153 
and naphthaline, and on anew acid produced. 
The second, or glowing salt of baryta, was obtained in small 
crystalline groups. The crystals were prismatic, colourless, 
and transparent : they were almost tasteless, and by no 
means so soluble either in hot or cold water as the former 
salts. They were soluble in alcohol, and the solutions were 
perfectly neutral. When heated on platinum foil they gave 
but very little flame, burning more like tinder, and leaving 
a carbonaceous mixture of sulphuret and sulphate. When 
heated in a tube they gave off a small quantity of naphtha- 
line, some empyreumatic fumes, with a little sulphurous 
acid, and left the usual product. 
This salt seemed formed in largest quantity when one 
volume of naphthaline and two volumes of sulphuric acid 
were shaken together, at a temperature as high as it could 
be without charring the substances. The tint, at first red, 
became olive green ; some sulphurous acid was evolved, 
and the whole would ultimately have become black and 
charred, had it not been cooled before it had proceeded thus 
far, and immediately dissolved in water. A solution was 
obtained, which though dark itself, yielded, when rubbed 
with carbonate of baryta, colourless liquids ; and these when 
evaporated furnished a barytic salt, burning without much 
flame, but which was not so crystalline as former specimens. 
No attempt to form the glowing salt from the flaming salt 
by solution of caustic baryta, succeeded. 
Strontia. The compound of this earth with the acid already 
described very much resembled the flaming salt of baryta. 
When dry it was white, but not distinctly crystalline : it was 
soluble in water and alcohol ; not alterable in the air, but 
MDCCCXXVI. X 
