32 AGRICULTURAL EXPERIMENT STATION. 



For comparison, the trade values used in 1886 and in 1887 are 

 also given : 



Trade Values of Fertilizing Ingredients in Raw Materials and 

 Chemicals for 1888. 



1886. 18S7. 1888. 

 Cts. per lb. Cts. per lb. Cts. per lb. 



Nitrogen in ammonia salts 18^ 17h 17^ 



" in nitrates 18i 16 16 



Organic nitrogen in dried and fine ground fish, 17 17^ 16i 

 " in azotin, ammonite and dried 



and ground meat 17 16^ 16^ 



" in cotton seed, linseed meal 



and in castor pomace 17 17h 16^ 



" in dried and fine ground blood 16i 16^ 



" in fine ground bone 17 16 16i 



" In fine medium bone 15 14 13 



" in medium bone 13 12 10^ 



•' In coarse medium bone 11 8i 



" " horn shavings, 



" " hair and fish 



" " scrap 9 8 8 



Phosphoric acid, soluble in water 8 8 8 



" " " in ammonium citrate 



(commonly called 



'•reverted'-) 7h Ih Ih 



" " insoluble, in dry fine ground 



fish and in fine bone 7 7 7 



" " insoluble, in fine medium bone 6 6 6* 



" " " in medium bone 5 5 5 



" " " in coarse medium 



bone 4 4 



in coarse bone 3 3'' 



" " " in fine ground rocli 



phosphate 2 2 2 



Potash as high grade sulphate 5i 5i 54 



" kainite 4i H H 



" muriate A\ 4^ 4\ 



It is seen that the prices for 1888 are practicall}' the same as 

 those for 1887. 



These values are applied to the valuation of Superphosphates 

 and all mixed goods, as follows : 



It is assumed that the organic nitrogen of these goods has for its 

 source such materials as dried blood, ground fish, or nitrogenous 

 substances of equally good qualitj^, unless a special examination of 



