676 



DONNAN EQUILIBRIUM AND MEMBRANE POTENTIALS 



TABLE rV. 

 Depressing Effect of Na2S04 on P.D. at Equilibrium. 



TABLE V. 



Influence of Concentration of CaCh on pH Inside Minus pH Outside and on P.D. 



at Equilibrium. 



IV. Influence of Neutral Salts on the Potential Differences between 

 Solid Gelatin and Outside Solution. 



It is well known that the addition of neutral salt depresses the 

 swelling of solid gelatin chloride or of any gel with a pH different 

 from that of the isoelectric point. This is intelligible on the basis of 



