JACQUES LOEB 



265 



similar result. These experiments do not support the hypothesis 

 that the drop in the curves for viscosity, swelling, and osmotic pres- 

 sure of gelatin-acid salts at or near pH 3.3 is due to a corresponding 

 drop in the degree of ionization of the gelatin salts mentioned. 



No drop was discovered in the conductivity curves for metal gelat- 

 inates (Na gelatinate, Fig. 8, and Ba gelatinate, Fig. 9). 



TO 



65 



pH 



1.8 2.0 22 24 2.6 2S aO 



Fig. 7. 



The question now arises whether we can explain the difference in 

 the sweUing, osmotic pressure, and viscosity of gelatin sulfate on the 

 one hand and gelatin chloride and oxalate, etc., on the other hand on 

 the basis of the ionization theory. If the ionization theory is correct 

 the conductivity of gelatin oxalate, and of gelatin chloride should be 

 twice or almost two and one-half times as great as that of gelatin 

 sulfate. Yet Table' VI shows that there is very little difference 



