
320 : _ Report oF THE CHEMIST OF THE 
The time required for the rennet to completely coagulate the 
milk varied, in all the work, from three to forty minutes. The 
time required for coagulation depended maiaty upon two condi- 
tions — (1) the amount of rennet extract used, and (2) the degree 
of “ripeness” or acidity of the milk. The range of temperature 
employed was probably not such as to affect noticeably the 
average time of coagulation. The time was more uniform in 
the factory experiments, because larger amounts of milk were used 
and the amount of rennet used was more uniform. In the July 
station experiments tainted milk was used. There is much 
special study needed in connection with the conditions under — 
which rennet-extract coagulates milk. 

