Undoubtedly the most valuable collection of evidence relative to the Mexican religion compiled by a Spanish churchman is the Historia General of Bernardino Sahagun, whose work, composed with scholarly care and an almost prophetic knowledge of the correct methods to be pursued in the collection of traditional material, was completed about the middle of the sixteenth century, but remained unpublished until 1830. This work has been described so repeatedly as to require no further mention here, and other notable works are included in the bibliography. Some allusion should also be made here to the works known as the Interpretative Codices, compiled by Pedro de Rios and other monks, who retained the services of native painters to execute drawings of Mexican deities or, as some believe, drew these figures themselves, the symbolism and general meaning of which they endeavoured to make plain and interpret, only too often in the light of their knowledge of the Scriptures. THE ORIGINS OF MEXICAN RELIGION The question of the origin of Mexican religion, like that of the civilization of which it was perhaps the most salient characteristic, has afforded matter for ardent controversy from the period of the discovery and conquest of the country until the present day. But, even so, it is still unsafe to dogmatize upon Mexican religious origins. At the time of the Conquest we observe Mexican religion as a highly complex faith, with a ceremonial of the most elaborate nature, a priesthood with nicely defined gradations in office, and a pantheon which had obviously been formed by the collocation of the deities of provincial and dependent tribes and peoples around a nucleus composed of the national and departmental gods of the Aztecâ. The great temple-area of Mexico-Tenochtitlan harboured a bewildering array of gods, many of which possessed separate shrines and ministrants. An intensive examination of the alien elements represented, however, tends to prove the identity of many of them with the gods of the Aztecâ, a similarity which, in numerous instances, was manifest to that people themselves and which was the result of tribal affinity or basic resemblance in religious conception. Nevertheless a residuum of unrelated deities remained, which might, perhaps, be accounted for by positing the existence of two markedly different cultures or tendencies in Mexico, barbarous and civilized. This may imply that the opposing influences which gave rise to these variations were alien to each other racially, or it may indicate that, whereas one had remained in an environment of barbarism, the other had developed and enlarged its theological and even its mythical conceptions in the light of the necessities of an advancing material civilization. Whence the seeds of that civilization came is, as has been said, matter of controversy. The existence of a system of monachism in Mexico would seem to indicate a non-American origin. Elements common to both aspects of this