388 Dr. C. B. RadclifFe's Researches in Animal Electricity. [Apr. 8, 



plied on each side to the portion of nerve beyond the pole. Then, 

 having waited until the salt has set up a state of tetanus in both limbs, 

 the voltaic circuit is closed and opened in turn, with the poles first in one 

 position and then in the other. On closing the circuit, anelectrotonus is 

 set up on the side of the positive pole, cathelectrotonus on the side of the 

 negative pole ; and what has to be done is to notice the behaviour of the 

 limb before, during, and after the setting up of these states. In this expe- 

 riment are four steps, of which the particulars may be tabulated thus : — 



Step 1. Poles arranged so as to cause cathelectrotonus in limb A, an- 

 electrotonus in limb B. 



Fig. 5. 



Cathelectrotonus 

 on the side of 

 limb A. 



Action of salt, 

 causing in 

 limb A 



Anelectrotonus 

 on the side of 

 limb B. 



Action of salt, 

 causing in 

 limb B 



Before. 



Tetanus. 



Before. 



Tetanus. 



During. 



0. 



During. 



0. 



After. 



Momentary 

 contraction. 



After. 



Tetanus. 



Step 2. Poles transposed so as to cause anelectrotonus in limb A, cath- 

 electrotonus in limb B. 



Limb A+ —Limb B 



Anelectrotonus 



after 

 Cathelectrotonus 

 on the side of 

 limb A. 



Action of salt, 

 causing in 

 limb A 



Cathelectrotonus 



after 

 Anelectrotonus 

 on the side of 

 limb B. 



Action of salt, 

 causing in 

 limb B 



During. 



Rest at first, 

 then twitchings, 

 progressively in- 

 creasing in fre- 

 quency and force 



During. 



Semi-tetanus 

 at first, 

 then rest. 



After. 



Tetanus. 



After. 



Momentary 

 contraction. 



