Size of electric response as % of normal 
61 
From the results obtained with two kinds of narcotics it can 
be concluded with certainty that the intensity of nervous impulse 
set up in the narcotised region is not dependent on the intensity 
of the nervous impulse which enters into this region, in the other 
words, the validity of “ all or none principle ” for the narcotised 
region of nerve was confirmed. 
Fig. 17. (b) 
I. before narcosis. Ilf. during narcosis (after 35 min.) 
II. during narcosis (after 10 min.) IV. during narcosis (after 20 min.) 
20 18 17 10 
Strength of stimuli (figures indicate coil distance in cm.) 
2. In the experiments above mentioned the two nervous im¬ 
pulses of different intensities were passed through the narcotised 
region as, so to speak, “ natural” stimuli of the different intensi¬ 
ties. Further experiments are needed to determine whether the 
size of the nervous impulse set up by the “ external ” stimulus