Collectanea Hermetica Volume I: Hermetic Arcanum. This book was a part of curriculum studied by members of the original Order of the Golden Dawn. This essay presents the secret work of the Hermetic philosophy wherein the secrets of nature and art concerning the matter of the philosophers' stone and the manner of working are explained in an authentic and orderly manner. The volumes of Westcott's Collectanea Hermetica appeared over there three years from 1893 to 1896 when the Golden Dawn was at its peak. In every volume the intellectual integrity of the authors is evident, as is an eagerness to bring academic respectability to subjects derided by their contemporaries. This is the first corrected edition since it was originally published in 1893. The edition was Edited Darcy Kuntz. General Preface to the Collectanea Hermetica Series by Robert A. Gilbert and an Introduction by Robert Allen Bartlett.