ANIMAL ELECTRICITY. — LECTURE VI. 



131 



tion by ether and chloroform ; and as soon as we 

 have witnessed the effects of carbonic acid upon 

 these currents, our next obvious step is to test upon 

 them the effects of prolonged tetanlsation. 



Fig. 61. — Effect of CO^ on A. (primary diminution, secondary augmentation). 



Fig. 62. — Effect of Tetanisation on A. (diminution). 



The effects produced by carbonic acid — and I may 

 add, by tetanisation — are very characteristic. Their 

 description may best be given by the exhibition 

 of a series of representative experiments. Here, for 

 example, is a group of four such experiments, in 



