This is not owing to its lack of importance, since for two hundred years past, as I shall show, it has been recognized as a cult, no less powerful than mysterious, which united many and diverse tribes of Mexico and Central America into organized opposition against the government and the religion which had been introduced from Europe; whose members had acquired and were bound together by strange faculties and an occult learning, which placed them on a par with the famed thaumaturgists and theodidacts of the Old World; and which preserved even into our own days the thoughts and forms of a long suppressed ritual. In several previous publications I have referred briefly to this secret sodality and its aims,4-† and now believe it worth while to collect my scattered notes and present all that I have found of value about the origin, aims and significance of this Eleusinian Mystery of America. I shall trace its geographical extension and endeavor to discover what its secret influence really was and is.