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

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1but that the Winde oppoſite to the South may do the ſame, but only
affirmeth
that the force of the Water prevailing over the
Wind
, the Bark ſhall move towards the South: and ſaith no more
than
is true.
And juſt thus when Archimedes ſaith, that the Gravity
of
the Water prevailing over that by which the moveable deſcends to
the
Bottom, ſuch moveable ſhall be raiſed from the Bottom to the
face
alledgeth a very true Cauſe of ſuch an Accident, nor doth he
firm
or deny that there is, or is not, a vertue contrary to Gravity, called
by
ſome Levity, that hath alſo a power of moving ſome Matters up
wards
.
Let therefore the Weapons of Signor Buonamico be directed

gainſt
Plato, and other Ancients, who totally denying Levity, and taking
all
Bodies to be grave, ſay that the Motion upwards is made, not
from
an intrinſecal Principle of the Moveable, but only by the
pulſe
of the Medium; and let Archimedes and his Doctrine eſcape
him
, ſince he hath given him no Cauſe of quarelling with him
But
if this Apologie, produced in defence of Archimedes, ſhould ſeen
to
ſome inſufficient to free him from the Objections and Arguments
produced
by Ariſtotle againſt Plato, and the other Ancients, as if they
did
alſo fight againſt Archimedes, alledging the Impulſe of the Water

as
the Cauſe of the ſwimming of ſome Bodies leſs grave than it, I would
not
queſtion, but that I ſhould be able to maintaine the Doctrine of
Plato and thoſe others to be moſt true, who abſolutely deny Levity,
and
affirm no other Intrinſecal Principle of Motion to be in
tary
Bodies ſave only that towards the Centre of the Earth, nor no

other
Cauſe of moving upwards, ſpeaking of that which hath the
ſemblance
of natural Motion, but only the repulſe of the Medium, ſluid,
and
exceeding the Gravity of the Moveable: and as to the Reaſons
of
Ariſtotle on the contrary, I believe that I could be able fully to

anſwer
them, and I would aſſay to do it, if it were abſolutely
ry
to the preſent Matter, or were it not too long a Digreſſion for this
ſhort
Treatiſe.
I will only ſay, that if there were in ſome of our
mentary
Bodies an Intrinſecall Principle and Naturall Inclination
to
ſhun the Centre of the Earth, and to move towards the Concave
of
the Moon, ſuch Bodies, without doubt, would more ſwiftly aſcend
through
thoſe Mediums that leaſt oppoſe the Velocity of the Moveable,
and
theſe are the more tenuous and ſubtle; as is, for example, the
Air
in compariſon of the Water, we daily proving that we can with

farre
more expeditious Velocity move a Hand or a Board to and
gain
in one than in the other: nevertheleſs, we never could finde any
Body
, that did not aſcend much more ſwiftly in the water than in the

Air
.
Yea of Bodies which we ſee continually to aſcend in the Water,
there
is none that having arrived to the confines of the Air, do not
ly
loſe their Motion; even the Air it ſelf, which riſing with great
lerity
through the Water, being once come to its Region it loſeth all

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