I now turn from the wild hunting tribes who peopled the shores of the Great Lakes and the fastnesses of the northern forests to that cultivated race whose capital city was in the Valley of Mexico, and whose scattered colonies were found on the shores of both oceans from the mouths of the Rio Grande and the Gila, south, almost to the Isthmus of Panama. They are familiarly known as Aztecs or Mexicans, and the language common to them all was the _Nahuatl_, a word of their own, meaning "the pleasant sounding." Their mythology has been preserved in greater fullness than that of any other American people, and for this reason I am enabled to set forth in ampler detail the elements of their hero-myth, which, indeed, may be taken as the most perfect type of those I have collected in this volume. §1. _The Two Antagonists._ The culture hero of the Aztecs was Quetzalcoatl, and the leading drama, the central myth, in all the extensive and intricate theology of the Nahuatl speaking tribes was his long contest with Tezcatlipoca, "a contest," observes an eminent Mexican antiquary, "which came to be the main element in the Nahuatl religion and the cause of its modifications, and which materially influenced the destinies of that race from its earliest epochs to the time of its destruction."[1] [Footnote 1: Alfredo Chavero, _La Piedra del Sol_, in the _Anales del Museo Nacional de Mexico_, Tom. II, p. 247.] The explanations which have been offered of this struggle have varied with the theories of the writers propounding them. It has been regarded as a simple historical fact; as a figure of speech to represent the struggle for supremacy between two races; as an astronomical statement referring to the relative positions of the planet Venus and the Moon; as a conflict between Christianity, introduced by Saint Thomas, and the native heathenism; and as having other meanings not less unsatisfactory or absurd. Placing it side by side with other American hero-myths, we shall see that it presents essentially the same traits, and undoubtedly must be explained in the same manner. All of them are the transparent stories of a simple people, to express in intelligible terms the daily struggle that is ever going on between Day and Night, between Light and Darkness, between Storm and Sunshine.