Agricola, Georgius, De re metallica, 1912/1950
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              in order that, if there is in the cakes any alum or vitriol or saltpetre capable
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              of injuring the metals, although it rarely does injure them, the water may
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              remove it and make the cakes soft. </s>
              <s>The solidified juices are nearly all
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              harmful to the metal, when cakes or ore of this kind are smelted. </s>
              <s>The cakes
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              which are to be roasted are placed on wood piled up in the form of a crate,
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              and this pile is fired
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              22
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              <s>A—PITS. B—WOOD. C—CAKES. D—LAUNDER.</s>
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              <s>The cakes which are made of copper smelted from schist are first thrown
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              upon the ground and broken, and then placed in the furnace on bundles of
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              faggots, and these are lighted. </s>
              <s>These cakes are generally roasted seven
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              times and occasionally nine times. </s>
              <s>While this is being done, if they are </s>
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