JOHN H. NORTHROP 



495 



TABLE IV. 



Viscosity and Rate of Digestion. 



2 per cent gelatin, pH 6.0, specific conductivity 1 X 10~^ (adjusted with NaCl) 

 was heated to 50°C. and cooled rapidly to 25°C. Viscosity was determined at 

 intervals at 25 C. and rate of digestion determined by adding 1 cc. of trypsin to 

 25 cc. gelatin and following change in conductivity. Increase in formol titration 

 after 1 hr. was also determined. 



TABLE V. 



Comparison of Observed and Calculated Results with Varying Gelatin and Trypsin 



Concentrations. 



* Calculated from formula C 

 given at the head of the table. 



E S 

 K' + 5 



, K' = 0.5. The values for E are 



