Galilei, Galileo, The systems of the world, 1661

Table of figures

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          <chap>
            <pb xlink:href="065/01/382.jpg" pagenum="372"/>
            <p type="margin">
              <s>
                <margin.target id="marg706"/>
                <emph type="italics"/>
              The firſt
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              vers and inventers
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              of things ought to
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              be admired.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg707"/>
                <emph type="italics"/>
              The true cauſe
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              of the
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              tion of vertue in
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              the Magnet, by
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              means of the
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              ming.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg708"/>
                <emph type="italics"/>
              Of a new effect
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              its neceſſary that
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              the cauſe be
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              wiſe new.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg709"/>
                <emph type="italics"/>
              It is proved,
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              that Iron conſists
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              of parts more
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              til, pure, and
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              pact than the
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              net.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg710"/>
                <emph type="italics"/>
              A ſenſible proof
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              of the impurity of
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              the Magnet.
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              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg711"/>
              * The
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              hereby
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              that the
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              doth not all
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              ſiſt of magnetick
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              matter, but that
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              the whiter ſpecks
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              being weak, thoſe
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              other parts of the
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              Loadſtone of a
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              more dark &
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              ſtant colour,
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              tain all that vertue
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              wherewith bodies
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              are attracted.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg712"/>
              * A common
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              ſewing needle.</s>
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            <p type="main">
              <s>SAGR. </s>
              <s>Your whole diſcourſe hath been in my judgment very
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              concluding, and this experiment of the Needle hath made me
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              think it little inferiour to a Mathematical Demonſtration; and
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              I ingenuouſly confeſſe, that in all the Magnetick Philoſophy, I
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              never heard or read any thing, that with ſuch ſtrong reaſons
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              gave account of its ſo many admirable accidents, of which, if the
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              cauſes were with the ſame perſpicuity laid open, I know not
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              what ſweeter food our Intellects could deſire.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>In ſeeking the reaſons of concluſions unknown unto
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              us, it is requiſite to have the good fortune to direct the
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              courſe from the very beginning towards the way of truth; in
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              which if any one walk, it will eaſily happen, that one ſhall meet
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              with ſeveral other Propoſitions known to be true, either by
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              putes or experiments, from the certainty of which the truth of
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              ours acquireth ſtrength and evidence; as it did in every reſpect
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              happen to me in the preſent Probleme, for being deſirous to
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              ſure my ſelf, by ſome other accident, whether the reaſon of the
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              Propoſition, by me found, were true; namely, whether the
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              ſtance of the Magnet were really much leſſe continuate than that
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              of Iron or of Steel, I made the Artiſts that work in the Gallery
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              of my Lord the Grand Duke, to ſmooth one ſide of that piece
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              of Magnet, which formerly was yours, and then to poliſh and
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              burniſh it; upon which to my ſatisfaction I found what I deſired.
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              </s>
              <s>For I diſcovered many ſpecks of colour different from the reſt,
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              but as ſplendid and bright, as any of the harder ſort of ſtones;
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              the reſt of the Magnet was polite, but to the tact onely, not
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              being in the leaſt ſplendid; but rather as if it were ſmeered over
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              with ſoot; and this was the ſubſtance of the Load ſtone, and
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              the ſhining part was the fragments of other ſtones intermixt
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              therewith, as was ſenſibly made known by preſenting the face
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              thereof to filings of Iron, the which in great number leapt to
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              the Load-ſtone, but not ſo much as one grain did ſtick to the
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              ſaid ſpots, which were many, ſome as big as the fourth part of
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              the nail of a mans finger, others ſomewhat leſſer, the leaſt of
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              all very many, and thoſe that were ſcarce viſible almoſt
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              merable. </s>
              <s>So that I did aſſure my ſelf, that my conjecture was
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              true, when I firſt thought that the ſubſtance of the Magnet
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              was not cloſe and compact, but porous, or to ſay better,
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              gy; but with this difference, that whereas the ſponge in its
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              cavities and little cels conteineth Air or Water, the Magnet hath
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              its pores full of hard and heavy ſtone, as appears by the
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              ſite luſtre which thoſe ſpecks receive. </s>
              <s>Whereupon, as I have ſaid
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              from the beginning, applying the ſurface of the Iron to the
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              perficies of the Magnet the minute particles of the Iron, though
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              perhaps more continuate than theſe of any other body (as its </s>
            </p>
          </chap>
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    </archimedes>
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