JACQUES LOEB 



493 



A glance at the curves for conductivity shows that those for Na, 

 Li, Ba, and Ca are almost identical, while the curves for K and NH4 

 are a little higher than the others. These experiments were repeated 

 and the same values were obtained. Fig. 8 shows that while the 

 curves for conductivity of gelatin salts with univalent and bivalent 

 metals (Na and Ba) are almost identical, the curves for the osmotic 

 pressure of the two types of salts are very different. 



325 



300 



275 



250 



225 



200 



175 



150 



125 



100 



75 



50 



25 







3 



2 



I 





 pH 4.8 5.1 5.4 57 6.0 6.3 6.6 69 72 75 78 8.1 84 8.7 9.0 



oBa(0H)2 eNaOH 



Fig. 8. Showing that while the curves for conductivity of sodium and barium 

 gelatinate are practically identical, the curves for the osmotic pressures are very 

 different. 



There are two possible explanations for the fact that the ratio of 

 conductivities of the two types of salts (Ca gelatinate and Na gelat- 

 inate) is 1 : 1 while the ratio of osmotic pressures is 1 : 3. The one ex- 

 planation is that the degree of electrolytic dissociation of Ca gelat- 

 inate is so much smaller than that of Na gelatinate as to produce a 



