I had never before feen in a folution 
of cobalt. The other precipitate of co¬ 
balt, prepared from the ore in folution, 
with the fame acid, gave, on the con¬ 
trary, a dark grafs-green colour. 
The caufe of thefe appearances feemed 
to be the fmoking principle of the 
marine acid. For as foon as the folution 
was diluted with water, the colours of 
both difappeared, and changed to a light 
rofe red. With marine acid, which 
was not fo concentrated as to fmoke, 
the folutions obtained immediately a red 
colour, as if vitriolic or nitrous acid 
had been - ufed, 
§ 3 * 
From the external appearance, as 
well as from the analylis, I imagined 
this cobalt from Cornwall, might give, 
like thofe employed in Saxony, a very 
fine fmalt. The refult of experiments 
made 
