Offers a comprehensive picture of the streams of life, passing from stage to stage of development, to the level of humanity and beyond. This work is the last of a series of 5 books that present a coherent and sequential account of the finer bodies of Man and his role in the Scheme of Evolution. The other books in the series are: The Etheric Double, The Astral Body, The Mental Body and The Causal Body and the Ego.

Arthur Edward Powell (1882-1969), was a Theosophist whose books were published beginning in the early 1900s. He studied the major esoteric works of Helena Blavatsky, Charles Webster Leadbeater and Annie Besant.