Abstract
Isolated single nerve fibers of the toad were excited by voltages increasing linearly at varying rates. It was concluded that a linearly increasing voltage is effective in evoking an electrical response in the fiber when it rises above the rheobasic voltage at a rate greater than the minimal gradient of the fiber. Electrical responses are evoked at short (and somewhat variable) time-intervals after the stimulating voltages have reached-the rheobasic voltage.
