1856 Wiedemann] ABSTRACT I7 



acid; the middle portion was tested for acid and cadmium. 

 This apparatus (iv) was made in four sizes for solutions of dif- 

 ferent concentrations; the smallest anode vessel contained 12 

 C.C., the largest 238 c.c. ; Pt cathode, Cd anode. 



In the second column are given the number of g water in 

 which one g of salt are dissolved. 



1856. G. Wiedemann. 



Ueber die Bevvegung der Flussigkeiten im Kreise der geschlossenen galvan- 

 ischen Saule und ihre Beziehungen zur Elektroljse. Pogg. Ann., 99, 177. 



Apparatus: two glass jars connected by a wavy siphon, 

 capacity 200 c.c. ; Pt electrodes; no diaphragms ; no middle 

 portion. Blank experiments showed the existence of an un- 

 changed middle portion in the cases of sodium sulphate and 

 potassium iodide. 



Hittorf, Pogg. Ann., 103^ 8, shows that the results are incor- 

 rectly calculated. In the electrolyses of the copper salts between 

 Pt electrodes, the acid formed at the anode reached the cathode 

 portion, and Wiedemann points out that the current was partly 

 carried by free acid. 



A further series of determinations were made using porous 

 earthenware diaphragms, repeating the experiments with sul- 



Proc. Wash. Acad. Sci., June, 1907. 



