OBSERVATIONS. Jl 
and mixed with an equal weight of fixed 
vegetable alkali, and melted in a cru¬ 
cible. It foon fufed in a ftrong heat, 
and a fmell of arfenic was perceived. 
This dark green fcoria-like mafs was 
poured upon a flat ftone, reduced to 
a powder, and digefted for a proper 
time in diftilled water in a matrafs, and 
then filtred. 
§ 2. 
' , . ■, I • i 1 • ■ . ■ " ' . ' .. , ■ 
The refiduum confifting of a loofe 
black powder, which weighed i o drams, 
was again mixed with equal parts of fixed 
vegetable alkali and heated. Now no 
fufion could be produced, but, it be¬ 
came only red hot. The water poured 
upon it afterwards diflblved nothing, and 
took up only the alkali. This refiduum 
when dried, proved to be a phlogifticated 
calx of iron, attractable by the magnet. 
