306 Popuz. 
which from its being insoluble in acids and gritiy betweei 
the teeth, we concluded to be silex. The liquor in which 
this residue was digested, and which was separated by the 
filter, was treated with carbonate of ammonia and a white 
precipitate obtained (No. III.) which being calcined, weighed 
0.9 ~ This was entirely soluble in a mixture of diluted 
sulphuric acid and sulphate of potash, and crystals of alum 
We therefore oe this precipitate (C. No. J.) repeatedly 
siliceous residue (C. No. II.) might contain a small propor- 
tion of alumine, — pac: migh j aa 
process as th : genes C. No. I.) just described. Alum 
was formed and there was a loss of 3.33 grs. (No. III.) which 
was shown to be alumine. The remainder 11.47 grains, 
(No. 4.) was doubtless silex. 
E. The liquor that remained after the separation of B. No. 
8. was tested with an infusion of galls, and gave decided in- 
dications of the presence of iron. No attempt was made to 
ascertain the proportion of this ingredient; and ir » we 
are not quite sure, bat that the muriate of lime used might 
have contained a small quantity of iron. 
F. From the dark stain that appeared on the platina cru- 
cible, in which the mineral was heated with carbonate of 
soda, a suspicion was excited, that lithia might be present. 
We made an attempt to decompose a small bit of the mineral 
with = soda, by means of the common blowpipe, on pla- 
tina foil; and we likewise began the like comparative trials 
with spodumene from Sweden and Massachusetts; a dark 
Btain in most instances appeared upon the foil around the 
