COMMERCIAL FERTILIZERS. 287 



CentB per 

 Pound. 



Phosphoric acid insoluble in dry fine ground fish, and in fine 



bone, 06 



Phosphoric acid insoluble in fine medium bone, . . . 05^ 



Phosphoric acid insoluble in medium i)one, .... 05 



Pliosphoric acid insoluble in coarse medium bone, . . . 04 J 



Piiosphoric acid insoluble in coarse bone, ..... 04 



Phosphoric acid insoluble in fine ground rock phosphate, . 02^ 



Potash in liigh grade sulphate, . . . . . . . 07J 



Potash in kainite, 04J 



Potash in muriate, 04J 



The above trade values are the figures at which on March 

 Ist, 1884, the respective ingredients could be bought at re- 

 tail, for cash, in our markets in the raw materials, which arc 

 the regular source of supply. They also correspond to the 

 average wholesale prices for the six months ending INIarch 

 first, plus about 20 per cent, in case of goods for which we 

 have wholesale quotations. The calculated values obtained 

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

 with the reasonable retail price in case of standard raw ma- 

 terials, such as Sulphate of Ammonia, Azotin, Nitrate of 

 Soda, Dry Ground Fish, Muriate of Potash, Cotton-seed 

 Meal, Sulphate of Potash, Castor Pomace, Dried Blood, 

 Bone, Plain Superphosphates. 



The particular rate of vahiation of raw materials used for 

 manurial purposes, depends in many instances, aside from 

 their composition, largely on their mechanical condition, and 

 their peculiar form of combination and association ; for in- 

 stance, factory waste, animal and vegetable refuse of various 

 description, etc. No general rule can be offered as a safe 

 guide to approximate their cash value ; each case ought to be 

 decided on its own merits. 



II. 



Trade Values of Ammoniated Superphosphates, Special Ma- 

 nures AND Mixed Fertilizers of High Grade, in 1884. 



The organic nitrogen in these classes of goods has been 

 valued at the highest figure laid down in the above trade 

 values of fertilizing ingredients in raw materials, namely, 

 twenty cents per pound. Insoluble phosphoric acid has 

 been valued at four and one-half (4^) cents, the cost of 



