Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1tures themſelves, which yet move naturally, and from an intern
principle, do grow weary, and have need of reſt to relax and
freſh their members --------
An explanation
of the true ſenſe of
Kepler and his
fence.
The greatneſſe
and ſmalneſſe of
the body make a
difference in
on and not in reſt.
The order of
ture is to make the
leſſer Orbs to
culate in ſhorter
times, and the
ger in longer times.
SAGR. Methinks I hear Kepler anſwer him to that, that
there are ſome kinde of animals which refreſh themſelves after
wearineſſe, by rowling on the Earth; and that therefore there

is no need to fear that the Terreſtrial Globe ſhould tire, nay it
may be reaſonably affirmed, that it enjoyeth a perpetual & moſt
tranquil repoſe, keeping it ſelf in an eternal rowling.
The feigned
ſwer of Kepler
vered with an
tificial Irony.
SALV. You are too tart and Satyrical, Sagredus: but let us
lay aſide jeſts, whilſt we are treating of ſerious things.
SAGR. Excuſe me, Salviatus, this that I ſay is not ſo
lutely beſides the buſineſs, as you perhaps make it; for a motion
that ſerveth inſtead of reſt, and removeth wearineſs from a body
tired with travail, may much more eaſily ſerve to prevent the

ming of that wearineſs, like as preventive remedies are more eaſie
than curative.
And I hold for certain, that if the motion of
mals ſhould proceed in the ſame manner as this that is aſcribed to
the Earth, they would never grow weary; Seeing that the
neſs of the living creature, deriveth it ſelf, in my opinion, from

the imployment of but one part alone in the moving of its ſelf,
and all the reſt of the body; as v. g. in walking, the thighs and
the legs onely are imployed for carrying themſelves and all the
reſt: on the contrary, you ſee the motion of the heart to be as it
were indefatigable, becauſe it moveth it ſelf alone.
Beſides, I

know not how true it may be, that the motion of the animal is
tural, and not rather violent: nay, I believe that one may truly
ſay, that the ſoul naturally moveth the members of an animal with
a motion preternatural, for if the motion upwards is
ral to grave bodies, the lifting up of the legs, and the thighs,
which are grave bodies, in walking, cannot be done without
lence, and therefore not without labour to the mover.
The
climbing upwards by a ladder carrieth the grave body contrary to
its natural inclination upwards, from whence followeth wearineſs,
by reaſon of the bodies natural averſneſs to that motion: but in
moving a moveable with a motion, to which it hath no averſion,

what laſſitude, what diminution of vertue and ſtrength need we
fear in the mover?
and how ſhould the forces waſte, where they
are not at all imployed?
Animals would
not grow weary of
their motion,
ceeding as that
which is aſſigned
to the terreſtrial
Globe.
The cauſe of the
wearineſſe of
mals.
The motion of
an animal is rather
to be called violent
than natural.
The ſtrength
miniſheth not,
where it is not
ployed.
SIMP. They are the contrary motions wherewith the Earth is
pretended to move, againſt which the Authour produceth his
gument.
SAGR. It hath been ſaid already, that they are no wiſe
traries, and that herein the Authour is extteamly deceived, ſo
that the whole ſtrength of the argument recoileth upon the

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