106 Messrs. Wright and Thompson on the Determination of 
from cuprous chloride by cadmium =96250 — 65750 = 30500). 
On setting up a number of such cells the following values 
were obtained, the averages being sensibly identical with 
those thus calculated :— | 
| CuCl, suspended in | Cu,Cl, suspended in 
zine chloride. cadmium chloride. 
Maximum H.M.F....... 667 "674 
Mamata. % fa fees | 654 666 
Average eB cha aber 659 | 671 
Probable error ......... +:0027 +:0016 
It is noticeable in connection with these values, that whereas 
zinc-cadmium, cadmium-copper, and zinc-copper cells set up 
with sulphate solutions of various strengths possess H.M.F’s. 
in no case differing by more than +°010 volt from the values 
calculated from the difference between the heats of formation 
of the two electrolytes, the divergence between the two values 
is usually much greater when corresponding cells are set up 
with chloride solutions. Thus, for example :— 
Calculated. Observed. | Difference. 
Zinc-Cadmium (25MCl, 100H,O) .... “866 880 — -036 
Do.  (6-0MCI, 100H,0)...... ‘251 | 296 +045 
Zinc-Copper (Cu, Cl, in ZnCl,) ......0.. 10388 988 —-050 
Do.  (Cu,Cl, in CdCl) ......... 1038 | 1-001 —-037 
Do. (Qu, Cl, in CuCl,) ......... 1038 | 1099 +061 
| Cadmium-Copper (Cu, Ol, in ZnCl,)...| 672-659 —013 
| Do. (Ou,Ol, in CdOL,)..4) — “672 = ey —001 
Do. (Cu,Cl, in CuCl,)...| 672 | -769 | +097 
| 
ITI. Silver. 
182. A number of cells were set up with anialgamated-zine 
and zinc-chloride solution on one side, and on the other side 
electro-silver immersed in a magma of freshly precipitated, 
well-washed silver chloride,suspended in zinc-chloride solution. 
The following values were finally obtained for cells where the 
zinc-chloride solution is of the same strength, mZnC], 100 H,0, 
