This book deals with those branches of Medical Psychology which have thrown most light on the problems of Psychical Research, namely, Hypnotism, Hysteria, and Multiple Personality. The greater part of the contents had already been published in the forms of papers contributed to the Proceedings of the Society for Psychical Research between 1910 and 1922 when the book was first released.

This book is intended primarily for those readers who have had no professional training in either Medicine or Psychology, but who are anxious to keep themselves abreast of modern thought in these departments of knowledge. At the same time I hope it may prove serviceable to professional students of these subjects as a preliminary survey of the ground they will have to cover should they desire to specialize in psychotherapies or in the psychology of the abnormal.The topics discussed ...