Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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            <p type="main">
              <s>
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              Earth, like as it carrieth the clouds along with it, ſo it tranſporteth
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              birds and every thing elſe which is pendent in the ſame; in ſo much
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              that as to the buſineſſe of keeping pace with the Earth, the birds
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              need take no care thereof, but for that work might ſleep
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              tually.</s>
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              <s>SAGR. </s>
              <s>That the Air can carry the clouds along with it, as
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              being matters eaſie for their lightneſſe to be moved and deprived
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              of all other contrary inclination, yea more, as being matters that
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              partake alſo of the conditions and properties of the Earth; I
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              prehend without any difficulty; but that birds, which as having
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              life, may move with a motion quite contrary to the diurnal, once
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              having ſurceaſed the ſaid motion, the Air ſhould reſtore them to
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              it, ſeems to me a little ſtrange, and the rather for that they are ſolid
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              and weighty bodies; and withal, we ſee; as hath been ſaid, ſtones
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              and other grave bodies to lie unmoved againſt the
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              impetus
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              of the
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              air; and when they ſuffer themſelves to be overcome thereby,
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              they never acquire ſo much velocity as the wind which carrieth
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              them.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>We aſcribe not ſo little force,
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              Sagredus,
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              to the moved
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              Air, which is able to move and bear before it ſhips full fraught,
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              to tear up trees by the roots, and overthrow Towers when it
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              moveth ſwiftly; and yet we cannot ſay that the motion of the
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              Air in theſe violent operations is neer ſo violent, as that of the
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              diurnal revolution.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>You ſee then that the moved Air may alſo cotinue the
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              motion of projects, according to the Doctrine of
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              Ariſtotle
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              ; and
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              it ſeemed to me very ſtrange that he ſhould have erred in this
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              particular.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>It may without doubt, in caſe it could continue it ſelf,
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              but lik as when the wind ceaſing neither ſhips go on, nor trees are
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              blown down, ſo the motion in the Air not continuing after the
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              ſtone is gone out of the hand, and the Air ceaſing to move, it
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              followeth that it muſt be ſomething elſe beſides the Air that
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              keth the projects to move.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>But how upon the winds being laid, doth the ſhip ceaſe
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              to move? </s>
              <s>Nay you may ſee that when the wind is down, and
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              the ſails furl'd, the veſſel continueth to run whole miles.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>But this maketh againſt your ſelf
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              Simplicius,
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              for that
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              the wind being laid that filling the ſails drove on the ſhip, yet
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              vertheleſſe doth it without help of the
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              medium
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              continue its
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              courſe.</s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>It might be ſaid that the water was the
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              medium
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              which
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              carried forward the ſhip, and maintain'd it in motion.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>It might indeed be ſo affirmed, if you would ſpeak
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              quite contrary to truth; for the truth is, that the water, by </s>
            </p>
          </chap>
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