1. Dr. Wyatt is Chief and Dr. Potkin is Staff Psychiatrist, Laboratory of Clinical Psychopharmacology, Division of Special Mental Health Research, Intramural Research Program, William A. White Bldg., Rm. 536, St. Elizabeths Hospital, Washington, D.C. 20032. Dr. Murphy is Chief, Clinical Neuropharmacology Branch, National Institute of Mental Health, Bethesda, Md.