Galilei, Galileo, The systems of the world, 1661

Table of figures

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              <s>SIMP. </s>
              <s>In my opinion, it cannot be denied, but that your
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              courſe carrieth with it much of probability, arguing, as we ſay,
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              ex ſuppoſitione,
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              namely, granting that the Earth moveth with
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              the two motions aſſigned it by
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              Copernicus
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              : but if that motion
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              be diſproved, all that you have ſaid is vain, and inſignificant:
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              and for the diſproval of that
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              Hypotheſis,
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              it is very manifeſtly
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              hinted by your Diſcourſe it ſelf. </s>
              <s>You, with the ſuppoſition of
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              the two Terreſtrial motions, give a reaſon of the ebbing and
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              flowing; and then again, arguing circularly, from the ebbing
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              and flowing, draw the reaſon and confirmation of thoſe very
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              motions; aud ſo proceeding to a more ſpecious Diſcourſe, you
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              ſay that the Water, as being a fluid body, and not tenaciouſly
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              annexed to the Earth, is not conſtrained punctually to obey
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              ry of its motions, from which you afterwards infer its ebbing
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              and flowing, Now I, according to your own method, argue
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              the quite contrary, and ſay; the Air is much more tenuous, and
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              fluid than the Water, and leſſe annexed to the Earths
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              es, to which the Water, if it be for nothing elſe, yet by reaſon
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              of its gravity that preſſeth down upon the ſame more than the
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              light Air, adhereth; therefore the Air is much obliged to
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              low the motions of the Earth: and therefore were it ſo, that the
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              Earth did move in that manner, we the inhabitants of it, and
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              carried round with like velocity by it, ought perpetually to feel
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              a Winde from the Eaſt that beateth upon us with intolerable
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              force. </s>
              <s>And that ſo it ought to fall out, quotidian experience
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              ſureth us: for if with onely riding poſt, at the ſpeed of eight or
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              ten miles an hour in the tranquil Air, the incountering of it with
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              our face ſeemeth to us a Winde that doth not lightly blow upon
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              us, what ſhould we expect from our rapid courſe of 800. or a
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              thouſand miles an hour, againſt the Air, that is, free from that
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              motion? </s>
              <s>And yet, notwithſtanding we cannot perceive any
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              thing of that nature.</s>
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              <s>
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              The Hypotheſir
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              of the Earths
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              bility taken in
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              vour of the Tide,
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              oppoſed.
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              <s>SALV. </s>
              <s>To this objection that hath much of likelihood in it, I
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              reply, that its true, the Air is of greater tenuity and levity; and,
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              by reaſon of its levity, leſſe adherent to the Earth than Water ſo
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              much more grave and ^{*}bulky; but yet the conſequence is falſe
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              that you infer from theſe qualities; namely, that upon account
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              of that its levity, tenuity, and leſſe adherence to the Earth, it
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              ſhould be more exempt than the Water from following the
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              Terreſtrial Motions; ſo as that to us, who abſolutely pertake of
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              of them, the ſaid exemption ſhould be ſenſible and manifeſt;
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              nay, it happeneth quite contrary; for, if you well remember, the
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              cauſe of the ebbing and flowing of the Water aſſigned by us,
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              conſiſteth in the Waters not following the unevenneſſe of the
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              motion of its Veſſel, but retaining the
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              impetus
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              conceived before, </s>
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