148 AMERICAN MANURES. 



This water should be thoroughly mixed with the 

 bones before the acid is applied. 



100 Ibs. Bones, at 1^ cents per Ib $1.25 



52 " Sulphuric Acid, at 2 cents 1.30 



25 " Water.. 



177 " $2.55 



4-11 " Loss in Gases. 



172.89 " 



From the above Table we find that the mate- 

 rial of one ton of such superphosphate of lime 

 costs the manufacturer $29.50. As the 100 Ibs. 

 of bones contain 28.05 Ibs. of phosphoric acid, 

 the 172.89 Ibs. of the combination would contain 

 the same with 5 Ibs. of nitrogen ; and one ton 

 would contain 324 Ibs. of soluble phosphoric 

 acid, and 57 Ibs. of nitrogen, showing the ton of 

 superphosphate to be worth to the farmer as fol- 

 lows (assuming 12i and 15 cents, per Ib. as the 

 value of soluble phosphoric acid and nitrogen) : 



324 Ibs. of Soluble Phosphoric Acid, at 12J cents $40.50 



57 " of Nitrogen in organic matter, at 15 cents 8.55 



Bags 2 00 



$51.05 



The cost to the manufacturer is, as follows : 



1157 Ibs. of Bones, at 1| cents $14.47 



Grinding, at $5 per ton 2.89 



602 Ibs. Sulphuric Acid, at 2 j- cents 15.05 



288 " Water 



2047 " Labor and Bags 5.00 



47 " Loss in Gases 



2000 " Total cost $37.41 



