Galilei, Galileo, The systems of the world, 1661

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              <s>SALV. </s>
              <s>Rather how improper, for being by its tranſparence,
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              wholly inviſible, a man would not be able without ſtumbling at
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              the threſholds, and breaking his head againſt the Walls, to paſs
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              from room to room.</s>
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            <p type="main">
              <s>SAGR. </s>
              <s>This danger would not befall him, if it be true, as ſome
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                <arrow.to.target n="marg160"/>
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                <emph type="italics"/>
              Peripateticks
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              ſay, that it is intangible: and if one cannot
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              touch it, much leſs can it hurt him.</s>
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            <p type="margin">
              <s>
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              The ſubstance of
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              Heaven
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              ble.
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              </s>
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              <s>SALV. </s>
              <s>This would not ſerve the turn, for though the matter
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              of the Heavens cannot be toucht, as wanting tangible qualities:
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              yet may it eaſily touch the elementary bodies; and to offend us
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              it is as ſufficient that it ſtrike us, nay worſe, than if we ſhould
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              ſtrike it. </s>
              <s>But let us leave theſe
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              Pallaces,
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              or, to ſay better, theſe
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                <emph type="italics"/>
              Caſtles
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              in the air, and not interrupt
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              Simplicius.
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              </s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>The queſtion which you have ſo caſually ſtarted, is one
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              of the moſt difficulty that is diſputed in Philoſophy; and I have
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              on that ſubject moſt excellent conceits of a very learned Doctor
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              of
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              Padoua,
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              but it is not now time to enter upon them. </s>
              <s>Therefore
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              returning to our purpoſe, I ſay that the Moon, in my opinion, is
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              much more ſolid than the Earth, but do not infer the ſame, as you
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              do, from the craggineſs and montuoſity of its ſuperficies; but
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                <arrow.to.target n="marg161"/>
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              rather from the contrary, namely, from its aptitude to receive (as
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              we ſee it experimented in the hardeſt ſtones) a poliſh and luſtre
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              exceeding that of the ſmootheſt glaſs, for ſuch neceſſarily muſt
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              its ſuperficies be, to render it apt to make ſo lively reflection of
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              the Suns rays. </s>
              <s>And for thoſe appearances which you mention,
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              of Mountains, Cliffs, Hills, Valleys,
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              &c.
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              they are all illuſions:
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              and I have been preſent at certain publick diſputes, where I have
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              heard it ſtrongly maintained againſt theſe introducers of novelties,
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              that ſuch appearances proceed from nothing elſe, but from the
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              equal diſtribution of the opacous and perſpicuous parts, of which
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              the Moon is inwardly and outwardly compoſed: as we ſee it
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              often fall out in chryſtal, amber, and many other precious ſtones
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              of perfect luſtre; in which by reaſon of the opacity of ſome parts,
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              and the tranſparency of others, there doth appear ſeveral
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              vities and prominencies. </s>
              <s>In the fourth reſemblance, I grant, that
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              the ſuperficies of Terreſtrial Globe beheld from afar, would make
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              two different appearances, namely, one more clear, the other more
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              dark; but I believe that ſuch diverſity would ſucceed quite
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              trary to what you ſay; that is, I hold that the ſurface of the
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              ter would appear lucid, becauſe that it is ſmooth and tranſparent;
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              and that of the Earth would appear obſcure, by reaſon of its
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              pacity and ſcabroſity, ill accommodated for reflecting the light of
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              the Sun. </s>
              <s>Concernïng the fifth compariſon, I grant it wholly, and
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              am able, in caſe the Earth did ſhine as the Moon, to ſhow the
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              ſame to any one that ſhould from thence above behold it, </s>
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          </chap>
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