1. Dr. Birley is the Dean of the Institute of Psychiatry, De Crespigny Park, Denmark Hill, London, SE5 8AF, where Dr. Rodnight is Professor of Neurochemistry and Drs. Checkley and Don are research workers in the Departments of Psychiatry and Biochemistry. Dr. Williams is the Director of the Liver Research Unit, King’s College Hospital, London. Address reprint requests to Dr. Rodnight.