A word may now be said concerning the “Toltec” culture of the Mexican valley. The fact that this is related to the early culture of the Maya is, as said before, obvious. Many points of similarity exist in religious symbolism, art (such as the interlaced trapezoidal sign described above), glyphs surrounded by a cartouche, and the bar-form of the numeral five. If my dating of the monuments be accepted provisionally, and also the suggestion that the calendar had its origin with the Maya, then it follows necessarily that the Toltec culture was due at least to Maya inspiration. The myth of the arrival of the god Quetzalcoatl, inventor of the calendar, symbolizes the spread of Maya culture northwards. There are so many instances of the god being taken as the representative of his people, and I have already shown how the high mysterious creator-god Kukulkan seems to have lost dignity when he became personified as a tribal leader. The myth of the immigrant Nahua tribes awaiting the “dawn for the administration of society” at Teotihuacan then represents their first contact with the culture derived from the Maya. So far the matter is simple, but a difficulty now arises. The last Maya date in the long count, at Chacula on the Chiapas border, falls about the middle of the fourth century A.D. The Annals of Quauhtitlan give the foundation of the Toltec state as 752 A.D. The migration-myth last mentioned states that the Toltec were with the other Nahua immigrants at Teotihuacan when the “dawn” appeared. These Toltec are definitely stated to have been Nahua-speakers, while the name of the first Toltec ruler, Mixcoamazatzin, is distinctly Nahua. Finally, the list of Toltec rulers, seven only in number, is far too short to account for the thick stratum of Toltec remains at Azcapotzalco. The only explanation possible surely must be the following: The early Maya culture had slowly crept up into the Mexican valley, through western Chiapas, Oaxaca and Teotitlan, becoming somewhat attenuated in the process. There it persisted for some centuries without striking development, and perhaps gradually deteriorating. Then began the southerly drift of the Nahua tribes, of whom the first to arrive, the Toltec, imposed themselves as a ruling caste upon the agricultural population, adopting their mode of life and culture, and developing the latter in accordance with their own particular genius, but imposing their own language upon the tribes whom they welded into an empire. But the pressure from the north continued, wave after wave of “Chichimec” migration broke upon the valley. The Toltec power fell, and the incursion of the wilder tribes gave rise to migrations, such as those of the Olmec, Quiché and Kakchiquel, which followed for the most part an easterly route, at any rate in their initial stages. In the valley, the history of the Toltec was reflected in the short-lived attempts of the Chichimec and Tepanec to establish empires, but was practically repeated by the