Galilei, Galileo, The systems of the world, 1661

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SALV. I come again to Ariſtotle, who having very well, and
Methodically
begun his diſcourſe, but having a greater aim to
reſt
at, and hit a marke, predefigned in his minde, then that to
which
his method lead him, digreſſing from the purpoſe, he comes
to
aſſert, as a thing known and manifeſt, that as to the motions
directly
upwards or downwards, they naturally agree to Fire, and
Earth
; and that therefore it is neceſſary, that beſides theſe bodies,
which
are neer unto us, there muſt be in nature another, to which
the
circular motion may agree: which ſhall be ſo much the more
excellent
by how much the circular motion is more perfect, then the
ſtreight
, but how much more perfect that is than this, he
mines
from the greatneſs of the circular lines perfection above the

right
line; calling that perfect, and this imperfect; imperfect,
cauſe
if infinite it wanteth a termination, and end: and if it be
nite
, there is yet ſomething beyond which it may be prolonged.
This is the baſis, ground work, and maſter-ſtone of all the Fabrick
of
the Aristotelian World, upon which they ſuperſtruct all their
other
properties, of neither heavy nor light, of ingenerable
ruptible
, exemption from all motions, ſome onely the local, &c.
And all theſe paſſions he affirmeth to be proper to a ſimple body
that
is moved circularly; and the contrary qualities of gravity,
levity
, corruptibility, &c.
he aſſigns to bodies naturally moveable
in
a ſtreight line, for that if we have already diſcovered defects in
the
foundation, we may rationally queſtion what ſoever may

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