"It is requisite to know that the divine Proclus, in his Commentaries on the Timæus * of Plato, refers metals to the seven planets, and says, that lead is ascribed to Saturn, through its weight, dulness, and coldness. But electrum [or a metal composed of gold and silver] is referred to Jupiter, through the well-tempered and vivific nature of the star. In a similar manner, also, with respect to the metal which is called migma; † but the migma is more highly valued than gold, and is well tempered. Again, iron is ascribed to Mars, on account of its incisive power and sharpness; but gold to the sun, which is, as it were, the fountain of light. Copper is referred to Venus, on account of its florid nature; and also because
108:* This extract probably formed a part of a Sixth Book of Proclus on the Timæus, which is lost, as it is not to be found in any of the Five Books that are now extant. 108:† From what Proclus says of this metal, called migma, or, a mixture, it appears to be the same with orichalcum, which Plato, in the Critias or Atlanticus, says, "shines with a fiery splendour." Pliny, in list. Nat. lib. xxxiv. cap. 2, says, that this kind of metal has not existed for a long time, owing to the barrenness of the earth. It is, however, mentioned by Martianus the lawyer, who flourished in the time of Alexander Severus, as if it then existed.
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