upon the Electrotonic Currents of Medalled ed Nerve. 83 



In the earlier observations series of anelectro tonic and of katelec- 

 trotonic currents were separately recorded. In the later observa- 

 tions the A and K currents were taken at alternate minutes by 

 means of a rotating reverser in the polarising circuit. In the 

 finished records A currents read upwards, and K currents read 

 downwards. 



Results. — The characteristic results of acid and base upon the 

 anodic and kathodic currents respectively are summarised in the 

 following four observations (Plates 2360, 2412, 2429, 2432). 



Fig. 6.— Action of C0 2 on A and K (2429). 



Fig. 7. — Action of ammonia vapour on A and K (2432). 



They illustrate the rale that : 



Acidification diminishes the quotient A/K. 

 Basification increases the quotient A/K. 



A diminution of the quotient A/K may be by diminution of A or 

 by increase of K. In plate 2412 it is mainly by diminution of A. 

 In this case the augmentation of K is comparatively small. The 

 record in fact approaches towards the type of plate 2359. In other 



VOL. LXII. h 



