328 Mr. Hatchett's Analysis of 
molybdic acid was dissolved, a small quantity of white floc- 
culent matter was precipitated. 
The clear solution was then poured from the residuum. 
Prussiate of pot-ash did not produce any precipitate until 
the alkali was saturated with an acid. 
The effects of muriate of tin were also the same as those 
mentioned in the former experiment. 
A part of the solution was evaporated to half, and the next 
morning I found crystals, which although not very distinct, 
appeared to be in the form of four-sided tables with the angles 
truncated. 
These crystals dissolved in water without leaving any resi- 
duum, and (when the solution was saturated with muriatic 
acid) the molybdic acid was precipitated by prussiate of pot- 
ash, as in the former experiments. 
H. Two ounces of carbonate of ammoniac in solution were 
poured on ten grains of molybdic acid, which appeared to 
be more readily dissolved than when the fixed alkalies were 
employed. 
The solution appeared slightly turbid, but very little of it 
was precipitated. 
The effects produced by prussiate of pot-ash and muriate 
of tin were the same as in the preceding experiments. 
When a portion of the solution was distilled to dryness, 
part of the molybdic acid remained unchanged, but another 
part was deprived of oxygen, and appeared in the form of a 
dark grey powder/* 
The remaining part of the solution was considerably eva- 
* Scheele has observed a similar effect. 
