Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="38"/>
              hay, which is called the
                <emph type="italics"/>
              cordum,
                <emph.end type="italics"/>
              is cut with scythes in the month of
                <lb/>
              September. </s>
              <s>Therefore in places where the grass has a dampness that is not con­
                <lb/>
              gealed into frost, there is a vein beneath: also if the exhalation be excessively
                <lb/>
              hot, the soil will produce only small and pale-coloured plants. </s>
              <s>Lastly, there
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              are trees whose foliage in spring time has a bluish or leaden tint, the upper
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              branches more especially being tinged with black or with any other unnatural
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              colour, the trunks cleft in two, and the branches black or discoloured.
                <lb/>
              </s>
              <s>These phenomena are caused by the intensely hot and dry exhalations
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              which do not spare even the roots, but scorching them, render the trees
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              sickly; wherefore the wind will more frequently uproot trees of this kind
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              than any others. </s>
              <s>Verily the veins do emit this exhalation. </s>
              <s>Therefore, in a
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              place where there is a multitude of trees, if a long row of them at an unusual
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              time lose their verdure and become black or discoloured, and frequently fall
                <lb/>
              by the violence of the wind, beneath this spot there is a vein. </s>
              <s>Likewise
                <lb/>
              along a course where a vein extends, there grows a certain herb or fungus
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              which is absent from the adjacent space, or sometimes even from the neigh­
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              bourhood of the veins. </s>
              <s>By these signs of Nature a vein can be discovered.</s>
            </p>
            <p type="main">
              <s>There are many great contentions between miners concerning the forked
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              twig
                <emph type="sup"/>
              21
                <emph.end type="sup"/>
              , for some say that it is of the greatest use in discovering veins, and
                <lb/>
              others deny it. </s>
              <s>Some of those who manipulate and use the twig, first cut
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              a fork from a hazel bush with a knife, for this bush they consider more
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              efficacious than any other for revealing the veins, especially if the hazel </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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