20 



procuring the agent's cash price through coiTespondence, and in 

 most cases the prices pubHshed have been verified over the agent's 

 signature. The percentage difference is pubHshed in each case to 

 conform to the law. Its significance has been so often discussed 

 in previous bulletins that it seems unnecessary to enlarge upon it at 

 this time. It simply represents in percentages the excess of the 

 average retail cash price over the commercial value in raw materials 

 of the plant food in the fertilizer. 



Unmixed Fertilizing ]\1aterial. 

 Thirty-three samples of ground bone have been 

 Ground collected and analyzed. Ten were foiind de- 



Bone, ficient in phosphoric acid and five in nitrogen. 



The average retail cash price for ground bone has 

 been $31.32 per ton, the average valuation .$29.80 and the percent- 

 age difference 5.10, Two of the brands analyzed showed a commer- 

 cial shortage of 50 cents or over per ton: 



Buffalo Fertilizer Co., Bone Meal No. 859. Nitrogen fotmd 

 2.47%, guaranteed 2.9%; total phosphoric acid found 22.96%, 

 guaranteed 22%. 



Geo. E. Marsh & Co., Marsh's Pure Bone Meal, No. 333-368. 

 Nitrogen foimd 2.68%, guaranteed 2.48%; total phosphoric acid 

 found 26.12%, guaranteed 28%. 



Eighteen samples of tankage have been analyzed ; 

 Ground three were found deficient in nitrogen and five in 



Tankage. phosphoric acid. The average retail cash price 

 per ton was $34.14, the average valuation per ton 

 $32.69 and the percentage difference 4.43. Nitrogen in fine tank- 

 age has cost on the average 20.89 cents; nitrogen in coarse tank- 

 age has cost 15.65 cents per pound. Three samples have shown 

 a commercial shortage of over 50 cents per ton. They are as fol- 

 lows: 



Bowker Fertilizer Co., Ground Tankage No. 220-807. Nitrogen 

 found 5.12%, guaranteed 4.94%; total phosphoric acid foimd 

 11.45%, guaranteed 13.73%o- 



Coe-Mortimer Co., Tankage No. 249. Nitrogen fotmd Z.lb%, 

 guaranteed 4.96%; total phosphoric acid found 13.29%, guaran- 

 teed 13.70%. 



Another sample said by the Coe-Mortimer Co. to be from the 

 same lot, was shipped to the Agricultural Department of the Ex- 

 periment Station; this sample tested 5.13% nitrogen and 14.40% 

 phosphoric acid. 



Springfield Rendering Co., Ground Tankage No. 974-1028. 

 Nitrogen found 7.03%, guaranteed 7.40%; total phosphoric acid 

 found 11.46%, guaranteed 12%. 



