16 



Twenty-four samples of tankage have been in- 

 Ground Tankage, spected, necessitating 17 analyses. They were 



found well up in phosphoric acid and only three 

 of the samples were found deficient in nitrogen. The average retail 

 cash price for tankage has been $33.19 and the average calculated 

 commercial valuation $36.27 per ton. The average total nitrogen 

 in tankage was 6.35 per cent, of which 75.75 per cent has been found 

 active. Nitrogen in fine tankage has cost on the avergae 19.68 cents; 

 nitrogen in coarse tankage has cost 16.01 cents per pound. No com- 

 mercial shortages of fifty cents per ton were noted. 



Four analyses of dissolved bone have been made 

 Dissolved Bone. and the guarantees were found well maintained. 



The average retail cash price has been $28.00 and 

 the average calculated commercial valuation $26.70 per ton. The 

 average per cent of nitrogen in this product was 3.34, 76.35 per cent 

 of which was found in active form. 



Thirty-nine samples of dry ground fish were in- 

 Dry Ground Fish, spected, necessitating 16 analyses. Three were 



found deficient in nitrogen and 2 in phosphoric 

 acid. The average retail cash price has been $47.56 and the average 

 calculated commercial valuation $41.92 per ton. The product has 

 averaged 8.01 per cent total nitrogen, about 73.00 per cent of which 

 has been found active. Nitrogen from fish has cost on the average 

 25.5 cents per pound. No commercial shortages of fifty cents per 

 ton were noted. 



Eight analyses of dried blood have been made. 

 Dried Blood. Three were found deficient in nitrogen. In two 



cases the nitrogen deficiency was made up by 

 phosphoric acid so that only one commercial shortage of over fifty 

 cents per ton was noted. The average per cent of nitrogen found in 

 dried blood was 10.43, 76.61 per cent of which was found active by 

 laboratory methods. The average per cent of phosphoric acid 

 in dried blood was 3.91, the highest amount found being 7.36 

 per cent. The average retail cash price for blood has been $47.33 

 and the average calculated commercial valuation $49.93 per ton. The 

 average pound cost of nitrogen from this source has been 22.69 cents. 

 One sample of dried blood showed a commercial shortage of over 

 fifty cents per ton. 



Nitrate Agencies Co., No. 534. Nitrogen found 10.60%, guar- 

 anteed 13.16%. 



Only one sample of castor pomace was analyzed. 

 Castor Pomace. The nitrogen guarantee was well maintained. 



The cash price per ton was $25.00; the average 

 calculated commercial valuation $23.63. The cost of nitrogen, there- 

 fore, based upon the single cash price furnished was 23.8 cents per 



