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

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1
The diverſity of
motions helpeth us
in knowing the
verſity of natures.
SAGR. I have twice or thrice obſerved in the diſcourſes of this
Authour, that to prove that a thing is ſo, or ſo, he ſtill alledgeth,
that in that manner it is conformable with our underſtanding; or
that otherwiſe we ſhould never be able to conceive of it; or that
the Criterium of Philoſophy would be overthrown. As if that

ture had firſt made mens brains, and then diſpoſed all things in
conformity to the capacity of their intellects.
But I incline rather
to think that Nature firſt made the things themſelves, as ſhe beſt
liked, and afterwards framed the reaſon of men capable of
ceiving (though not without great pains) ſome part of her
crets.
Nature firſt
made things as ſhe
pleaſed, and
wards capacitated
mens
ings for conceiving
of them.
SALV. I am of the ſame opinion. But tell me, Simplicius,
which are theſe different natures, to which, contrary to
rience and reaſon, Copernicus aſſignes the ſame motions and
rations.
SIMP. They are theſe. The Water, the Air, (which
leſſe are Natures different from the Earth) and all things that
are in thoſe elements compriſed, ſhall each of them have thoſe
three motions, which Copernicus pretends to be in the Terreſtriall
Globe; and my Authour proceedeth to demonſtrate

cally, that, according to the Copernican Doctrine, a cloud that is
ſuſpended in the Air, and that hangeth a long time over our
heads without changing place, muſt of neceſſity have all thoſe three
motions that belong to the Terreſtrial Globe.
The
tion is this, which you may read your ſelf, for I cannot repeat it
without book.
Copernicus
roneouſly aſſigneth
the ſame operations
to different natures
SALV. I ſhall not ſtand reading of it, nay I think it an
tinency in him to have inſerted it, for I am certain, that no
Copernican will deny the ſame. Therefore admitting him what he
would demonſtrate, let us ſpeak to the objection, which in my
judgment hath no great ſtrength to conclude any thing contrary
to the Copernican Hypotheſis, ſeeing that it derogates nothing from
thoſe motions, and thoſe operations, whereby we come to the
knowledge of the natures, &c.
Anſwer me, I pray you,
us: Thoſe accidents wherein ſome things exactly concur, can
they ſerve to inform us of the different natures of thoſe
From commune
accidents one
not know different
natures.
SIMP. No Sir: nay rather the contrary, for from the idendity
of operations and of accidents nothing can be inferred, but an
idendity of natures.
SALV. So that the different natures of the Water, Earth, Air,
and other things conteined in theſe Elements, is not by you
ed from thoſe operations, wherein all theſe Elements and their
fixes agree, but from other operations; is it ſo?
SIMP. The very ſame.
SALV. So that he who ſhould leave in the Elements all thoſe

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