26 



In the present bulletin the organic nitrogen has been reported 

 as in previous years: — (a) Water soluble organic nitrogen^ (b) active 

 water insoluble organic nitrogen^ (c) inactive water insoluble organic 

 nitrogen. From information furnished by the tables of analyses it 

 is believed that anyone will be able to readily detect cases where in- 

 ferior forms of organic nitrogen have been used. It might be added 

 that cases should be viewed with suspicion which show collectively 

 the follovv'ing characteristics : 



(a) The inactive water insoluble organic nitrogen equal or 

 exceeding the active zvater insoluble organic nitrogen, except in cases of 

 high grade tobacco fertilizers having most of their organic nitrogen de- 

 rived from cottonseed meal or castor pomace. 



(b) The total nitrogen found but little in excess of the minimum 

 guarantee. 



(c) The presence of only small amounts of water soluble organic 

 nitrogen. 



The following summary table shows the average amount found 

 and the quality of nitrogen used by each manufacturer in the brands 

 sold during 1914: 



