This history traces psychotherapy from the Stone Age to the present and discusses magic, faith-healing, witchcraft, early asylums for the insane, Christian Science, rest cures, animal magnetism, hypnotism, various modifications of psychoanalysis, mental hygiene, and group methods of psychotherapy. The author in his preface states that this is a rewriting of his earlier book entitled "The Mind of Man," published in 1937. The present title is taken from a quotation in Seneca's "Naturales Quaestiones." The author believes the factors entering into psychotherapy must always include "the primitive sense of magic, an aspect of faith displaced to the therapist and a re-enactment of infantile feelings within the transference situation." The best chapter is that on mental hygiene. There is an index.