The article consists mainly of a rather lengthy and repetitious case history in which the author, without much assistance from the patient and with rather superficial and direct interpretation of the material, supports his hypothesis that in hebephrenics certain dynamics are present. These dynamics differ substantially from those found in the usual neurotic. 1. The ego in the hebephrenic constructs a many-layered defensive system. The patient is in continuous conflict between his incestuous wishes, his polymorphous sexuality, and his guilt and anxiety. He fears his aggressive destructive impulses reflected in phallic wishfulfilling fantasies, which in turn are defenses against castrative inferiority feelings. 2. Delusions perform the same function for the hebephrenic that