Galilei, Galileo - Discourse concerning the natation of bodies

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

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greate heate, or exalting of the voyce, either are not underſtood,
or elſe being tranſported by oſtentation of not yeilding to one ano
ther, farr from the firſt Propoſition, with the novelty, of the
various Propoſals, confound both themſelves and their Auditors.

Moreover, it ſeemed to me convenient to informe your High
neſſe of all the ſequell, concerning the Controverſie of which I
treat, as it hath been advertiſed often already by others: and becauſe
the Doctrine which I follow, in the diſcuſſion of the point in hand,
is different from that of Ariſtotle; and interferes with his Principles,
I have conſidered that againſt the Authority of that moſt famous
Man, which amongſt many makes all ſuſpected that comes not from
the Schooles of the Peripateticks, its farr better to give ones Reaſons
by the Pen than by word of mouth and therfore I reſolved to write the
preſent diſcourſe: in which yet I hope to demonſtrate that it was not
out of capritiouſneſſe, or for that I had not read or underſtood
Ariſtotle, that I ſometimes ſwerve from his opinion, but becauſe
ſeverall Reaſons perſwade me to it, and the ſame Ariſtotle hath

tought me to fix my judgment on that which is grounded upon
Reaſon, and not on the bare Authority of the Maſter; and it is
moſt certaine according to the ſentence of Alcinoos, that philoſopha

ting ſhould be free. Nor is the reſolution of our Queſtion in my
judgment without ſome benefit to the Univerſall, foraſmuch as
treating whether the figure of Solids operates, or not, in their going,
or not going to the bottome in Water, in occurrences of building
Bridges or other Fabricks on the Water, which happen commonly
in affairs of grand import, it may be of great availe to know the
truth.

Ariſtotle prefers
Reaſon to the
Authority ofan
Author.

The benefit of
this Argument.

I ſay therfore, that being the laſt Summer in company with certain

Learned men, it was ſaid in the argumentation; That Condenſation
was the propriety of Cold, and there was alledged for inſtance, the
example of Ice: now I at that time ſaid, that, in my judgment,
the Ice ſhould be rather Water rarified than condenſed, and my

reaſon was, becauſe Condenſation begets diminution of Maſs, and
augmentation of gravity, and Rarifaction cauſeth greater Lightneſs,
and augmentarion of Maſſe: and Water in freezing, encreaſeth in
Maſſe, and the Ice made thereby is lighter than the Water on which
it ſwimmeth.

Condenſation
the Propriety of
Cold, according
to the Peripate
ticks.

Ice rather water
rarified, than
condenſed, and
why:

What I ſay, is manifeſt, becauſe, the medium ſubtracting from the
whole Gravity of Sollids the weight of ſuch another Maſſe of the ſaid

Medium; was Archimedes proves in his ^{*} Firſt Booke De Inſidentibus
Humido; when ever the Maſſe of the ſaid Solid encreaſeth by Diſtraction,
the more ſhall the Medium detract from its entire Gravity; and leſſe,
when by Compreſſion it ſhall be condenſed and reduced to a leſſe Maſſe.

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