108 EXPERIMENT STATION. [Jan. 



age retail cash price has been $30.25, and the average commer- 

 cial valuation as calculated bj the table of trade values has been 

 $23.27 per ton. Dissolved bone has averaged 2.60 per cent, 

 nitrogen, Tl.16 per cent, of which has been found active by the 

 alkaline permanganate method. 



Thirteen analyses of dry ground fish have been made, rep- 

 resenting 32 samples. The average retail cash price per ton 

 has been $42.16 and the average calculated commercial valua- 

 tion $41.59 per ton. Xitrogen from dry ground fish has cost 

 on the average 22.3 cents per pound. 



(1) Materials furnisliing Nitrogen. — Eight samples of 

 dried blood have been examined, representing 6 analyses. 

 Blood has averaged 10.46 per cent, total nitrogen, about 74 

 per cent, of which has been found active by the alkaline per- 

 manganate method. The average retail cash price for blood 

 has been $50.74 per ton, and the average calculated commercial 

 valuation, $48.26 per ton. The average pound cost of nitrogen 

 from blood has been 23.13 cents. 



Two samples of castor pomace have been analyzed, both of 

 which have been found up to the guarantee. The average retail 

 cash price has been $25.50, and the average commercial valua- 

 tion calculated by the table of trade values has been $19.24 per 

 ton. The average cost of nitrogen in this form has been 26.51 

 cents per pound. Castor pomace has shown on the average 4.81 

 per cent, nitrogen, about 54 per cent, of which has been found 

 active by the alkaline permanganate method. 



Fifty-six samples of cottonseed meal have been examined. 

 Each sample represents a carload, and all of the material in- 

 spected was bought as a nitrogen source, largely for tobacco. 

 The average retail cash price has been $31.45, and the average 

 calculated commercial valuation, $25.95 per ton. The average 

 pound cost of nitrogen in this form has been 24.24 cents. Cot- 

 tonseed meal has averaged 6.49 per cent, nitrogen, about 56 per 

 cent, of which has been found active by the alkaline permanga- 

 nate method. 



Thirty-nine samples of nitrate of soda have been examined, 

 representing 16 analyses: all l)ut one sample was found fully 

 up to the guarantee. Nitrate of soda has cost on the average 



