124 



LECTURES ON IMMUNITY 



The constants, KP, are respectively 10 and 3. For short 

 times the digested quantity is proportional to the square root 

 of the time, so that if as well time, t, as quantity,/ of steapsin 

 change, the digested quantity is proportional to the square- 

 root of the product of f- 1. Even this rule has been verified 

 by Stade. Stade's work has been repeated by Engel 1 for 

 the glycerine extract of " pancreatin Rhenania " as well as 

 for gastric juice, acting on an emulsion of egg-yolk. The 

 following figures reproduce two series of observations, the 

 one at 30, the other at 40 with 1.24 times as much extract 

 of pancreatin. The time of digestion was 6 and 18 hours 

 respectively. From these observations we may calculate 

 the variation of K with temperature. We so find /JL = 

 15,600. 



Stade has furnished some measurements on the in- 

 fluence of the concentration (c) of gastric juice at 40 

 C. on this process, which we reproduce below. The tabu- 

 lated figures concern the hydrolysed quantity in per cent 



1 Engel: Hofmeisters Beitrage, 7- 77 (1905), 



