17 



Seven samples of dried blood have been analyzed 

 Dried Blood. and found to be well up to the guarantee. The 



average per cent of nitrogen found in this product 

 was 10.22, 77.20 per cent of which was found active by the laboratory 

 method. The average per cent of phosphoric acid in dried blood 

 was (5.55, the highest amount found being <S.ll per cent. The average 

 retail cash price for blood has been $48.10, and the average calculated 

 commercial valuation $49.57 per ton. The average pound cost of 

 nitrogen from this source has been 23.53 cents. 



Six samples of castor pomace were analyzed, the 

 Castor Pomace. nitrogen guarantee being well maintained. The 



cash price per ton of this material was $25.40, 

 the average calculated commercial valuation $20.30. The cost of 

 nitrogen in castor pomace was 25 cents per pound. The average 

 per cent of nitrogen was found to be 5.08, of which 57.7 per cent was 

 found active by the laborator^^ method. 



One hundred and forty-eight samples of cotton- 

 Cottonseed Meal, seed meal have been examined. These represent 



carload lots in all cases. They were largely taken 

 by our collectors upon call from the purchaser. The material is 

 bought by the local farmers in the Connecticut Valley as a nitrogen 

 source for tobacco. There has been a tendency among the dealers 

 in cottonseed meal to place a nitrogen guarantee much in excess of 

 what the meal will actually test. This has resulted in a great many 

 nitrogen deficiencies. Arrangements were made, however, with the 

 purchaser so that if analysis showed a deficiency a proper rebate 

 would be in order. It is felt that this practice of placing a high guar- 

 antee on the meal is not to be encouraged, it being much fairer to 

 put a guarantee of nitrogen upon the article which can be readily 

 maintained. Dealers will please note that the buyers of cottonseed 

 meal desire the grade purchased and not rebates. Altho rebates 

 may offer a satisfactory adjustment of deficiencies, they do not in 

 any way affect the right of the station official to take such action as 

 may seem advisable when such deficiencies are plainly due to mis- 

 representation or carelessness. The average retail cash price for 

 cottonseed meal has been $31.26, and the average calculated com- 

 mercial valuation, based on the nitrogen content alone, has been 

 $26.47 a ton. The average pound cost of nitrogen has been 23.57 

 cents. The average per cent of nitrogen in cottonseed meal has been 

 6.63. The nitrogen in cottonseed meal shows an activity of 56 per 

 cent by the laborator}^ methods, and about 69 per cent by pot ex- 

 periments carried out at this station. Seventy samples have shown 

 a nitrogen deficiency. The following brands have shown a commer- 

 cial shortage of over 50 cents a ton. In calculating this commer- 

 cial shortage the value of the potash and phosphoric acid has not 



