32 Report of the Chemist of the 



(3) Available phosphoric acid. The 400 brands of complete 

 fertilizers contained available phosphoric acid varying in amount 

 from 0.83 to 19.68 per cent and averaging 8.44 per cent. The 

 average amount of available phosphoric acid found by the Station 

 analysis exceeded the average guaranteed amount by 0.81 per 

 cent, the guaranteed average being 7.63 per cent and the average 

 found being 8.44 per cent. 



In 326 brands of complete fertilizers, the amount of available 

 phosphoric acid found was above the amount guaranteed, the 

 excess varying from 0.01 to 10.68 per cent and averaging 1.14 

 per cent. 



In 74 brands, the available phosphoric acid was below the 

 guaranteed amount, the deficiency varying from 0.01 to 3.06 per 

 cent and averaging 0.58 per cent. In 49 cases the deficiency was 

 below 0.5 per cent. 



The amount of water-soluble phosphoric acid varied from to 

 12.47 per cent and averaged 4.97 per cent. 



(4) Potash. The complete fertilizers contained potash varying 

 in aimount from 0.08 to 15.58 per cent, and averaging 4.57 per 

 cent- The average amount of potash found by the Station, analy- 

 sis exceeded the average guaranteed amount by 0.27 per cent, 

 the guaranteed average being 4.30 per cent and the average found 

 being 4.57 per cent. 



In 297 brands of complete fertilizers, the amount of potash 

 found was above the guaranteed amount, the excess varying from 

 0.01 to 4.41 per cent and averaging 0.53 per cent. 



In 103 brands, the potash was below the guaranteed amount, 

 the deficiency varying from 0.01 to 8.32 per cent and averaging 

 0,47 per cent. In 85 of these cases, the deficiency was less than 

 0,5 iper cent. 



In 88 cases among the 400 brands of complete fertilizers the 

 potash was contained in the form of sulphate free from an excess 

 of chlorides. 



(5) The retail selling price of the complete fertilizers varied 

 from $15 to |60 a ton and averaged $28.92, The retail cost of 

 the separate ingredients unmixed varied from $1.80 to $34.25 

 and averaged $20.17, or $8.75 less than the selling price. 



