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

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1
A Magnetiſme in
the Air, by which
it bears up thoſe
Solids in the
ter, that are
tiguous with it.
The Effect of
the Airs
guity in the
tation of Solids.
The force of
Contact.
An
on of
ion betwixt
lids and the Air
contiguous to
them.
The like
ation of
junction
twixt Solids &
the water.
Alſo the like
affectation and
Conjunction
twixt Solids
themſeives.
Contact may
be the Cauſe of
the Continuity
of Naturall
dies.
Now, purſuing my purpoſe, I ſay; that it needs not, that we have
recourſe to the Tenacity, that the parts of the water have amongſt
ſelves, by which they reſiſt and oppoſe Diviſion, Diſtraction, and Seper­
ration, becauſe there is no ſuch Coherence and Reſiſtance of
for if there were, it would be no leſs in the internall parts than in
nearer the ſuperiour or externall Surface, ſo that the ſame Board,
ing alwayes the ſame Reſiſtance and Renitence, would no leſs ſtop
the middle of the water than about the Surface, which is falſe.
over, what Reſiſtance can we place in the Continuity of the water
if we ſee that it is impoſſible to ſind any Body of whatſoever Matter
Figure or Magnitude, which being put into the water, ſhall be
and impeded by the Tenacity of the parts of the water to one another
ſo, but that it is moved upwards or downwards, according as the Cauſe
of their Motion tranſports it?
And, what greater proof of it can we
ſier, than that which we daily ſee in Muddy waters, which being put into
Veſſels to be drunk, and being, after ſome hours ſetling, ſtill, as we

thick in the end, after four or ſix dayes they are wholly ſetled, and be­
come pure and clear?
Nor can their Reſiſtance of Penetration ſtay thoſe
impalpable and inſenſible Atomes of Sand, which by reaſon of
exceeding ſmall force, ſpend ſix dayes in deſcending the ſpace of
a yard.
The ſettlement
of Muddy
ter, proveth that
that Element
hath no
on to Diviſion.
Nor let them ſay, that the ſeeing of ſuch ſmall Bodies, conſume ſix dayes
deſcending ſo little a way, is a ſufficient Argument of the Waters
of Diviſion; becauſe that is no reſiſting of Diviſion, but a retarding of

Motion; and it would be ſimplicity to ſay, that a thing oppoſeth Diviſion
and that in the ſame inſtant, it permits it ſelf to be divided: nor doth the
Retardation of Motion at all favour the Adverſaries cauſe, for that they
to inſtance in a thing that wholly prohibiteth Motion, and procureth
it is neceſſary, therefore, to find out Bodies that ſtay in the water, if one would
ſhew its repugnancy to Diviſion, and not ſuch as move in it, howbeit
ſlowly.
Water cannot
oppoſe diviſion,
and at the ſame
time permit it
ſelf to be
ded.
What then is this Craſſitude of the water, with which it reſiſteth Di­
viſion?
What, I beſeech you, ſhould it be, if we (as we have ſaid
with all diligence attempting the reduction of a Matter into ſo like a
Gravity with the water, that forming it into a dilated Plate it reſts ſuſ­
pended as we have ſaid, between the two waters, it be impoſſible
effect it, though we bring them to ſuch an Equiponderance, that
much Lead as the fourth part of a Grain of Muſterd-ſeed, added to
ſame expanded Plate, that in Air [i. e. out of the water] ſhall weigh four
or fix pounds, ſinketh it to the Bottom, and being ſubſtracted, it
to the Surface of the water?
I cannot ſee, (if what I ſay be true, as it
moſt certain) what minute vertue and force we can poſſibly find or
gine, to which the Reſiſtance of the water againſt Diviſion and

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