496 COMPARATIVE ELECTRO-PHYSIOLOGY 



The next experiment consists of a comparison of the 

 simultaneous variations of receptivity and responsivity. 

 Alcohol is applied at R' and E, the formula thus being 

 R'aic.E alc .. And we find here in confirmation of our 

 previous results that, on account of the opposite effects of 

 this agent on the receptive and responsive excitabilities, the 

 resultant response is downwards (fig. 306), showing that the 

 receptivity has been relatively exalted. Thus the experi- 

 ments which I have here described show that the same agent 

 may have different effects on receptive and responsive 

 excitability, and thus accentuate the necessity of clearly 

 distinguishing between the two. 



