[Crowley (Aleister)], "The Master Therion". Magick in Theory and Practice [Book Four. Part Three], 4 vol. in 1, first edition, first issue, presentation inscription from the author in Greek "To Mega Therion 666, 9 = 2 A. A., Logos Ainos Thelema 93" facing title, colour plate, occasional pencil notes to margins, printed prospectus loosely inserted with a few notes and corrections in ink and pencil, bookplate of A. E. Richardson to pastedown, contemporary red half calf with lettering and hexagram design in black to upper cover after design of original wrappers, spine lettered in gilt, t.e.g., others uncut, [Yorke 62Ca], large 8vo, Paris, Lecram Press, 1929.

⁂ An inscribed copy of Crowley's most celebrated work, possibly the author's own copy.

Magick in Theory and Practice is Crowley's comprehensive guide to Thelema and wider Magick practices, it is his most enduring work and there are very few known inscribed copies. Mega Therion was the name given to the Beast in the Book of Revelations and was adopted as a name by Crowley following a ritual in 1916. It is possible then that the inscription by Crowley is addressed to this alter ego.