Curve showing the precipitation of potassium iodide from water by alcohol saturated with the salt. 
1910-11.] Temperature Coefficient of Concentration Cells. 393 
equilibrium and gives no E.M.F. Moreover, if both solutions are diluted, 
the conditions of zero E.M.F. are a ratio nearly corresponding to this, so 
that the partition coefficient ratio must be defined, when the liquids inter- 
diffuse and the one precipitates the salt in the other, as the ratio between 
Number of cc. of alcohol saturated with KI added to 1 cc. of water. 
