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

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1
SAGR. But this would be to draw a further inconvenience
on himſelf, in that he holdeth, that the bare eye cannot be
ved in judging of the right motion of deſcending graves, and yet
holds that it is deceived in beholding theſe other motions at ſuch
time as its viſive vertue is perfected, and augmented to thirty times
as much as it was before.
We tell him therefore, that the Earth in
like manner partaketh of the plurality of motions: and it is
haps the ſame, whereby the Loadſtone hath its motion
wards, as grave, and two circular motions, one Horizontal, and the
other Vertical under the Meridian.
But what more; tell me,
plicius, between which do you think this Author would put a
greater difference, 'twixt right and circular motion, or 'twixt
on and reſt?
SIMP. 'Twixt motion and reſt, certainly. And this is

feſt, for that circular motion is not contrary to the right, according
to Aristotle; nay, he granteth that they may mix with each
ther; which it is impoſſible for motion and reſt to do.
Motion and reſt
are more different
than right motion
and circular.
SAGR. Therefore its a propoſition leſſe improbable to place
in one natural body two internal principles, one to right motion,
and the other to circular, than two ſuch interne principles one to
motion, and the other to reſt.
Now both theſe poſitions agree to

the natural inclination that reſideth in the parts of the Earth to
turn to their whole, when by violence they are divided from it;
and they onely diſſent in the operation of the whole: for the
ter of them will have it by an interne principle to ſtand ſtill, and
the former aſcribeth to it the circular motion.
But by your
ceſſion, and the confeſſion of this Philoſopher, two principles, one
to motion, and the other to reſt, are incompatible together, like as
their effects are incompatible: but now this evenes not in the two
motions, right, and circular, which have no repugnance to each
other.
One may more
rationally aſcribe
to the Earth two
internal principles
to the right, and
circular motion,
than two to motion
and reſt.
SALV. Adde this more, that in all probability it may be that

the motion, that the part of the Earth ſeparated doth make whilſt
it returneth towards its whole, is alſo circular, as hath been
dy declared; ſo that in all reſpects, as far as concernes the preſent
caſe, Mobility ſeemeth more likely than Reſt.
Now proceed,
Simplicius, to what remains.
The motion of
the parts of the
Earth returning to
their whole may be
circular.
SIMP. The Authour backs his Argument with producing
ther abſurdity, that is, that the ſame motions agree to Natures
treamly different; but experience ſheweth, that the operations

and motions of different natures, are different; and Reaſon
firmeth the ſame: for otherwiſe we ſhould have no way left to
know and diſtinguiſh of natures, if they ſhould not have their
particular motions and operations, that might guide us to the
knowledge of their ſubſtances.

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