'36 



ANIMAL ELECTRICITY. LECTURE VI. 



(Bernstein.) We shall see that this is true for both 

 directions of current — that both An. and Kat. are 

 diminished during excitation. 



Let us begin with An., the connections being as 

 in fig. 64, with exciting and polarising circuits con- 

 joined as shown, so that both these currents pass into 

 the nerve by the same pair of electrodes. 



Fig. 64. 



I first make the polarising current, which provokes 

 an anodic extrapolar current to the right in the nerve 

 and in the galvanometer ; now that the deflection is 

 steady I excite the nerve, and during the excitation 

 the spot moves to the left, indicating a diminution of 

 the extrapolar anodic current. 



How shall we best interpret these facts. Let us 

 first formulate them in terms of the usual signs + and 

 — , positive and negative. During polarisation /' is 



