Galilei, Galileo, Discourse concerning the natation of bodies, 1663
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1but a compoſition of Ebony and Air, from which reſulteth a Solid
no longer ſuperiour in Gravity to the water, as was the ſimple Ebony,
or the ſimple Gold.
And, if we exactly conſider, what, and how
great the Solid is, that in this Experiment enters into the water, and
contraſts with the Gravity of the ſame, it will be found to be all that
which we find to be beneath the Surface of the water, the which is
an aggregate and Compound of a Board of Ebony, and of almoſt
the like quantity of Air, or a Maſs compounded of a Plate of Lead,
and ten or twelve times as much Air.
But, Genrlemen, you that
are my Antagoniſts in our Queſtion, we require the Identity of
Matter, and the alteration only of the Figure; therefore, you muſt
remove that Air, which being conjoyned with the Board, makes it
become another Body leſs grave than the Water, and put only the
Ebony into the Water, and you ſhall certainly ſee the Board deſcend
to the Bottom; and, if that do not happen, you have got the day.

And to ſeperate the Air from the Ebony, there needs no more but
only to bath the Superficies of the ſaid Board with the ſame Water:
for the Water being thus interpoſed between the Board and the Air,
the other circumfuſed Water ſhall run together without any
ment, and ſhall receive into it the ſole and bare Ebony, as it was to do.
Why ſolids
having
ted the Water,
do not proceed
to a totail
merſion.
How to
rate the Air from
Solids in
ting them into
the water.
But, me thinks I hear ſome of the Adverſaries cunningly oppoſing
this, and telling me, that they will not yield, by any means, that
their Board be wetted, becauſe the weight added thereto by the
Water, by making it heavier than it was before, draws it to the
Bottom, and that the addition of new weight is contrary to our
greement, which was, that the Matter be the ſame.
To this, I anſwer, firſt; that treating of the operation of Figure
in Bodies put into the Water, none can ſuppoſe them to be put into
the Water without being wet; nor do I deſire more to be done to
the Board, then I will give you leave to do to the Ball.
Moreover,
it is untrue, that the Board ſinks by vertue of the new Weight added
to it by the Water, in the ſingle and ſlight bathing of it: for I will
put ten or twenty drops of Water upon the ſame Board, whilſt it is
ſuſtained upon the water, which drops, becauſe not conjoyned with
the other Water circumfuſed, ſhall not ſo encreaſe the weight of it, as
to make it ſink: but if the Board being taken out, and all the water
wiped off that was added thereto, I ſhould bath all its Superficies
with one only very ſmall drop, and put it again upon the water,
out doubt it ſhall ſink, the other Water running to cover it, not
ing retained by the ſuperiour Air; which Air by the interpoſition of
the thin vail of water, that takes away its Contiguity unto the Ebony,
ſhall without Renitence be ſeperated, nor doth it in the leaſt oppoſe
the ſucceſſion of the other Water: but rather, to ſpeak better, it
ſhall deſcend freely; becauſe it ſhall be all invironed and covered

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