612 



COLLOIDAL BEHAVIOR OF EDESTIN 



Loeb on gelatin. The true explanation of the effect of salts on these 

 properties of protein solutions is found in Donnan's theory of mem- 

 brane equilibrium. 



40 



20 

 



2048 1024 512 256 128 64 32 



Concentration of salt, ecj^uivalents per liter 



Fig. 7. Effect of different chlorides on osmotic pressure observed with 0.45 

 per cent edestin chloride at pH 3. 



In studying the effect of hydrogen ion concentration on the osmotic 

 pressure of gelatin chloride, Loeb^ found that the curves obtained 

 were of the same general shape as the p.d. curves, but that the maxi- 

 mum for osmotic pressure was at a slightly lower pH. He later^" 



