1910-11.] Temperature Coefficient of Concentration Cells. 391 
The result is to show that instead of the saturated solutions giving no 
E.M.F., the equilibrium of no E.M.F. is not reached till the water has 
been diluted to about two molecules per 1000 cc. This represents very 
nearly the mean of the results obtained. 
As has already been pointed out, in the case of alcohol, the diffusion 
/ 2 3 4 5 6 7 
Gramme molecules of potassium iodide in 1000 cc. 
results in evolution of heat and precipitation of the dissolved salt. It 
seemed therefore advisable to investigate the conditions of this precipita- 
tion, and determine whether there was a particular strength of water 
solution which would not be precipitated by the addition of a large excess 
of alcohol already saturated with KI. 
To test this a series of glass tubes were filled with alcohol saturated with 
