Opus Mago-Cabbalisticum et Theosophicum In Which the Origin, Nature, characteristics, and Use of Salt, Sulpher, and Mercury are Described in Three Parts - Georg von Welling, Translated by Joseph G. McVeigh, Edited by Lon Milo DuQuette

"For the modern student of the Western Mystery Traditions, it is impossible to overestimate the importance of von Welling's work. Its influence can be traced through the doctrines and teachings of a host of European esoteric institutions--even those that