310 Mr. Hatchett's Analysis of 
lized sulphate of pot-ash covered with a flocculent white pre- 
cipitate. This I separated from the sulphate of pot-ash, and 
by repeated evaporations obtained the remainder. 
These white precipitates were kept separate in the order in 
which they were obtained, and were washed and dried. 
Experiments on the first Portions of the White Precipitate ob- 
tained by the Addition of the Alkali , and by the first Eva- 
poration. 
The white precipitate, when exposed on charcoal to the 
blow-pipe, melted into a pale green transparent globule. 
With borax it formed a yellow transparent glass when hot, 
which as it cooled became opaque, and of an ash colour. 
When added to the phosphate of ammoniac and soda in 
fusion, a yellowish green transparent glass was produced. 
Water boiled for a considerable time on the precipitate did 
not apparently dissolve it ; but muriate of barytes shewed the 
presence of a small quantity of sulphuric acid. 
Nitric acid distilled to dryness from some of the precipitate, 
produced very little alteration, excepting that a small part be- 
came yellow. 
Sulphuric acid was digested on a portion of the precipitate, 
and dissolved part of it ; the remainder appeared unchanged. 
The solution was diluted with distilled water, and prussiate 
of pot-ash being added, produced a blue precipitate. 
Muriatic acid digested on another portion, turned it at first 
yellow, but afterwards the greater part became white, and 
remained undissolved. 
The solution afforded a blue precipitate with prussiate of 
