196 Intelligence and Miscellanies. 
In two trials also, which I made, one upon 14 grs. and the 
other upon 20 grs. of the mineral, to learn if possible the ex- 
act proportion of chrome it contained, (in one eee sepa- 
rating it from its acid combination with potash, by the addi- 
tion of muriate of ba arytes, and in the other by the Spreitil 
Nitrate of mercury,) I became satisfied from the smallness of 
its proportion, which was such as to prevent my estimating 
it by weight, that it did not fst an essential ingredient in 
the composition of the mineral. 
After these preliminary experiments, I entered upon the 
following 
ANALYSIS, 
A. 17.8 grs. reduced to powder, were mingled with double 
their weight of potash and 10 grs. of nitrate of potas 
mixture was kept at a red heat in a silver crucible for one 
hour. The calcined mass which had evidently undergone 
fusion, presented a yellowish green color, which it cominu- 
nicated to its solution in water. On the addition of nitric 
acid, the fused mineral became perfect] soluble, wi 
exception of a few white floceuli of silex, which were seen 
floating through the solution, 
B. The nitric a was evaporated to dryness, in a 
= stals of ees salt. 
). The insoluble oxide of iron and silex (B.) was heated to 
rec in a close platina crucible over an alcoholic lamp, 
