326 On the Greensand of New Jersey as a source of Potash. 
silica, the ratio 1: 2:4, while the above analysis gives the ratio 
kek 52°06: Ass sins “é 
This method -appears to possess advantages for decomposing 
silicates which contain both the alkalies, over the ordinary meth- 
+. ods of fusion with the hydrate or with the carbonate of baryta. 
_. Hydrate of -baryta: generally acts upon the-crucible, causing the 
~~ mass to adhere to it ; and upon the affusion of hydrochloric acid, 
any potash which the mineral may contain, consequently enters 
into combination as bichlorid.of. platirfum and potassium, and re- 
_ mains with the silica. "The carbonate of baryta process requires 
an intense heat, and is difficult of- execution. — 
-. .~4. The chlorid of barium process proposed in this paper is prob- 
Fe ably not*more laborious than an ordinary carbonate of soda fu- 
nr Sion, and is applicable in cases in which the silicate contains both —__ 
“potash soda ee es 
T= 
P3 - Art. XXVIIL—On the availability of the Greensand of New 
~—-) Jersey as a source of Potash and its Compounds ; by Henry 
Wortz, of New York City. 3 , 
important end, but owing to the peculiar chemical and physical _ 
properties of feldspar, the success of these researches has been 
doubtful. . i me Maer 
It is true that the feeble affinities exerted by mineral waters 
per to show that this substance is far superior to feldspar in ifs 
adaptation to this purpose. 
