George Robert Stow Mead 
Doctrine of the Subtle Body in Western Tradition [PDF ebook] 
An Outline of What the Philosophers Thought and Christians Taught on the Subject

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Conjectures concerning it vary with every stage of culture and differ within every stage. But the underlying conception invariably holds its ground, and makes good its claim to be one of the most persistent persuasions of mankind in all ages and climes.