324 Mr. Hatchett's Analysis of 
for the greater part absorbed by the charcoal, the edges of 
which became covered with a blue powder. 
When melted in a spoon of platina, some yellow powder 
was deposited near the edges, and a brownish-yellow shining 
matter was formed, which became streaked in cooling. 
With borax it produced a brownish-yellow glass, but if the 
quantity of molybdic acid was small, the colour was some- 
times blue when the globule was heated by the interior flame. 
With soda in the platina spoon it formed a brownish opaque 
matter. 
And with phosphate of ammoniac and soda it formed a 
glass, which (in proportion to the quantity of molybdic acid) 
varied from a greenish blue to a deep blue. 
B. Ten grains of the yellow molybdic acid were boiled 
with six ounces of distilled water. About three grains were 
dissolved, and the solution when filtrated was of a pale yellow 
colour. 
It had scarcely any perceptible flavour, but turned litmus 
paper red. 
When prussiate of pot-ash was added to a portion of the so- 
lution, no apparent change was effected ; I therefore added a 
small quantity of nitric acid, which produced a copious brown 
precipitate of molybdasna. The sulphuric and muriatic acids 
had the same effect, when poured into the solution, either be- 
fore or after the addition of prussiate of pot-ash. 
With muriate of tin it changed to a beautiful deep blue. 
Lead was precipitated from solution of nitrate of lead, in 
the form of a pale yellow precipitate, which was a regenerated 
molybdate of lead. 
Nitrate of barytes rendered the solution slightly turbid, but 
