34 



G. Daikuhara. aud T. Imaseki. 



To observe the effect of the several organic manures upon denitrifica- 

 tion more clearly, a calculation was made by subtracting the yield of pot 

 XII from those of I, II and III, and from the yields of IV, V, VI. VII, those 

 of VIII, IX X and XI respectively with the following result : 



