32 



The results of a study of the different forms of nitrogen have 

 been presented somewhat differently than in the past, the object 

 being greater simplicity and ease of interpretation, and also to con- 

 form to a uniform system adopted by the New England States, 

 New York and New Jersey. 



The percentages of nitrogen in form of nitrates and ammoniates, 

 as well as the water soluble organic nitrogen and the total nitrogen, 

 are given as in former publications. In place of publishing the actual 

 percentages of active water insoluble and inactive water insoluble 

 organic nitrogen, a column is introduced which gives the total water 

 insoluble organic nitrogen, also a column adjoining, which gives an 

 idea of the quality of this form of nitrogen by the use of the words 

 "passed'^ and "inferior^\ Any brand that is marked "passed"^ 

 carries its water insoluble nitrogen in a satisfactory form. In other 

 words, it shows an activity by laboratory methods that would class 

 it above the so-called low grade organic ammoniates. On the other 

 hand, any brand marked "inferior'' has shown by the laboratory 

 test a low activity, and would indicate the use of inferior forms of 

 organic ammoniates. All of the brands with the nitrogen marked 

 "inferior'' have been grouped in a separate table, and the actual per- 

 centages of active and inactive water insoluble nitrogen are given. 

 (See pages 27 and 28.) 



In place of the usual column giving comparative valuations^ 

 there has been substituted a column headed "Guarantee Substantially 

 Met(?)." In those brands which do not show a commercial short- 

 age, — that is, where the guarantee is substantially met, — the word 

 *'Yes" has been used. In those brands where a commercial shortage 

 exists, the word "No" will appear. This simple arrangement will 

 enable the reader at a glance to detect those brands which show 

 serious deficiencies. 



The arrangement of the remainder of the table, which includes 

 the different forms of phosphoric acid and potash, is the same as in 

 preceding years, and is self-explanatory. 



