ANIMAL ELl^XTRICITV. — LECTURE IV. 95 



the anodic surfaces will be made visible to us by their 

 acidic character. In the experiment illustrated by 

 %. 41, the battery electrodes (of platinum) are 

 at I and 4, the electrodes between fluid sheath and 

 platinum core are at 2 and 3. Taken in order we 

 have anode to fluid at i, kathode from fluid at 2, 

 anode to fluid at 3, kathode from fluid at 4. The 

 fluid is a mixture of dextrine and potassium iodide, 

 soon after closure of the battery current the effect of 

 anodic electrolysis is apparent as a reddening at the 

 two surfaces 1 and 3, and you will not fail to remark 





— 2 



4 - ___7- -V^ 



iii l ili l iii l lliilliliilli l iiiii i im 



Fig. 41. — Experiment illustrating the entrance and exit of current to and from 

 the sheath and axis of a core-model. The current in the direction i, 2, 3, 4, 

 enters the fluid at i and 3, leaves the fluid at 2 and 4, i and 3 are thus "anodic," 

 2 and 4 are " kathodic " as regards the fluid. 



that at the latter of these the effect is most pro- 

 nounced immediately under the battery kathode, but 

 shades off in diminishing degree to a considerable 

 distance along the wire in an extrapolar direction. 



The core-model used in the experiment of p. 92, 



