Nagaulism: A Study in Native American Folk-Lore and History:

Nagualism was a powerful and mysterious cult which united Mexican and Central American tribes, belonging to different linguistic stocks, into organized opposition against the government and religion of their conquerors. The members of this intertribal organization 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 days the thoughts and forms of a long-sup...