The Magus

The Magus is one of the primary sources for the study of ceremonial magic, and for a long time was one of the rarest and most sought after of the 19th century grimoires. Barretts' magnum opus embodies deep knowledge of Alchemy, Astrology, and the Kabbalah, and has been cited by the Golden Dawn and other occult and esoteric movements as source material. Written in 1801 in the middle of the 'Age of Reason', sandwiched between Newton and Darwin, this was possibly the last epoch that a work like this could be composed.