82 ANIMAL ELECTRICITY. LFXTURE IV. 



under anodic influence. Here is the record of an 

 experiment {hg. 35) that will serve as a memor- 

 andum of the fact. Anyone who may desire further 

 acquaintance with the doubts and complications of 

 which this very domestic-looking experiment is the 



Before. During A. After. 



Anodic diminution of excitability. 



Before. During K. After. 



Kathodic augmentation of excitability. 



Fig. 35. — Influence of a polarising current upon the electrical excitability of 

 human nerve. (From Waller and de Watteville, P/u7. Trans. R. S., 1882). 



settlement, may refer to the literature of the subject, 

 from which it may be gathered that a verifica- 

 tion on human nerve of Pfluger's universally-admitted 

 principles r^ isolated frog's nerves was by no means a 

 matter of course, but had to be cleared before it was 

 clearly visible. 



