Galilei, Galileo, The systems of the world, 1661

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Arguments of
riſtotle, to prove
that grave bodies
move with an in­
clination to arrive
at the centre of the
Vniverſe.
Cœleſtial bodies
neither heavie nor
light, according to
Ariſtotle.
Ariſtotle cannot
quivocate, being
the inventer of Lo­
gick.
SALV. Simplicius, we are here familiarly diſcourſing among
our ſelves, to inveſtigate ſome truth; I ſhall not be diſpleaſed
that you diſcover my errors; and if I do not follow the mind of
Ariſtotle, freely reprehend me, and I ſhall take it in good part.
Onely give me leave to expound my doubts, and to reply ſome­
thing to your laſt words, telling you, that Logick, as it is well
underſtood, is the Organe with which we philoſophate; but as it
may be poſſible, that an Artiſt may be excellent in making Or­
gans, but unlearned in playing on them, thus he might be a great
Logician, but unexpert in making uſe of Logick; like as we have
many that theorically underſtand the whole Art of Poetry, and
yet are unfortunate in compoſing but meer four Verſes; others

enjoy all the precepts of Vinci^{*}, and yet know not how to paint
a Stoole.
The playing on the Organs is not taught by them who
know how to make Organs, but by him that knows how to play
on them: Poetry is learnt by continual reading of Poets: Limn­
ing is learnt by continual painting and deſigning: Demonſtration
from the reading of Books full of demonſtrations, which are the
Mathematical onely, and not the Logical.
Now returning to our
purpoſe, I ſay, that that which Ariſtotle ſeeth of the motion of
light bodies, is the departing of the Fire from any part of the
Superficies of the Terreſtrial Globe, and directly retreating from
it, mounting upwards; and this indeed is to move towards a
circumference greater than that of the Earth; yea, the ſame
riſtotle makes it to move to the concave of the Moon, but that
this circumference is that of the World, or concentrick to it, ſo

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