It was particularly interesting to find that, in assuming that certain names designated different native deities, the early Spanish writers had committed a mistake as great as though someone, reading the litany of the Virgin in a Catholic prayer-book, for the first time, inferred that it was a series of invocations addressed to distinct divinities, amongst whom figured the “morning star,” a “mirror of justice,” and a “mystical rose,” etc. An examination of the texts of several native prayers preserved, established that the Mexicans addressed their prayers to a supreme Creator and ruler, whom they termed “invisible, incomprehensible and impalpable,” and revered as “the father and mother of all.” Some of their so-called idols were, after all, either attempts to represent in objective form, the attributes of the divine power, the forces of nature, the elements, etc., or rebus figures. As these “gods” or “idols” are enumerated farther on and are exhaustively treated in my commentary of the Biblioteca Nazionale manuscript, now in press, it suffices for my present purpose merely to mention here that the most mysterious figure of Mexican cosmogony, Tezcatlipoca, whose symbolical name literally means “shining mirror,” proved to be identical with Mictlantecuhtli, the lord of the underworld, whose title may also be interpreted as “the ruler or regent of the North,” since Mictlampa is the name of this cardinal point. The Codex Fuenleal (Anales del Museo Nacional, Mexico, tomo II, p. 88) preserves an important myth relating how Tezcatlipoca, after having been the sun, was cast down from this supreme position by Huitzilopochtli, “descended to the water,” but had arisen again in the shape of an ocelot, and transformed himself into the constellation of Ursa Major. According to Sahagun the native name of this star-group was Citlal-Colotl or “star scorpion.” Reference to Nahuatl dictionaries revealed that this insect had doubtlessly been named colotl on account of its habit of recurving its tail when enraged. The Nahuatl verb coloa means, to bend over or twist something, the adjective coltic is applied to something bent over or recurved. The noun colotli, which is almost identical with colotl, means “the cross-beams, the mounting, branch or handle of a cross” (“armadura de manga de cruz.” See Molina’s dictionary). The above facts show that the idea underlying the name for Ursa Major is primarily that of “something bent over or recurved.” It is obvious that the form of the constellation answers to this description. It is, moreover, extremely significant to find, in the Maya language also, a certain resemblance between the words for scorpion and for a cross. This, in Maya, is zin-che and that for a scorpion is zin-au. The above data justify the induction that the native conception of a cross was connected with the idea of its arms being bent over or recurved, as in the Mexican calendar-swastika.