386 



Dr. R. A. Lehfelclt on Electromotive 



by the method described below, and found negative results 

 as shown in the following table. Cells of the type 



Zn : ZnS0 4 : Hg 2 S0 4 : Hg 



were set up with (a) amalgamated zinc rods, (/3) zinc 

 amalgam containing less than 1 per cent, of zinc, and their 

 differences taken. 



Concentration of ZnS0 4 

 (gm.-eqniv./litre.) 



3^3 



3 



V3 

 1 



i 



i 



E.M.F. in volt 



(«)-(/3). 



0-0061 

 64 

 54 

 69 



77 

 65 



It will be seen that the irregularities observed are merley 

 errors of experiment, and give no support to Wright and 

 Thomson's opinion. 



The previous experiments, reduced, are as follows : — 



Zinc Chloride. 

 Concentration-cells with migration. 



Moser's observations. 



I 



Gms. ZnCL, 



to 

 100 g. water. 



E.M.F. 



in 



D an i ells. 



gm.-equiv. /litre. 

 1000 C. 



logO 

 = .-*• 



E.M.F. from 

 normal soln. 

 Volts X 10-4. 





1 





04480 



4-17042 



- 351 





3 



00181 



0-4389 



4-64241 



156 





5 



269 



0-7306 



4-86367 



60 



' 



10 



390 



1-449 



3-16092 



+ 70 



Daniell taken as 



15 



470 



2-149 



3-33219 



157 



1-08 volt. By 



20 



525 



2-833 



3-45218 



216 



interpolation nor- 



25 



587 



3-493 



354311 



283 



mal solution lies 



50 



832 



6554 



3 81650 



547 



0-0060 volt above 



75 



1100 



9-213 



396442 



837 



5°/o solution. 



100 



1347 



11-52 



2~06145 



1104 





125 



1626 



13-60 



2" 13345 



1405 





150 



1932 



15-37 



2-18667 



1735 





