30 



VELOCITY OF REACTIONS 



Dried rennet is extremely slowly decomposed at 

 that temperature. At 158 C. the constant is K = 

 0-041. This circumstance recalls the "denaturation" 

 of egg-albumen at high temperatures, for which also 

 the presence of water is necessary. 



without Alkali 



FIG. 5. 



The enzymatic reaction which has been most 

 thoroughly investigated is that of invertase on cane- 

 sugar. The invertase was prepared from yeast-cells. 

 VICTOR HENRI determined (1902) the velocity of in- 

 version of sugar with this enzyme and observed that 

 it behaves in a manner quite different from a mono- 

 molecular reaction. This experiment was controlled 



