244 



BOARD OF AGRICULTURE. 



XXIV. 



Bone Superphosphate. 



(B. Randall, Bostoo, Mass.; Thomas Aubin, agent.) 



Valuation per ton of two thousand pounds 



180 pounds of soluble phosphoric acid 

 27.4 pounds of i-everted phosphoric acid 

 54.4 pounds of nitrogen .... 



$21 60 



2 47 



10 88 



$34 95 



C. A. GOESSMANN, 

 State Inspector of Commercial Fertilizers. 



Amherst, Mass., Feb. 2, 1881. 



APPENDIX. 



COMPOSinoiSf OF some compounds in FERTILIZERS. 



One hundred parts of — 



Nitric acid contain 26 parts of nitrogen. 



Ammonia contain 82.35 parts of nitrogen. 



Pure nitrate of potassa (saltpetre) contain 53.4 parts of nitric acid, 



and 40. G parts of potassium oxide. 

 Pure nitrate of soda (Chili saltpetre) contain 63.25 parts of nitric 



acid. 

 Chloride of potassium contain 52.4 parts of potassium, 63.1 parts 



of potassium oxide, and 47.6 parts of chlorine. 

 Pure sulphate of potassa contain 54.9 parts of potassium oxide, 



and 40 parts of sulphuric acid. 

 Bone phosphate (tricalcic phosphate) contain 46 parts of phos- 

 phoric acid, and 54 parts of calcium oxide (lime). 

 Calcined gypsum contain 41 parts of calcium oxide (lime), and 59 



parts of sulphuric acid. 

 Uncalcined pure gypsum contain 32 5 parts of calcium oxide 



(lime), 46.5 parts of sulphuric acid, and 21 parts of water. 



