This classic text has long been used as a principal resource by students and scholars of astral phenomena. A natural companion to Powell's The Etheric Double, its subject is the structure, nature, and powers of the astral body, the vehicle of feelings and emotions seen by clairvoyants as an aura of flashing colours. Based on first hand testimony by noted clairvoyants, including H.P.Blavatsky, C.W. Leadbeater, and Annie Besant, Powell's perceptive commentary is of enduring interest to all lovers of esoteric lore.