174 AGRICULTUKAL EXPERIMENT STATION. [Jan. 



Potash Fertilizers. 



[I. Muriate of Potash. II. Sulphate of Potash and Magnesia, sent on from 



Amherst, Mass.] 



Saltpetre Waste from Gunpowder Works. 



[Sent on from Acton, Mass.] 



Per cent. 



Moisture at 100° C, 5.19 



Potassium oxide, 15.04 



Sodium oxide, 36.82 



Total calcium oxide, .47 



Total magnesium oxide, .27 



Niti'ogen, 1.90 



Sulphuric acid, 1.02 



Total chlorine, 63.50 



Calcium chloride, .05 



Magnesium chloride, .63 



Insoluble matter, Trace. 



The composition of this material varies in different samples 

 in a marked degree. Its application on forage crops and on 

 grass lands in particular has proved highly satisfactory. 



