Crowley is hinting here at the sexual nature of the rite. When a member of the O.T.O. reached the VI° and Crowley thought him a suitable candidate for the Higher Mysteries he was invited to join the Sovereign Sanctuary of the Gnosis where these mysteries of sexual magic were revealed.
 Kama Rupa, the Desire Body, a term much used in Theosophy; it is taken from Hinduism. The physical body is ascribed to the element Earth, the emotional body or desire body, to that of Water.
 Crowley's Abbey of Thelema at Cefalu was one such college.
 Yet it might happen that the Will of the other being was to invite the Magician to indwell its instrument.
 Especially on the subject of the Wand or the Disk.
 This is the magical aspect of eating animal food, and its justification, or rather the reconciliation of the apparent contradiction between the carnivorous and humanitarian elements in the nature of Homo Sapiens.