176 MASS. EXPERIMENT STATION BULLETIN 167. 





/SO 

 /¥o 



/CO 



9(? 

 60 

 7C 

 6c 



IV(7 



■\ 



G-ra-phic T?CPreseT)tation (3) 



y 



/^rcfeoly&/s 



/-/-/ 



/yz 



^..'MC7-'^:^^i> 



'Or'W-"-'0 



(Ff'Ifrafe) 





Z^C /V^^^-s 



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 Pii = 8.10, while Ph in the control and flask 2 increased verj'- 

 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 shght. 



