VALUATION OF MANURES. 183 



It may perhaps be useful to give an example of the applica- 

 tion of the table of " unit value" to the calculation of the 

 money value of a manure from its analysis. 



Suppose a sample of dissolved bones to yield the following 

 numbers on analysis : 



% 



Total phosphorus pentoxide ... 17 '1 



Soluble ,, ,, 8-6 



Insoluble 8-5 



Nitrogen ... ... ... 2 - 5 



Its value per ton would be calculated as follows : 



% Value " per unit." s. d. 



8 - 6 x 5/5. Value of soluble phosphorus pentoxide 267 

 8-5 x 2/9. ,, insoluble ,, = 1 3 4J 



2-5 x 12/-. ,, nitrogen ... ... = 1 10 



4 19 111 



In America the plan of expressing the trade value of manu- 

 rial ingredients in price per pound is general. The following 

 table (quoted by Wiley from Bulletin 51, 1894, of the Mass. 

 Agric. Exp. Station) gives the estimated trade values : 



Cents per Ib. or d. 



Nitrogen in ammonium salts ... ... ... 19 9 



,, ,, nitrates ... ... ... ... 14 7J 



,, ,, dry and fine fish, meat, blood, &c. ... 18| 9 



,, ,, fine bone and tankage ... ... 16 8J- 



,, ,, cotton-seed meal, castor cake, &c. ... 15 7^- 



,, ,, medium bone and tankage ... ... 12 6 



,, ,, coarse bone and tankage ... ... 7 3 



,', ,, hair, horn, and coarse fish refuse ... 6 3 



Phosphorus pentoxide, soluble in water ... ... 6 3 



,, ,, ,, ,, ammonium citrate 5^- 2f 



,, ,, in fine bone and tankage ... 5J 2f 



,, ,, ,, medium bone and tankage 3 1^ 



,, ,, ,, coarse bone and tankage 2 1 



,, ,, ,, fish, oil-seed cakes, and 



wood ashes ... 5 2^ 



,, ,, ,, mixed fertilisers, insoluble 



in ammonium citrate 2 1 



