the Carinthian Molybdate of Lead. 323 
The solution was then filtrated, and being saturated with pure 
ammoniac, I obtained a small quantity of oxyde of iron, which, 
when dried as before, weighed one grain. 
By this analysis, 250 grains of the ore yielded 
Grains. 
oxyde of lead • — — 146 
molybdic acid — — 95 
Grs. 
oxyde of iron | ^ 2 1 — 5-3 
and siliceous earth — 07 
grs. 246 9 
the loss was therefore — 3 1 
250 o 
which I am inclined to place principally to the account of the 
lead, as it is scarcely possible to decompose the sulphate of 
lead without some loss, occasioned by the action of the alka- 
line solution. 
§ XII. Experiments on the yellow Molybdic Acid , obtained by 
the Analysis. 
A. When exposed to the dblow-pipe on charcoal, it was 
melted by the exterior flame, and the sides of the charcoal 
were covered with small long crystals, which had a metallic 
lustre resembling silver.* 
When the heat was continued the whole was melted, and 
* Scheele mentions a similar product obtained when molybdsena was exposed to 
the blow-pipe. Essays, p. 230. — Also by sublimation. Essays, p. 238. — And Me- 
tnoire sur la Molybdene, par M. Pelletier, Journ, de Physique, Decembre, 1785, 
P- 439 - 
