are as distinctively South American as the Mississippian and the Aztec are distinctively North American.
Were the divisions in a treatment of American Indian myth to follow the rationale of pre-Columbian ethnography,[2] the key-group would be found in the series of civilized or semi-civilized peoples of the mainly mountainous and plateau regions of the western continental ridge, roughly from Cancer to Capricorn, or with outlying spurs from about 35° North (Zuñi and Hopi) to near 35° South (Calchaqui-Diaguité). Within this region native American agriculture originated, and along with agriculture were developed the arts of civilization in the forms characteristic of America; while from the several centres of the key-group agriculture and attendant arts passed on into the plains and forests regions and the great alluvial valleys of the two continents and into the archipelago which lies between them. In each continent there is a region—the Boreal and the Austral—beyond the boundaries of the native agriculture, and untouched by the arts of the central civilizations, yet showing an unmistakable community of ideas, of which (primitive and vague as they are) recurrent instances are to be found among the intervening groups. Thus the plat and configuration of autochthonous America divides into cultural zones that are almost those of the hemispherical projection, and Into altitudes that are curiously parallel to the continental altitudes: the higher civilizations of the plateaux, the more or less barbarous cultures of the unstable tribes of the great river basins, and the primitive development of the wandering hordes of the frigid coasts. The primitive stage may be assumed to be the foundational one throughout both continents, and it is virtually repeated in the least advanced groups of all regions; the intermediate stage (except in such enigmatical groups as that of the North-West Coast Indians of North America) appears to owe much to definite acculturation as a consequence of the spread of the arts and industries developed by the most advanced peoples. More-
