348 ANNUAL, REPORT OF THE Off. Doc. 



(2) the number of parts of nitrogen in crop and in drainage compared 

 with 100 parts in the manure. These last figures are given in black- 

 faced type. The figures in the last column give the amounts of ni- 

 trogen unaccounted for, the plus sign indicating a gain of nitrogen 

 and the minus sign a loss of nitrogen over that contained in the 

 manure. 



