46 



VELOCITY OF REACTIONS 



Coagulation of Milk by Rennet, 36-55° C. 



The same rule is valid for the digestion of gelatine 

 by a substance produced by Bacillus pyocyaneus. 

 By its action the gelatine is liquefied. The time 

 of liquefaction t is inversely proportional to the 

 quantity q of pyocyaneus ferment used. The 

 figures given in the following table, borrowed 

 from Madsen and Walbum, give a proof of the 

 ^/-law. 



Digestion of Thymol-gelatine by Means of Pyocyaneus 



Culture at 34-5° C. 



The saponification of fats by the steapsin from 

 the pancreatic juice is another example of the 



