The cornice which finishes the first storey of the pyramid is a familiar pattern, but nothing can be concluded from these simple geometrical designs, which might be invented over and over again by different races when they began to find pleasure in tracing ornamental devices upon their buildings. Upon the tattooed skins of savages such designs may be seen, and the patterns were certainly in use among them before they had any intercourse with white men. This is the view Humboldt takes of these coincidences. That both the Egyptian king and the Mexican chief should wear a helmet with a serpent standing out from it just above the forehead, is somewhat extraordinary. Now, who built Xochicalco? Writers on Mexico are quite ready with their answer. They tell us that, according to the Mexican tradition, the country was formerly inhabited by another race, who were called _Toltecâ_, or, as we say, _Toltecs_, from the name of their city, _Tollan_, “the Reed-swamp;” and that they were of the same race as the Aztecs, as shown by the names of their cities and their kings being Aztec words; that they were a highly civilized people, and brought into the country the arts of sculpture, hieroglyphic painting, great improvements in agriculture, many of the peculiar religious rites since practised by other nations who settled after them in Mexico, and the famous astronomical calendar, of which I shall speak afterwards. The particular Toltec king to whom the Mexican historians ascribe the building of Xochicalco was called Nauhyotl, that is to say, “Four Bells,” and died A.D. 945. We are further told that just about the time of our Norman Conquest, the Toltecs were driven out from the Mexican plateau by famine and pestilence, and migrated again southward. Only a few families remained, and from them the Aztecs, Chichemecs, and other barbarous tribes by whom the country was re-peopled, derived that knowledge of the arts and sciences upon which their own civilization was founded. It was by this Toltec nation—say the Mexican writers—that the monuments of Xochichalco, Teotihuacán, and Cholula were built. In their architecture the Aztecs did little more than copy the works left by their predecessors; and, to this day, the Mexican Indians call a builder a _toltecatl_ or _Toltec_. If we consider this circumstantial account to be anything but a mere tissue of fables, the question naturally arises—what became of the remains of the Toltecs when they left the high plains of Mexico? A theory has been propounded to answer this question, that they settled in Chiapas and Yucatan, and built Palenque, Copan, and Uxmal, and the other cities, the ruins of which lie imbedded in the tropical forest.