Though practically all the supernatural powers were personified in human form, yet traces are found of more direct worship of nature in Tlaxcala, where, according to Motolinia, altars were erected to trees, and four altars might be found arranged round a spring. Indications of tree-worship were also found among the Mixtec who were said to make offerings to the shadows of lofty trees. In Oaxaca, among the Mixtec and Zapotec, traces of a different kind of religion make their appearance. It is true that here too (in parts of the Mixtec territory) we have immigration legends, pointing to the supposition that a portion of the population came from the north; but other, and probably older, myths exist which narrate the birth of the human race from trees, rocks and wild beasts. Myths of this nature are far more typical of Peru as a whole than of Mexico and Central America. Another peculiarity of Mixtec and Zapotec worship is the great number of cave-temples, many of them so holy that they became centres of pilgrimage. Some of these shrines were oracular, and one of them, at Achiutla, held such a high reputation that Montecuzoma sent an embassy to consult it at the coming of the Spaniards. Human sacrifice was practised by both these tribes, though to a far less extent than by the Mexicans, the heart of the victim being held to the lips of the idol of stone or wood. Traces of lake-worship also occur, another point in common with Peru and Colombia, in so far as at Tecomastlahuaca (immediately S.E. of Cuicatlan) was a sacred lake into which the bodies of victims were thrown; and at Teotitlan was a celebrated idol which was said to have descended from heaven in the form of a bird in the midst of a luminous constellation, a myth which would seem to have certain Maya affinities, as will be seen later. At Cuilapa in the Zapotec country was current a creation legend not unlike some of the Mexican ætiological myths. According to this the creator and his progeny bore calendrical names, and these semi-deities built their palaces on a huge rock on the summit of which was a copper axe, with the edge upwards, supporting the heavens. This preliminary age was terminated by a great deluge, after which the creator repeopled the world with the human race. CHAPTER III--MEXICO: THE CALENDAR AND CALENDRICAL FEASTS