3oo Mr. Hatchett's Analysis of 
Pot-ash expelled some ammoniac from a portion of the dry 
salt. 
And a precipitate was produced when muriate of barytes 
was added to the solution. This white saline matter was there- 
fore a mixture of sulphate of ammoniac with a small portion 
of muriate of lead. 
The solution to which the sulphuric acid had been added 
was again evaporated to a considerable degree, and when cold 
it resembled a very thick mucilage of a pale yellow colour. It 
readily dissolved in water, and contained sulphuric acid in great 
excess. 
1. Prussiate of pot-ash only changed the colour to pale green. 
2. Carbonate of pot-ash expelled the ammoniac, and a white 
precipitate like starch was formed, which was principally com- 
posed of molybdic acid and pot-ash, on which I shall not make 
at present any observations, as it will be hereafter noticed in 
several parts of this paper. 
It is worthy of notice, that prussiate of pot-ash did not pre- 
cipitate the molybdaena from this mucilaginous salt, and that 
when the pot-ash expelled the ammoniac it formed with the 
molybdic acid a salt more difficultly soluble than that formed 
by ammoniac. 
E. To the second portion of the solution I added three 
ounces of concentrated nitric acid, and evaporated it nearly 
to dryness. 
A bright yellow matter was deposited, which I found to be 
molybdic acid combined with a portion of lead. 
There was also a small quantity of liquid, which I diluted 
with distilled water, and then precipitated some sulphate of 
lead by sulphuric acid. When this was separated I added 
