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

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1The ſecond, that Nulla res ſeipſam producat; [i. e.] that nothing
produceth it ſelf: from whence it follows, that it is not
ble that the mover and moved ſhould be totally the ſame thing:
And this is manifeſt, not onely in things that are moved by an
trinſick mover; but it is gathered alſo from the principles
pounded, that the ſame holdeth true in the natural motion
dent on an intrinſick principle; otherwiſe, being that the mover,
as a mover, is the cauſe, and the thing moved, as moved, is the
effect, the ſame thing would totally be both the cauſe and effect.
Therefore a body doth not move its whole ſelf, that is, ſo as
that all moveth, and all is moved; but its neceſſary in the thing
moved to diſtinguiſh in ſome manner the efficient principle of the
motion, and that which with that motion is moved.
The third
Axiom is, that in rebus quæ ſenſui ſubjiciuntur, unum, quatenus
unum, unam ſolam rem producat; i.
e. That in things ſubject to
the ſenſes, one, as it is one, produceth but onely one thing: That
is, the ſoul in animals produceth its true divers operations, as the
ſight, the hearing, the ſmell, generation, &c. but all theſe with
ſeveral inſtruments.
And in ſhort, in things ſenſible, the
ty of operations, is obſerved to derive it ſelf from the diverſity
that is in the cauſe.
Now if we put all theſe Axioms together, it

will be a thing very manifeſt, that one ſimple body, as is the
Earth, cannot of its own nature move at the ſame time with
three motions, very divers: For by the foregoing ſuppoſitions,
all moveth not its ſelf all; it is neceſfary therefore to diſtinguiſh
in it three principles of its three motions; otherwiſe one and the
ſame principle would produce many motions; but if it contein in
it three principles of natural motions, beſides the part moved, it
ſhall not be a ſimple body, but compounded of three principle
movers, and of the part moved.
If therefore the Earth be a

ple body, it ſhall not move with three motions; nay more, it will
not move with any of thoſe which Copernicus aſcribeth to it, it
being to move but with one alone, for that it is manifeſt, by the
reaſons of Ariſtotle, that it moveth to its centre, as its parts do
ſhew, which deſcend at right angles to the Earths Spherical
Surface.
Arguments
gainſt the Earths
motion taken, ex
rerum natura.
Three Axioms
that are ſuppoſed
manifeſt.
A ſimple body
as the Earth,
not move with
three ſeveral
ons.
The Earth
not move with any
of the motions
gned it by
cus.
SALV. Many things might be ſaid, and conſidered touching
the connection of this argument; but in regard that we can

ſolve it in few words, I will not at this time without need inlarge
upon it; and ſo much the rather, becauſe the ſame Author hath
furniſhed me with an anſwer, when he ſaith that from one ſole
ple in animals, there are produced divers operations; ſo that for
the preſent my anſwer ſhall be, that in the ſame manner the Earth
from one onely principle deriveth ſeveral operations.
Anſwers to the
arguments
ry to the Earths
motion, taken ex
rerum natura.
SIMP. But this anſwer will not at all ſatisfie the Author who

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