7a MINER ALOGICAI 
§ 3 * 
The filtred colourlefs iolution of the 
/ 
wolfram melted with alkali, was fatu- 
rated by nitrous acid, by which the acid 
of wolfram was precipitated in form of a 
white tender earth. This precipitate 
walhed and dried gave a yellowifh white 
confiderably heavy powder, and weighed 
15 drams. If the acid of wolfram be 
precipitated when the folution of the 
alkalized wolfram is ftill warm, the mix¬ 
ture obtains a blue colour, which it lofes 
*•. * 
again on growing cool, 
% 
§ 
The properties of this acid, and the 
effedts it produced upon other fubftances, 
I found in general to agree with what Mr. 
Scheek has faid, who is the difcoverer of 
it. 
