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Rh of which they are all constructed is the same hard, black stone which constitutes the relics at Tula, and that neither in the large collections of



the Museum of Mexico, nor anywhere else, are there any articles, of assumed Aztec origin, composed of like material. Hence an apparently legitimate inference that the latter have a common origin with the constructions at Tula, and are relics of the Toltecs or older nations, and not of the Aztecs.