Galilei, Galileo
,
The systems of the world
,
1661
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a caſe can never happen: and though it ſhould, and that the
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parated part ſhould return to its whole, it would not return as
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grave or light, for that the ſame
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Ariſtotle
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proveth, that the
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leſtial Bodies are neither heavie nor light.</
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The right motion
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of grave bodies
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manifeſt to ſenſe.
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Arguments of
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riſtotle,
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to prove
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that grave bodies
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move with an
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clination to arrive
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at the centre of the
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Vniverſe.
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Heavie bodies
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move towards the
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centre of the Earth
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per accidens.</
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To ſeek what
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would follow upon
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an impoſſibility, is
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folly.
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Cœleſtial bodies
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neither heavie nor
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light, according to
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Ariſtotle.</
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<
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>SALV. </
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>With what reaſon I doubt, whether grave bodies move
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by a right and perpendicular line, you ſhall hear, as I ſaid
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fore, when I ſhall examine this particular argument. </
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>Touching
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the ſecond point, I wonder that you ſhould need to diſcover the
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Paralogiſm
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of
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Ariſtotle,
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being of it ſelf ſo manifeſt; and that
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you perceive not, that
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Ariſtotle
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ſuppoſeth that which is in
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on: therefore take notice.</
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<
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>SIMPL. </
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>Pray
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Salviatus
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ſpeak with more reſpect of
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Ariſtotle
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:
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for who can you ever perſwade, that he who was the firſt, only,
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and admirable explainer of the
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Syllogiſtick
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forms of demonſtration,
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of
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Elenchs,
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of the manner of diſcovering
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Sophiſms, Paralogiſms,
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and
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in ſhort, of all the parts of
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Logick,
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ſhould afterwards ſo notoriouſly
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equivocate in impoſing that for known, which is in queſtion? </
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<
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>It
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would be better, my Maſters, firſt perfectly to underſtand him,
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and then to try, if you have a minde, to oppoſe him.</
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Ariſtotle
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cannot
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quivocate, being
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the inventer of
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gick.</
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<
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>SALV.
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Simplicius,
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we are here familiarly diſcourſing among
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our ſelves, to inveſtigate ſome truth; I ſhall not be diſpleaſed
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that you diſcover my errors; and if I do not follow the mind of
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Ariſtotle,
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freely reprehend me, and I ſhall take it in good part.
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<
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>Onely give me leave to expound my doubts, and to reply
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thing to your laſt words, telling you, that
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Logick,
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as it is well
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underſtood, is the Organe with which we philoſophate; but as it
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may be poſſible, that an Artiſt may be excellent in making
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gans, but unlearned in playing on them, thus he might be a great
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Logician, but unexpert in making uſe of
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Logick
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; like as we have
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many that theorically underſtand the whole Art of Poetry, and
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yet are unfortunate in compoſing but meer four Verſes; others
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enjoy all the precepts of
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Vinci
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^{*}, and yet know not how to paint
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a Stoole. </
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>The playing on the Organs is not taught by them who
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know how to make Organs, but by him that knows how to play
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on them: Poetry is learnt by continual reading of Poets:
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ing is learnt by continual painting and deſigning: Demonſtration
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from the reading of Books full of demonſtrations, which are the
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Mathematical onely, and not the Logical. </
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<
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>Now returning to our
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purpoſe, I ſay, that that which
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Ariſtotle
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ſeeth of the motion of
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light bodies, is the departing of the Fire from any part of the
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Superficies of the Terreſtrial Globe, and directly retreating from
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it, mounting upwards; and this indeed is to move towards a
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circumference greater than that of the Earth; yea, the ſame
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riſtotle
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makes it to move to the concave of the Moon, but that
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this circumference is that of the World, or concentrick to it, ſo </
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