J. L. Smith on determining the Alkalies in Minerals. 53 
containing a certain amount of the hydrated oxyd—for these 
reasons, we would express emerald nickel by Ni€+2(NiH,). 
It is without question a distinct species, and a most beautiful 
and interesting mineral, both from the richness of its color and its 
association with chromic iron. 
Composition ; a quarter of an ounce of selected fragments sent by 
Mr. L. White Williams, furnished us with about one gramme of 
the pure mineral. 
University of Virginia, May 6th, 1853. 
Arr. VI.—New and ready method of determining the Alkalies 
in Minerals: Panr 1l—Conversion of the Sulphates into 
Chlorids : Qualitative Determination of the mixed Alkalies : 
Separation of the Alkaline Chlorids from each other, with a 
more direct method of obtaining them from silicates not soluble 
tm Acids ; by J. Lawrence Sorrn, Professor of Chemistry in 
the University of Virginia. 
Conversion of the Sulphates into Chlorids. 
31. In continuation of the subject, the next point to be con- 
sidered is the conversion of the sulphates of the alkalies into 
em 
to the filtrate, to insure there being an excess of the lead salt. 
33. The filtrate is then warmed and sulphuretted hyd 
rogen 
are must be taken to see that there is an excess of sul- 
* This Journal, May, 1853. 
