246 



BOARD OF AGRICULTURE. 



B. — Sulphate of Potassa. 



These samples are taken from home-manufactured articles ; 

 Nos. I., II., III. are produced from the muriate of potash, as 

 above mentioned, by means of sulphuric acid ; No. IV. comes 

 evidently from some other branch of chemical industry. They 

 consist mainly of the sulphates of potassa and soda, besides 

 more or less of free sulphuric acid, or acid sulphates ; namely, 

 from 57 to 65 per cent, of neutral sulphate of potassa, and 

 from 5 to 20 per cent, of neutral sulphate of soda, besides 

 from 5 to 24 per cent, of sulphuric acid. The potassium 

 oxide contained in these salts has been sold in small lots at 

 from 8.5 to 9.5 cents per pound ; or from $60 to $65 per ton 

 of 2,000 pounds of the salines. 



C. — Magnesia containing Potash-salts (Kainits). 



Potassium oxide, 

 Sodium oxide, 

 Magnesium oxide 

 Calcium oxide, 

 Sulphuric acid, 

 Chlorine, 

 Insoluble matter (in water), 

 Moisture, . 



25.02 

 _* 



8.40 



2.92 



17.62 



_* 



2.90 

 5.50 



24.82 

 7.17 



11.97 

 _* 



17.20 



5.40 



9.69 



16.36 



4.54 



1.61 



9.86 



_* 



5.17 

 10.00 



* Not determined. 



Samples I. and II. are artificial kainits, or calcined potash, 

 refuse-salts; No. III. represents the composition of Stassfurt 



