EXTENSION OF GERMAN MINES. 



301 



Douglas Potash Fertilizer, JSFo. I. — It is a sulphate of 

 potassa of 95 to 99 per ceut., equal t > from 51.4 to 53.5 per 

 cent, of potassium oxide. 



Douglas Potash Fertilizer, No. II. — It is a muriate of 

 potash, which differs from most articles of that name ; for 

 it contains besides from 70 to 75 per cent, of chloride of 

 potassium, from 20 to 25 per cent, of sulphate of magnesia. 



These valuable articles, it is stated, will be sold with a full 

 guarantee of their represented composition, and at prices 

 which I do not doubt will secure a good patronage. 



The plan, carried out as mentioned, cannot do otherwise 

 than exert a beneficial influence ou the present condition of 

 the entire trade in potash fertilizers. 



Crude Carxallite. 



This substance represents the main bulk of the raw material 

 which serves for the manufacture of the German concentrated 

 potash salts. 



A handsome specimen of a superior quality of crude carnal- 

 lite from the Douglashall mines, which has been kindly pre- 

 sented to me, gave, on a careful examination, the subsequent 

 analytical results : — 



Potassium oxide, . 

 Sodium oxide, 

 Magnesium oxide, 

 Calcium oxide (lime), 

 Sesquioxide of iron, 

 Chlorine, 

 Sulphuric acid. 



13.68 



7.66 



13.19 



none. 



0.04 



41.56 



0..56 



The saline mass consisted, therefore, mainly of, — 



Chloride of potassium, 21.65 percent. 



" of magnesium, 30.66 " " 



of sodium, 13.89 " " 



Sulphate of magnesia, 0.84 " " 



and contained thus 80 to 81 per cent, of genuine carnallite. 

 The average of the crude carnallite at present sold to the 

 factories is stated to contain but QQ per cent, of that com- 

 pound. 



