Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb pagenum="67"/>
            <p type="main">
              <s>However, such a junction of veins sometimes disunites and in this
                <lb/>
              way it happens that the vein which was the right-hand vein becomes
                <lb/>
              the left; and again, the one which was on the left becomes the right.</s>
            </p>
            <p type="main">
              <s>Furthermore, one vein may be split and divided into parts by some hard
                <lb/>
              rock resembling a beak, or stringers in soft rock may sunder the vein and
                <lb/>
              make two or more. </s>
              <s>These sometimes join together again and sometimes
                <lb/>
              remain divided.</s>
            </p>
            <figure number="33"/>
            <p type="caption">
              <s>A, B—VEINS DIVIDING. C—THE SAME JOINING.</s>
            </p>
            <p type="main">
              <s>Whether a vein is separating from or uniting with another can be deter­
                <lb/>
              mined only from the seams in the rocks. </s>
              <s>For example, if a principal
                <lb/>
              vein runs from the east to the west, the rock seams descend in depth
                <lb/>
              likewise from the east toward the west, and the associated vein which
                <lb/>
              joins with the principal vein, whether it runs from the south or the north,
                <lb/>
              has its rock seams extending in the same way as its own, and they do not
                <lb/>
              conform with the seams in the rock of the principal vein—which remain
                <lb/>
              the same after the junction—unless the associated vein proceeds in the same
                <lb/>
              direction as the principal vein. </s>
              <s>In that case we name the broader vein the
                <lb/>
              principal one, and the narrower the associated vein. </s>
              <s>But if the principal
                <lb/>
              vein splits, the rock seams which belong respectively to the parts, keep
                <lb/>
              the same course when descending in depth as those of the principal vein.</s>
            </p>
            <p type="main">
              <s>But enough of
                <emph type="italics"/>
              venae profundae,
                <emph.end type="italics"/>
              their junctions and divisions. </s>
              <s>Now
                <lb/>
              we come to
                <emph type="italics"/>
              venae dilatatae.
                <emph.end type="italics"/>
              </s>
              <s> A
                <emph type="italics"/>
              vena dilatata
                <emph.end type="italics"/>
              may either cross a
                <emph type="italics"/>
              vena profunda,
                <emph.end type="italics"/>
                <lb/>
              or join with it, or it may be cut by a
                <emph type="italics"/>
              vena profunda,
                <emph.end type="italics"/>
              and be divided into parts.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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