Comparison of Duration of Activity of Regular and Prolonged Acting Pro-Banthine Measured by the Galvanic Skin Response**From the Division of Dermatology, Department of Medicine, University of California at Los Angeles and Medical Service, Veterans Administration Center, General Medical and Surgical Hospital, Los Angeles 25, California and the Departments of Psychology and Engineering, University of California at Los Angeles, California.This study was aided by a grant from the G. D. Searle & Co., Chicago, Illinois.