1. Dr. Garfinkel is Associate Professor and Staff Psychiatrist, Dr. Warsh is Assistant Professor and Director, Section on Neurochemistry, and Dr. Stancer is Professor of Psychiatric Research, Department of Psychiatry, University of Toronto and Clarke Institute of PsychIatry, Toronto, Ont., Canada. Address reprint requests to Dr. Garfinkel at the Clarke Institute of Psychiatry, 250 College St., Toronto, Ont. M5T 1R8, Canada.