5° 4 Afr. Hatchett's Analysis of 
These precipitates were separately collected and washed on 
filters. 
When examined by the blow-pipe, all of them afforded a 
yellowish-green glass, with phosphate of ammoniac and soda. 
These precipitates dissolved in diluted nitric acid with ef- 
fervescence, and sulphuric acid precipitated sulphate of lead, 
after which Prussian blue was precipitated by prussiate of 
pot-ash, and the liquor became brown. 
E. The blue solution, which consisted of the muriatic and 
molybdic acids combined with soda, was evaporated. 
When the liquor became hot, the colour changed from 
blue to pale yellow, and the evaporation was continued with- 
out any other perceptible alteration till the whole was become 
a dry concrete salt. 
I dissolved this salt in distilled water, and added muriatic 
acid, so as to be in a small excess. The liquor was then eva- 
porated to half, and was set in a cool place. 
The following morning I found a quantity of crystallized 
muriate of soda at the bottom of the bason, covered with a 
white flocculent precipitate, which I collected and edulcorated 
on a filter. The rest of the liquor was repeatedly evaporated, 
till I had separated the greatest part of this white matter from 
the muriate of soda. 
The last portion of the liquor, however, still contained some 
molybdic acid, combined with the muriate of soda ; for after 
it had been several times evaporated and again dissolved, it 
became blue when muriate of tin was added; or if muriatic 
acid was first poured in, prussiate of pot-ash produced a red- 
dish-brown precipitate of molybdama. 
