In a previous communication it was stated that the electrical signs a of secreto-motor action by tetanisation of the sciatic nerve are a demonstrable in the pads of a cat’s foot after death, best so during; the second half-hour after death, when the action of the nerve upon muscles of the limb has ceased. The subsequent study of these effects, by means of electrometer records, has brought out with great distinctness the chief classical events with which we are familiar in the case of the contraction of voluntary muscle, viz., the latency and course of a single response to a single stimulus, the super-position of two or more responses and the composition of tetanus, summation of stimuli, fatigue and recovery, and the staircase phenomenon. The difference between the muscular and the secreto-motor series of phenomena is principally a difference of time, the former being about 100 times more rapid than the latter.