The faults of hypnosis as practiced by an earlier generation lay not only in certain dangers and limitations inherent in the procedure, but in the generally inadequate knowledge of psychodynamics which prevailed at the time. The revival of hypnotism in recent years has shown promise only when combined with a sound orientation in psychopathology. Lecron presents an excellent exposition of the technique and phenomena of hypnosis. He reports on modern methods of evoking past memories, suggesting dreams and employing other devices which have become familiar in hypnotherapy.