Investigation has made it probable that the Mexicans or Aztecs went to the Valley of Mexico from the south. Mr. Squier says: “The hypothesis of a migration from Nicaragua and Cuscutlan to Anahuac is altogether more consonant with probabilities and with tradition than that which derives the Mexicans from the north; and it is a significant fact, that in the map of their migrations presented by Gemelli, the place of the origin of the Aztecs is designated by the sign of water (_atl_ standing for Aztlan), a pyramidal temple with grades, and near these a palm-tree.” Humboldt thought this indicated a southern origin. Communities of Aztecs still exist as far south as Nicaragua and Costa Rica, with some variations in their speech, but not so great, probably, as to make them unintelligible to each other. The Spanish historian, Oviedo, called attention to the fact that an isolated community of Aztecs was found occupying the territory between Lake Nicaragua and the Pacific. They were called Niquirans, and Mr. Squier seems to have verified this fact. The result of his investigation is that the people of the district specified are Aztecs, and that, “from the comparative lateness of the separation or some other cause,” their distinguishing features were easily recognized, their speech being nearly identical with the native speech heard in the Valley of Mexico. Oviedo said of them: “The Niquirans who speak the Mexican language have the same manners and appearance as the people of New Spain (Mexico).” In the neighboring districts, communities closely related to the Mayas are found, and others that appear to belong to the Toltec family. Aztecs are found still farther south, and there appear to be conclusive reasons for believing that Montezuma’s people went from the south to Anahuac or Mexico. According to the native histories as reported by Clavigero, the Aztecs began their migration northward from Aztlan about the year 1160 A.D., and founded the more important of their first settlements in the Valley of Mexico about the year 1216 A.D., a little over three hundred years previous to the Spanish invasion. Another result of investigation adds a century to this estimate. This result is reached as follows: the Mexicans stated constantly that their calendar was reformed some time after they left Aztlan, and that in the year 1519 eight cycles of fifty-two years each and thirteen years of a ninth cycle had passed since that reform was made. This carries back the beginning of their migration considerably beyond the year 1090 A.D.