54 a EXPERIMENT STATION. [Jan. 



(a) Fertilizers registered. 

 During the season of 1915, 112 manufacturers, importers and 

 dealers have secured certificates for the sale of 501 different 

 brands of fertilizer, agricultural chemicals, raw products and 

 agricultural limes, classed as follows: — 



Complete fertilizers, 345 



Fertilizers furnishing phosphoric acid and potash, .... 9 

 Ground bone, tankage and dry ground fish, . . . . , .51 



Chemical and organic nitrogen compounds, 67 



Agricultural limes, 29 



501 



(6) Fertilizers collected and analyzed. 



During the year 6,914 tons of fertilizer were sampled, neces- 

 sitating the sampling from 16,709 different sacks. Of the com- 

 plete fertilizers, 60 per cent, of the total tonnage were high- 

 grade fertilizers (valued over $24 per ton), 31 per cent, were 

 medium-grade (valued between $18 and $24 per ton), and 9 per 

 cent, were low-grade (valued less than $18 per ton). 



In this work 150 towns were visited and 1,322 samples, rep- 

 resenting 513 distinct brands, were drawn from stock found in 

 possession of 353 different agents. 



Seven hundred and twenty-one analyses (505 distinct brands) 

 have been made during the year's inspection, as follows: — 



Complete fertilizers, 373 



Fertilizers furnishing phosphoric acid and potash, . . ... 20 



Ground bone, tankage and dry ground fish, 61 



Nitrogen compounds, 190 



Potash compounds, 7 



Phosphoric acid compounds, 34 



Lime compounds, 36 



721 



Full details regarding the fertilizer inspection work will be 

 found in Bulletin 4, Control Series, published in December, 

 1915. 



In addition to its inspection work this section does consider- 

 able work in the analysis of substances sent by different depart- 



