New York Agricultural Experiment Station. 199 



Table III. — Showing the Action of Rennet-Extracts of Different 

 Ages on ]\Iilk-Casein. 



The data embodied in Table III appear to be quite definite in 

 respect to the following points: 



(i) At any given time, the fresh rennet-extract had, in most 

 cases, formed a larger amount of soluble nitrogen compounds 

 than had the old extract. This was particularly true in acid 

 solution. This result does not indicate that we had bacterial 

 enzymes in the old rennet in addition tO' rennet-enzyme. The 

 difiference in action of the two rennet-extracts is not marked in 

 the class of amido' compounds. If the old extract contained 

 bacterial enzymes, we should expect it to produce larger amounts 

 of amido compounds. These results fail to show that the old 



