102 
stimulating electrode B. Since the distance from B to the distal end 
öf the chamber is 6 mm., the nervous impulse would start from 
just outside the narcotising chamber or from just inside of it where 
the nerve, owing to the influence from normal part, is less deeply 
narcotised. 
B. An attempt to show that the impulse 
DOES NOT START FROM WITHIN THE NARCOTISED REGION OF NERVE 
BY “ INSIDE STIMULUS ” AFTER THE CONDUCTION 
FAILED FROM “ OUTSIDE ELECTRODE.” 
I. Dr. Hayashi took a narcotising chamber of 18 mm. in 
diameter and passed through it a nerve-muscle preparation in such 
a manner that the distance from electrode B to the distal wall (W) 
of the chamber is equal to that from electrede C to the distal 
chamber wall, so that BW=CW (Fig. 34). At first, without 
narcosis, the curves of the maximal muscle twitches were registered 
on the rotating myograph, applying at B and at C the stimuli 
which were only just maximal. From these curves the latent 
period (1) of the muscle twitch in case of stimulating at B and that 
(!') at C were determinnd in the same way as described in the 
section A. Then the narcosis was commenced and the nerve was 
exposed to the action of narcotics (urethane or ether) until the con¬ 
duction failed from outside electrode A. At or just after this stage 
of narcosis the coil distance for threshold stimulus at B was deter¬ 
mined which was in the most cases about 230 mm. The secondary