Galilei, Galileo, The systems of the world, 1661

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SAGR. Therefore affirming, that denſity and rarity, which
mongſt
the Elements ſhould be the cauſe of gravity and levity,
which
may be the cauſes of contrary motions ſurſùm and
ſùm
, on which, again, dependeth the contrarieties for generation
and
corruption; it ſufficeth not that they be thoſe denſneſſes and
rareneſſes
which under the ſame quantity, or (if you will) maſs
contain
much or little matter, but it is neceſſary that they be
neſſes
and rareneſſes cauſed by the primary qualities, hot and
cold
, otherwiſe they would operate nothing at all: but if this be
ſo
, Ariſtotle hath deceived us, for that he ſhould have told it us at

firſt
, and ſo have left written that thoſe ſimple bodies are
rable
and corruptible, that are moveable with ſimple motions
upwards
and downwards, dependent on levity and gravity,
ſed
by rarity and denſity, made by much or little matter, by
reaſon
of heat and cold; and not to have ſtaid at the ſimple
tion
ſurſùm and deorſùm: for I aſſure you that to the making
of
bodies heavy or light, whereby they come to be moved with
contrary
motions, any kind of denſity and rarity ſufficeth,
ther
it proceed from heat and cold, or what elſe you pleaſe; for
heat
and cold have nothing to do in this affair: and you ſhall
upon
experiment find, that a red hot iron, which you muſt grant
to
have heat, weigheth as much, and moves in the ſame manner
as
when it is cold.
But to overpaſs this alſo, how know you but
that
Cœleſtial rarity and denſity depend on heat and cold?

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