“…This hesitation reflects the controversy then current about the possible existence of active vasodilators among the sympathetic nerve fibers to the skin (e.g. , 1937;Hyndman & Wolkin, 1941;Lewis & Pickering, 1931) . However, subsequent research has disproved this possibility (see Kimber, Gray, Stackpole, Leavell, & Miller, 1966).…”