and naphthaline, and on a new acid produced. 15s 



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 

 evaporate^ 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 



