The author of this book has for some years been interested in the subject as set forth in the title, and he has written upon it on several occasions. He has gathered his previous productions, elaborated them here and there, put them together into a coherent volume, and produced a scholarly treatise on the subject. He has brought a tremendous mass of evidence, historical, mythological, and philological, together, and illuminated it by applying the principles of psychoanalysis and interpreting it accordingly. He finds, therefore, that these three subjects—Nightmare, Witches, and Devils—are closely united in their significance in the unconscious and find expression in dreams and superstitions and in religion. The argument is a close one and becomes very highly technical in some places, particularly in dealing with the comparative philology of the subject. No short abstract can adequately present the subject matter of this elaborate presentation, but it is worth while reading from many points of view.

White.