1826.] and Naphthaline, and on a new Acid produced, 209 



metric. When heated in a tube, naphthaline was evolved ; but , 

 the substance could be retained for hours at a temperature of 

 500° F. before a sensible portion of naphthaline had separated : 

 a proof of the strength of the affinity by which the hydro-carbon 

 was held in combination. When a higher temperature was 

 apj)hed, the naphthaline, after being driven off, was followed by 

 a little sulphurous acid, a small portion of tarry matter, and a 

 carbonaceous sulphate and sulphuret were left. 



This salt was not affected by moderately strong nitric or 

 nitro- muriatic acid, even when boiled with it ; and no preci- 

 pitation of sulphate took place. When the acids were very 

 strong, peculiar and compUcated results were obtained. When 

 put into an atmosphere of chlorine, at common temperatures, it 

 was not at all affected by it. Heat being applied, an action 

 between the naphthaline evolved, and chlorine, such as might be 

 expected, took place. 



When a strong solution of the pure acid was poured into a 

 strong solution of muriate of baryta, a precipitate was formed, 

 in consequence of the production of this salt. It was re-dissolved 

 by the addition of water. The fact indicates that the affinity of 

 this acid for baryta is stronger than that of muriatic acid. 



The second, or g/oWw^ 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 naphthaline, 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 char- 

 ring the substances. The tint, at first red, became olive-green ; 

 some sulphurous acid was evolved, and the whole would ulti- 

 mately 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 when 



^ew Series, ^oi.,^u, p 



