JACQUES LOEB 



567 



We therefore are confronted with the same situation as in the case 

 of sodium'^gelatinate and calcium gelatinate, where we also found 

 practically equal conductivity combined with a ratio of osmotic pres- 

 sures_of 3 : 1 for the two metal gelatinates mentioned. In the latter 

 case we offered the tentative assumption that the Ca ion combines 



325 

 300 

 Z75 

 250 

 Z25 

 ZOQ 

 175 

 150 

 125 

 '00 



15 



50 



25 





 pH 2.3 Z5 2.7 29 3.1 3.3 3.5 3i7 3.9 4.1 4.3 45 47 



H£504 • 

 HBrO 



Fig. 2. Osmotic pressure curves for gelatin sulfate and gelatin bromide. 

 Abscissae represent pH; ordinates, osmotic pressure, showing that for the same 

 pH the osmotic pressure is higher when HBr than when H2SO4 is added to gelatin. 

 The maximal osmotic pressure for both acids is found at the same pH (about 3.5). 



with two gelatin anions, these two gelatin anions remaining together 

 in a single aggregate when electrolytic dissociation occurs. If the 

 compound Ca2 gelatin4 dissociates into two Ca ions and one aggregate 

 of four gelatin anions carrying four charges, the same number of 

 charges, namely eight, would be carried by the dissociation of four 



