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198  The largest specimen of these substances which has ever been described, has escaped the notice of all the philosophers who have written upon the subject.

Walckcnaer in a note to Azara's Travels, upon the mass of iron and nickel found in the Chaco, says that two other such masses have been discovered; one which Pallas has described, and one which was dug up at Aken near Magdebourg. Gaspar de Villagra, in his Historia de la Nueva Mexico, mentions a fourth, evidently of the same nature as these, and considerably larger than the largest of them. The tradition of the natives concerning it supports the most probable theory of it's origin. A demon in the form of an old woman, appeared to two brothers, who were leading a horde or swarm of the ancient Mexicans, in search of a new country; she told them to separate, and threw down this block of