4 MAINE STATE COLLEGE 



Cts. per lb. 



Organic nitrogen in fine ground medium bone and tankage 15 



"• " medium bone and tanliage 12 



•• coarse bone and tankage 7 



" " '• hair, horn shavings and coarse fisli scraps •.. . 7 



Phosphoric acid soluble in water 6 



" "■ soluble in ammonium citrate 5i 



" "■ in fine bone and tankage 5h 



" "■ in fine medium bone and tankage 4^ 



'• " in medium bone and tankage 3 



" *■'• in coarse bone and tankage 2 



" " in fine ground fish, cotton-seed meal, linseed meal, 



castor pomace and wood ashes, insoluble (in am. 



cit.) in mixed fertilizers 2 



Potash as High Grade Sulphate, and in mixtures free from Muriate, 5 



" "Muriate 4h 



The organic nitrogen in superphosphates, special manures and 

 mixed fertilizers of a high grade is usually valued at the highest 

 figures laid down in the trade values of the fertilizing ingredients in 

 raw materials, namely, 18 1-2 cents per pound; it being assumed 

 that the organic nitrogen is derived from the best sources, viz., 

 animal matter, as meat, blood, bones, or other equally good forms, 

 and not from leather, shoddy hair, or any low-priced, inferior form 

 of vegetable matter, unless the contrary is ascertained. The 

 insoluble phosphoric acid is valued in this connection at two cents. 



The above trade values are the figures at which in the six 

 months preceding March, 1894, the respective ingredients could 

 be bought at retail for cash in our large markets, in the raw 

 materials, which are the regular source of supply. 



They also correspond to the average wholesale prices for the 

 six months ending March 1st, plus about 20 per cent, in case of 

 goods for which we have wholesale quotations. The valuations 

 obtained by use of the above figures will be found to agree fairly 

 with the retail prices at the large markets of standard raw 

 materials, such as : 



Sulphate of Ammonia, Dry Ground Fish, 



Nitrate of Soda, Azotin, 



Muriate of Potash, Ammonite, 



Sulphate of Potash, Castor Pomace, 



Dried Blood, Bone and Tankage, 



Dried Ground Meat, Plain Superphosphates. 



Below is given a simple rule for calculating the commercial 

 value of the several brands of fertilizers practically on the basis 



