ods. The percentage activity of the total nitrogen was 83%; of 

 the total organic 72%, and of the water insoluble organic 57%. The 

 brands containing inferior forms of nitrogen will be found on a fol- 

 lowing page. 



Brands Shozving Inferior Forms of Nitrogen. Sixteen out of 

 a total of 226 brands of complete fertilizers, and 2 out of a total 

 of 127 brands of ammoniated superphosphates, besides 1 sample 

 of a sewerage product, 1 sample composed largely of soot, and 2 sam- 

 ples of partially dried peat or "humus", were found to contain organic 

 nitrogen of questionable quality, and are so listed in the tables of 

 analysis. The quality of the water insoluble nitrogen in these 

 brands has been studied by both the alkaline and the neutral per- 

 manganate methods, and the table which follows gives in detail the 

 results obtained. It should be borne in mind, in interpreting the 

 results, that in case of the alkaline method, anything falling below 

 50, and in the neutral method anything falling below 85, should be 

 classed as inferior. The originator of the neutral method (Mr. Street) 

 states that he would view with suspicion anything falling apprecia- 

 bly below 90. 



A number of pulverized manures have been included in the table. 

 It is a well known fact that the water insoluble portion of the nitro- 

 gen in this class of materials is slow in action. This does not mean 

 that this nitrogen is without distinct fertilizing value. It does mean, 

 hov/ever, that relatively speaking, it is less valuable than the better 

 grades of organic nitrogen usually employed in commercial fertilizers. 

 They were included, however, for comparison; also because they are 

 registered products and appear in the tables of analyses. 



