JACQUES LOEB AND ROBERT F. LOEB 



209 



NaCl causes no change in the rate of solution of gelatin chloride 

 as long as the concentration of NaCl does not exceed 1 m. Above 

 this concentration it causes coagulation and the viscosity can no 

 longer be measured. Plence NaCl in concentrations up to 1 M should 



2.7 

 2.6 

 2,5 

 2.4 

 2.3 

 22 



Influence of NaCl on 

 the rise in viscosity of 

 17o gelatin chloride' 

 solution of pH 3.4 on 

 standing at 20° C. 



5 10 15 20 25 30 35 40 45 50 55 60 



Time in minutes 



Fig. 9. Showing that NaCl solutions up to a concentration of 1 m have no 

 effect on the increase in viscosity of gelatin chloride solution of pH 3.4 on stand- 

 ing at 20°C. 



not alter the rate of increase of viscosity of gelatin chloride solutions 

 on standing. Fig. 9 shows that this is correct. 



These experiments corroborate the idea that gelatin solutions 



