Hypnosis is the oldest known method of psychotherapy, and, in conjunction with psychoanalysis, is coming to the front again in the treatment of nervous cases and especially of shell shock. The term suggestion is apt to be used somewhat loosely to denote any concept offered by one person to another, but in its psychological sense it is used to denote those ideas which are slipped into the mind of a person without being submitted to his judgment; in its psychotherapeutic sense, however, it is reserved for the process of inserting ideas in the mind while the patient is in a state of artificially induced drowsiness, but not unconscious under deep hypnosis. Autosuggestion, or the insertion of ideas in the subconscious by the conscious mind of the person concerned, has been reduced to a therapeutic system by the New Nancy School of psychology, and is associated with the name of Emile Coué. It is held by this school that suggestibility, or the faculty of permitting ideas to so possess the mind that they express themselves in action, is a normal human faculty; and although it is the cause of many, or even most of the ills that both mind and body are heir to, it is not in itself a morbid condition, but is a necessary factor in educability, evil only arising when wrong ideas exploit this faculty. We can, however, equally well make use of it for the expression of good ideas, with great benefit to our character and health. Suggestion, and, in intractable cases, hypnosis, is made use of by the New Nancy School, not as a direct remedial method, but to teach the use of autosuggestion whereby the patient cures himself and is able to prevent any recrudescence of his malady. It is claimed that this method increases a person’s self-reliance instead of undermining it, and is of the greatest value, not only as a therapeutic agent, but as an educational method, and its use in this aspect is urged. But although it is of acknowledged value in the cure of disease, it is questionable whether it might not lead to artificiality and warping of the nature if applied to the growing mind that was developing along normal lines. Only the most judicious guidance could avoid this pitfall.