Agricola, Georgius, De re metallica, 1912/1950

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              neath which is the sixth stratum, likewise dark, but rough and three feet
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              thick. </s>
              <s>Afterward occurs the seventh stratum, likewise of dark colour, but
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              still darker than the last, and two feet thick. </s>
              <s>This is followed by an eighth
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              stratum, ashy, rough, and a foot thick. </s>
              <s>This kind, as also the others,
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              is sometimes distinguished by stringers of the stone which easily melts in
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              fire of the second order. </s>
              <s>Beneath this is another ashy rock, light in
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              weight, and five feet thick. </s>
              <s>Next to this comes a lighter ash-coloured
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              one, a foot thick; beneath this lies the eleventh stratum, which is dark and
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              very much like the seventh, and two feet thick. </s>
              <s>Below the last is
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              a twelfth stratum of a whitish colour and soft, also two feet thick; the
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              weight of this rests on a thirteenth stratum, ashy and one foot thick, whose
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              weight is in turn supported by a fourteenth stratum, which is blackish and
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              half a foot thick. </s>
              <s>There follows this, another stratum of black colour,
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              likewise half a foot thick, which is again followed by a sixteenth stratum
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              still blacker in colour, whose thickness is also the same. </s>
              <s>Beneath this, and
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              last of all, lies the cupriferous stratum, black coloured and schistose, in which
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              there sometimes glitter scales of gold-coloured pyrites in the very thin sheets,
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              which, as I said elsewhere, often take the forms of various living things.
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              15
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              <s>The miners mine out a
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              vena dílatata
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              laterally and longitudinally by
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              driving a low tunnel in it, and if the nature of the work and place permit, they
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              sink also a shaft in order to discover whether there is a second vein beneath
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              the first one; for sometimes beneath it there are two, three, or more similar
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              metal-bearing veins, and these are excavated in the same way laterally and
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              longitudinally. </s>
              <s>They generally mine
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              venæ dilatatæ
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              lying down; and to </s>
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