaſily ſerve to prevent the
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ming of that wearineſs, like as preventive remedies are more eaſie
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than curative. </
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<
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>And I hold for certain, that if the motion of
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mals ſhould proceed in the ſame manner as this that is aſcribed to
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the Earth, they would never grow weary; Seeing that the
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neſs of the living creature, deriveth it ſelf, in my opinion, from
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the imployment of but one part alone in the moving of its ſelf,
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and all the reſt of the body; as
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v. </
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>g.
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in walking, the thighs and
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the legs onely are imployed for carrying themſelves and all the
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reſt: on the contrary, you ſee the motion of the heart to be as it
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were indefatigable, becauſe it moveth it ſelf alone. </
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<
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>Beſides, I
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know not how true it may be, that the motion of the animal is
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tural, and not rather violent: nay, I believe that one may truly
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ſay, that the ſoul naturally moveth the members of an animal with
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a motion preternatural, for if the motion upwards is
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ral to grave bodies, the lifting up of the legs, and the thighs,
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which are grave bodies, in walking, cannot be done without
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lence, and therefore not without labour to the mover. </
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>The
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climbing upwards by a ladder carrieth the grave body contrary to
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its natural inclination upwards, from whence followeth wearineſs,
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by reaſon of the bodies natural averſneſs to that motion: but in
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moving a moveable with a motion, to which it hath no averſion,
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what laſſitude, what diminution of vertue and ſtrength need we
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fear in the mover? </
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<
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>and how ſhould the forces waſte, where they
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are not at all imployed?</
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Animals would
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not grow weary of
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their motion,
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ceeding as that
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which is aſſigned
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to the terreſtrial
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Globe.
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The cauſe of the
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wearineſſe of
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mals.
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The motion of
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an animal is rather
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to be called violent
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than natural.
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The ſtrength
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miniſheth not,
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where it is not
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ployed.
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<
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>SIMP. </
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<
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>They are the contrary motions wherewith the Earth is
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pretended to move, againſt which the Authour produceth his
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gument.</
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<
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<
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>SAGR. </
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<
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>It hath been ſaid already, that they are no wiſe
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traries, and that herein the Authour is extteamly deceived, ſo
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that the whole ſtrength of the argument recoileth upon the </
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