Passage of Electricity through Liquids. 



287 



whether the electrolytical action of the battery itself might not 

 occasion these differences. Against such an assumption, how- 

 ever, is the fact that sometimes the positive and sometimes the 

 negative pole preponderates. 



The following experiments were for the purpose of ascertaining 

 whether, when an alcoholic solution of iodide of cadmium is 

 electrolyzed, greater differences would appear than in the earlier 

 experiments. 



To this end a glass trough 106 millims. long and 27*5 mil- 

 lims. broad was filled to a height of 23 millims. with a solution 

 which contained 1 part by weight of crystalhzed iodide of cad- 

 mium to 0-967 of absolute alcohol, and had a specific gravity of 

 1'432. The electrical current of a Grovels battery of 17 ele- 

 ments, which stood upon a cake of resin and was filled as de- 

 scribed io § 57, was passed into and out of the liquid by means 

 of amalgamated plates of cadmium which could be shifted par- 

 allel to the smaller sides of the trough. The free electricity of 

 the poles of the battery was determined in the manner above 

 described (§ 57), by means of a Kohlrausch-Delimann^s electro- 

 meter, but without a condenser, one pole being led to the earth, 

 the other connected with the electrometer. When the battery 

 was open or was closed by a column of liquid of the length /, 

 the quantity of accumulated electricity was determined, + e or 

 — e according as the positive or negative pole of the battery was 

 connected with the electrometer. In the following Table the 

 measurements are placed together. The notation is the same as 

 in § 57. The first column contains the time which elapsed be- 

 tween fixing the battery and making the corresponding obser- 

 vation. 





Electrometer. 



Time. 





















Mean. | 





I. 



+ ^. 



— e. 



















Observed. 



Calculated. 



3h. 



GO 



5-237 



-4-993 



5115 





>» 



160 millims. 



4-957 



-^5010 



4-983 



4-862 



6h. 



QO 



5-39 



-5-32 



5-355 







160 millims. 



5-04 



-5-07 



5-055 



5 091 



iih. 



CG 



5-29 



-5-17 



5-230 







160 millims. 



4-91 



-4-85 



4-880 



4-972 





GO 



5-27 



-5-24 



5-255 





R = 50 mercury units. 



Both poles had communicated nearly the same quantity of 

 electricity to the electrometer, whether the battery was open or 

 closed. 



