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

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1impreſs the Figures for cutting or penetrating this or that Body,
as
the ſolidity or obdurateneſs of the ſaid Bodies ſhall be greater
or
leſs, is very neceſſary: but withall I ſubjoyn, that ſuch
ion
, election and caution would be ſuperfluous and unprofitable, if
the
Body to be cut or penetrated, ſhould have no Reſiſtance, or
ſhould
not at all withſtand the Cutting or Penitration: and if the
Knife
were to be uſed in cutting a Miſt or Smoak, one of Paper
would
be equally ſerviceable with one of Damaſcus Steel: and ſo
by
reaſon the water hath not any Reſiſtance againſt the Penitration
of
any Solid Body, all choice of Matter is ſuperfluous and needleſs,
and
the Election which I ſaid above to have been well made of a
Matter
reciprocall in Gravity to water, was not becauſe it was
ceſſary
, for the overcoming of the craſſiitude of the water, but its
Gravity
, with which only it reſiſts the ſinking of Solid Bodies: and
for
what concerneth the Reſiſtance of the craſſitude, if we narrowly
conſider
it, we ſhall find that all Solid Bodies, as well thoſe that
ſink
, as thoſe that ſwim, are indifferently accomodated and apt to
bring
us to the knowledge of the truth in queſtion.
Nor will I
be
frighted out of the belief of theſe Concluſions, by the
ments
which may be produced againſt me, of many ſeverall Woods,
Corks
, Galls, and, moreover, of ſubtle ſlates and plates of all ſorts
of
Stone and Mettall, apt by means of their Naturall Gravity, to
move
towards the Centre of the Earth, the which, nevertheleſs,
ing
impotent, either through the Figure (as the Adverſaries thinke)
or
through Levity, to break and penetrate the Continuity of the
parts
of the water, and to diſtract its union, do continue to ſwimm
without
ſubmerging in the leaſt: nor on the other ſide, ſhall the
Authority
of Ariſtotle move me, who in more than one place,
meth
the contrary to this, which Experience ſhews me.

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