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

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The Ancients
denved Aoſolute
Levity.
The cauſes of
Natation & Sub­
merſion, accord­
ing to the Peri­
pateticks.
This is all that I have been able to collect, as produced againſt
Archimedes by Signor Buonamico: who hath not well obſerved the
Principles and Suppoſitions of Archimedes; which yet muſt be
falſe, if the Doctrine be falſe, which depends upon them; but is
contented to alledge therein ſome Inconveniences, and ſome Repug­
nances to the Doctrine and Opinion of Ariſtotle. In anſwer to which
Objections, I ſay, firſt, That the being of Archimedes Doctrine, ſim­

ply different from the Doctrine of Ariſtotle, ought not to move any
to ſuſpect it, there being no cauſe, why the Authority of this ſhould
be preferred to the Authority of the other: but, becauſe, where the
decrees of Nature are indifferently expoſed to the intellectuall eyes of
each, the Authority of the one and the other, loſeth all anthentical­
neſs of Perſwaſion, the abſolute power reſiding in Reaſon; therefore
I paſs to that which he alledgeth in the ſecond place, as an abſurd con­

ſequent of the Doctrine of Archimedes, namely, That water ſhould
be more grave than Earth.
But I really find not, that ever Archi­
medes ſaid ſuch a thing, or that it can be rationally deduced from his
Concluſions: and if that were manifeſt unto me, I verily believe, I
ſhould renounce his Doctrine, as moſt erroneous.
Perhapsthis Dedu­
ction of Buonamico, is founded upon that which he citeth of the Ve­
ſſel, which ſwims as long as its voyd of water, but once full it ſinks to
the Bottom, and underſtanding it of a Veſſel of Earth, he infers againſt
Archimedes thus: Thou ſayſt that the Solids which ſwim, are leſs grave
than water: this Veſſell ſwimmeth: therefore, this Veſſell is leſſe grave
than water.
If this be the Illation. I eaſily anſwer, granting that this
Veſſell is leſſe grave than water, and denying the other conſequence,

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