The recent results of the systematic exploration of the great mounds at Teotihuacan have been quite surprising, and have shed new light on the archeology of the central plateau of Mexico. Even more important is the discovery of culture sequences in stratified deposits in the valley of Mexico, the investigations showing three distinct culture layers distinguished by the character of the pottery. Of great significance are the discoveries recently made under the great lava flow called the Pedregal, at the very edge of the City of Mexico, where the artifacts correspond _in toto_ with those found in the bottom layer of the stratified deposits.[114] These discoveries mark a great advance in our knowledge of the history of ancient Mexico, but, as we have before stated, they are only a beginning. Buried underground are the “books” the student must study, if ever the tangled history of Middle America is to become known and the story of the development of this exceedingly interesting division of the human race is to be recorded. NOTES [1] See Saville, The Goldsmith’s Art in Ancient Mexico, _Museum of the American Indian, Heye Foundation, Indian Notes and Monographs_, 1920. [2] Gonzalo Fernández de Oviedo y Valdés, Historia General y Natural de las Indias, edition of the Real Academia de la Historia, tomo I, primera parte, lib. XVII, caps, VIII-XVIII, pp. 502-537, Madrid, 1851. [3] The Itinerary of Grijalva, written by chaplain Juan Díaz, was undoubtedly recorded in Spanish, but we know it only from the Italian translation of 1520. It was translated into Spanish by Joaquin Garcia Icazbalceta and published by him in his _Documentos para la Historia de México_, tomo I, Mexico, 1858. A translation into English, with translations of other accounts, relating to this voyage, will appear in the _Publications of the Cortes Society_ under the title, The Voyage of Juan de Grijalva to Yucatan and the Mexican Coast in 1518. [4] We quote here from the edition of Bernal Díaz published by the Hakluyt Society, bearing the title, The True Conquest of New Spain, translated into English by Alfred Percival Maudslay. The citation is from vol. I, pp. 48-49, London, 1908. [5] Bernal Díaz, op. cit., vol. I, p. 53. In the work of Torquemada, Monarchia Indiana, is an important statement bearing on this matter, of which we give the following translation _in extenso_: