Galilei, Galileo, Discourse concerning the natation of bodies, 1663

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Laſtly, Aristotle having ſaid, that if the Poſition of Democritus
were
true, it would follow, that a great Maſs of Air ſhould move
more
ſwiftly than a ſmall Maſs of water, and afterwards ſubjoyned,
that
that is never ſeen in any Caſe: methinks others may become
ſirous
to know of him in what place this ſhould evene, which he
duceth
againſt Democritus, and what Experiment teacheth us, that
it
never falls out ſo.
To ſuppoſe to ſee it in the Element of water,
or
in that of the Air is vain, becauſe neither doth water through
water
, nor Air through Air move, nor would they ever by any
whatever
participation others aſſign them, of Earth or of Fire: the
Earth
, in that it is not a Body fluid, and yielding to the mobility of
other
Bodies, is a moſt improper place and Medium for ſuch an
periment
: Vacuum, according to the ſame Ariſtotle himſelf, there
is
none, and were there, nothing would move in it: there remaine
the
Region of Fire, but being ſo far diſtant from us, what
ment
can aſſure us, or hath aſſertained Ariſtotle in ſuch ſort, that he
ſhould
as of a thing moſt obvious to ſence, affirm what he
ceth
in confutation of Democritus, to wit, that a great Maſs of Air,
is
moved no ſwifter than a little one of water?
But I will dwell no
longer
upon this matter, whereon I have ſpoke ſufficiently: but
leaving
Democritus, I return to the Text of Ariſtotle, wherein he
goes
about to render the true reaſon, how it comes to paſs, that the
thin
Plates of Iron or Lead do ſwim on the water; and, moreover,
that
Gold it ſelf being beaten into thin Leaves, not only ſwims in
water
, but flyeth too and again in the Air.
He ſuppoſeth that of

Continualls
, ſome are eaſily diviſible, others not: and that of the
eaſily
diviſible, ſome are more ſo, and ſome leſs: and theſe he
affirms
we ſhould eſteem the Cauſes.
He addes that that is eaſily
diviſible
, which is well terminated, and the more the more diviſible,
and
that the Air is more ſo, than the water, and the water than the
Earth
.
And, laſtly, he ſuppoſeth that in each kind, the leſſe
tity
is eaſlyer divided and broken than the greater.

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