176 MASS. EXPERIMENT STATION BULLETIN 167. 



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Table XII. and Graph 3 indicate the following: — 



1. Ph in flask 1 increased toward the optimum Ph or, changed from 

 Ph = 7.11 to Ph = 8.10, while Ph in the control and flask 2 increased very 

 slightly. 



2. The amount of formol titrating nitrogen in flask 1 increased from 

 49 to 146 milligrams, while in the others the increase was very slight. 



