106 



OSMOTIC PRESSURE AND VISCOSITY 



TABLE I. 



pH of gelatin in 

 suspension . . . . 



pH of gelatin in 

 solution 



5.12 

 4.98 



4.60 

 4.35 



4.49 

 4.12 



4.18 

 3.91 



4.07 

 3.69 



3.73 

 3.50 



3.45 

 3.14 



2.93 



2.78 



2.68J2.34 

 2.502.28 



2.09 

 1.97 



1.86 

 1.86 



1.77 

 1.72 



1.53 

 1.57 



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



Time in minates 



Fig. 6. Influence of temperature on the variation of viscosity of gelatin solu- 

 tions on standing. Below 35°C. the viscosity of a 2 per cent gelatin chloride 

 solution of pH 2.7 no longer increases but diminishes on standing. 



