Denitrification of Soils. 91 



no more than 11 Ibs. of nitrogen and jet not less than 230 

 Ibs. had been added to it and the soil at the start contained 

 at least 3 Ibs. There had been set free therefore 



230 8 = 222 Ibs. of nitrogen. 



Nor was this all, -for so completely had all the carbonaceous 

 materials been oxidized that even the paper used had en- 

 tirely disappeared. 



How far these processes take place under field condi- 

 tions when farmyard manure is applied we have yet to 

 learn. 



