1890.] PUBLIC DOCUMENT — No. 33. 235 



Trade Values of Fertilizing Ingredients — Concluded. 



events per Pound. 



Phosphoric acid in dry ground bone, fish bone and tankage, . 7 



Phosphoric acid in fine medium bone and tankage, ... 6 



Phosjihoric acid in medium bone and tankage, .... 5 



Phosphoric acid in coarse bone and tankage, .... 4 



Phosphoric acid in fine-ground rocli phosphate, .... 2 

 Potash as high-grade sulphate, and in form free from muriates 



or chlorides; ashes, etc., 6 



Potash as kainite, 4i 



Potash as muriate, 4J 



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 fertilizing 

 ingredients in raw materials, namely, nineteen 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. For similar 

 reasons, the insoluble phosphoric acid is valued in this con- 

 nection at three cents ; it being assumed, unless found other- 

 wise, that it is from bone or similar source, and not from 

 rock phosphate. In this latter form the insoluble phos- 

 phoric acid is worth but two cents per pound. 



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

 six months preceding March, 1889, the respective ingredi- 

 ents 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 1, plus twenty per cent, in case of 

 goods for which we have Avholesale quotations. The valua- 

 tions obtained by use of the above figures will be found to 

 agree fairly with the retail price 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. 



