1. Dr. Rickels is Professor of Psychiatry and Pharmacology, University of Pennsylvania, 203 Piersol Building, University Hospital, 3400 Spruce St., Philadelphia, Pa. 19104, and Director of Psychopharmacology, Philadelphia General Hospital. Dr. Downing is Associate Professor of Psychology in Psychiatry, University of Pennsylvania, and Chief, Psychology Service, University of Pennsylvania Division Psychiatric Service, Philadelphia General Hospital, Philadelphia, Pa.