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

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            <p type="main">
              <s>
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              leſſe forcible and offenſive to the ſight, than that primary and
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              direct light of the Sun. </s>
              <s>And thus without trouble do we behold
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              the face of the Moon; which were it as a Glaſſe, it appearing to
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              us by reaſon of its vicinity, as big as the Sun it ſelf, its ſplendor
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              would be abſolutely intollerable, and would ſeem as if we beheld
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              another Sun.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>Aſcribe not, I beſeech you
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              Sagredus,
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              more to my
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              monſtration, than it produceth. </s>
              <s>I will oppoſe you with an inſtance,
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              which I ſee not well how you can eaſily reſolve. </s>
              <s>You inſiſt upon it
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              as a grand difference between the Moon and Glaſſe, that it emits
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              its reflection towards all parts equally, as doth the Wall;
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              as the Glaſſe caſts it upon one onely determinate place; and from
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              hence you conclude the Moon to be like to the Wall, and not to
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              the Glaſſe: But I muſt tell you, that that ſame Glaſſe caſts its
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                <arrow.to.target n="marg165"/>
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              reflection on one place onely, becauſe its ſurface is flat, and the
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              reflex rayes being to depart at angles equal to thoſe of the rayes
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              of incidence, it muſt follow that from a plane or flat ſuperficies,
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              they do depart unitedly towards the ſame place; but in regard
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              that the ſuperficies of the Moon is not plain, but ſpherical, and
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              the incident rayes upon ſuch a ſuperficies, being to reflect
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              ſelves at angles equal to thoſe of the incidence towards all parts,
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              by means of the infinity of the inclinations which compoſe the
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              ſpherical ſuperficies, therefore the Moon may ſend forth its
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              on every way; and there is no neceſſity for its repercuſſion upon one
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              place onely, as that Glaſſe which is flat.</s>
            </p>
            <p type="margin">
              <s>
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                <emph type="italics"/>
              Flat
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              glaſſes caſt forth
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              the reflection
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              wards but one
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              place, but the
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              ſpherical every
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              way.
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              </s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>This is one of the very ſame objections, which I
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              tended to have made againſt him.</s>
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              <s>SAGR. </s>
              <s>If this be one, you had need have more of them; yet
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              I tell you, that as to this firſt, it ſeems to me to make more
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              gainſt you, than for you.</s>
            </p>
            <p type="main">
              <s>SIMPL. </s>
              <s>You have pronounced as a thing manifeſt, that the
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              ction made by that Wall, is as cleer and lucid as that which the
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              Moon ſends forth, and I eſteem it nothing in compariſon thereto.
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              </s>
              <s>“For, in this buſineſſe of the illumination, its requiſite to reſpect,
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              and to diſtinguiſh the
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              Sphere
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              of
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              Activity
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              ; and who queſtions
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                <arrow.to.target n="marg166"/>
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              but the Cœleſtial bodies have greater Spheres of activity, than
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              theſe our elementary, frail, and mortal ones? </s>
              <s>and that Wall,
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              finally, what elſe is it but a little obſcure Earth, unapt to
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              ſhine?”</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg166"/>
                <emph type="italics"/>
              The ſphere of
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              Activity greater
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              in the Cœleſtial
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              bodies than in
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              mentary.
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              </s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              S
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              AGR. </s>
              <s>And here alſo I believe, that you very much deceive your
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              felf. </s>
              <s>But I come to the firſt objection moved by
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              Salviatus
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              ; and
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              I conſider, that to make a body appear unto us luminous, it
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              ficeth not that the rayes of the illuminating body fall upon it,
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              but it is moreover requiſite that the reflex rayes arrive to our
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              eye; as is manifeſtly ſeen in the example of that Glaſſe, upon </s>
            </p>
          </chap>
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