348 BOARD OF AGRICULTURE. 



Per cent. 



Calcium oxide T.66 



Phosphoric acid ....... 2.75 



Insoluble matter, sand, &c 10.40 



As the previous analytical statements can aid in an ap- 

 proximate valuation, they may not be without interest to 

 those who are in the habit of using the above-stated materials 

 for fertilizing purposes. The composition of these plants 

 varies on account of the usual presence of shells, and other 

 incidental products of the ocean. 



Amhekst, Feb. 1, 1879. 



C. A. GOESSMANN, 



State Inspector of Commercial Fertilizers. 



APPENDIX. 



COMPOSITION 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 46.6 parts of potassium oxide. 

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



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 46 i^arts of sulphuric acid. 

 Bone phosphate (tricalcic phosphate) contain 46 parts of phosphoric 



acid and 54 j)arts of calcium oxide (lime). 

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



parts of sulphuric acid. 

 Uncalcined pm'e gypsum contain 32.5 parts of calcium oxide 



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

 Carbonate of lime contain 56 parts of calcium oxide (lime) and 



44 parts of carbonic acid. 

 Sulphate of magnesia (free of water) contain 33.3 per cent of 



magnesium oxide (magnesia) and 66.6 per cent of sulphuric 



acid. 



C. A. G. 



The Report was accepted. 



