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Utilissimum est, contraque fuscis et obscuris nigrum.”--_Plinii_, xxxv. 15. What the _alumen rotundum_ was, is not so intelligible.[108] [107] Sum of Perfection, chap. 3. 2. Geber gives an account of mining and metallurgy; and even the influence of fashion, even in science, and of gold, and afterwards in the KSC Industrial Area were.