ANIMAL ELECTRICITY. LECTURE IV. 93 



Experiment. — The original or polarising current 

 [fig. 39] is from A to K. In consequence of electrolysis 

 at the surfaces of entrance and exit between liquid 

 sheath and metal core, counter-current is aroused, acting 

 as a resistance, causing the surfaces of entrance and exit 

 to spread along the model. In the figure you must 

 imagine that the anodic or electropositive state shades 

 off to the left from a maximum to a minimum value, so 

 that if you connect a galvanometer with extrapolar 

 points I and 2, then 2 and 3, then 3 and 4, you will 



b^ 



r%) 



EiG. 40. — " Katelectrotonic " current from a core model. 



get three diminishing values for current in the gal- 

 vanometer from I to 2, 2 to 3, 3 to 4 (in the wire core 

 from 2 to I, 3 to 2, 4 to 3). 



Precisely similar effects would be observed on 

 connecting the galvanometer with a series of points 

 on the side of the kathode to the right of the polar- 

 ising current in ^g. 40. But it will obviously be 

 simpler to reverse the poles of the polarising battery, 

 giving all currents with arrows pointing to the left 

 instead of to the right. 



