Jan KRYSPIN, address: 99 Avenue Rd. #303 Toronto, Ontario, Can., M5R 1S2, phone 416 961-1140 (home) 22 Aldenham Cres. Don Mills, Ont. M3A 1S2, phone 416 447-2394. Affiliation: University of Toronto, Departments of Medicine and Physiology. Education: M.D.(1950), Ph.D.(C.Sc., 1959); medicine, philosophy, physics, engineering, clinical physiology. Interest in Popper: Popper's personality. Activities: consulting, director of pain clinic.