130 ANIMAL ELECTRICITY. LECTURE VI. 



carbonic acid, and we concluded therefrom that 

 tetanisation gives rise to an evolution of carbonic 

 acid within the nerve. 



Fig. 59. — Effect of COo on A. (primary augmentation). 



Fig. 60. —Effect of Tetanisation on A. (augmentation). 



We are naturally led to test the effects of car- 

 bonic acid upon these extrapolar currents A. and K., 

 which we have just found to be subject to modifica- 



