the Carinthiaii Molybdate of Lead. 
305 
Experiments on the White Precipitate. 
1. It was not dissolved when water was boiled on it. 
2. When digested with sulphuric or muriatic acid, the 
greatest part was dissolved, and prussiate of pot-ash produced 
a precipitate of a greenish-brown colour. 
3. A small part became yellow when nitric acid was dis- 
tilled from it. 
4. The solutions of carbonate of pot-ash, soda, and ammo- 
niac, dissolved the greater part ; and when these solutions were 
saturated with muriatic acid, prussiate of pot-ash produced 
precipitates like those of the acid solutions. 
As this precipitate in a great measure resembles that which 
is described in § X. I shall, when I come to that part, give a 
more ample account of it. 
F. I next examined the blue solution, which consisted of 
the muriatic and molybdic acids combined with ammoniac. 
It was first filtrated, and then gradually evaporated. When 
evaporated to half of the original quantity, the colour was 
green, but towards the end of the operation it again became 
blue, and when evaporated to dryness, the residuum was a 
whitish salt, tinged in some parts with blue. 
G. This salt was reduced to powder, and was put into a 
small glass retort, to which a receiver was fitted. I then 
placed the retort in a small open furnace, and gradually raised 
the fire till the bottom of it began to melt. The retort was 
now removed, and I examined the contents. The, receiver 
contained some water, and a small quantity of muriatic acid. 
Near the extremity of the beak of the retort was some mu- 
riate of ammoniac, with some fuming muriatic acid, and the 
Rr 2 
