Galilei, Galileo, The systems of the world, 1661
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              <s>
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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.</s>
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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.</s>
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              <s>
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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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              </s>
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              <s>
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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.</s>
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              <s>SALV. </s>
              <s>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. </s>
              <s>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.</s>
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              <s>SIMPL. </s>
              <s>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? </s>
              <s>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.</s>
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            <p type="margin">
              <s>
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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.</s>
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              <s>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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              </s>
              <s>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. </s>
              <s>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. </s>
              <s>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 </s>
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