J. L. Smith on the analysis of Meteorie Irons. 333 
only recognized by the most delicate tests after the sulphur of 
the collected precipitate is burnt away) ; the solution, thrown on 
afilter, leaves the precipitated sulphur, the little trace of copper, 
and all the excess of the baryta that had been added, if the ex- 
cess had been slight. The filter is then ignited in a porcelain 
crucible—the residue treated with a few drops of nitric and sul- 
phuric acids, which suffices to dissolve the copper, and when 
precipitated by acetate of with all the well known pre- 
Cautions. [ eli this precipitate only ames and detac it 
from the filter by washing it into a beaker, and re-dissolving it 
tion; and after considerable experience, I must say that it is the 
Only method of separating, with any degree of accuracy, iron 
ickel, 
