and Naphthaline, and on a new Acid produced. 399 
the salt was deposited rapidly from its hot saturated solution, 
it appeared in the form of a soft granular mass. When dry, 
it was white and soft, not changing in the atmosphere. It was 
readily soluble in water and alcohol, but was not affected by 
zether. Its taste was decidedly bitter. When heated in the 
air on platinum foil it burnt with a bright smoky flame, like 
naphthaline, sending flocculi of carbon into the atmosphere, 
and leaving a mixture of charcoal, sulphuret of barium, and 
sulphate of baryta. 
After being heated to 212° for some time, the salt appeared 
to be perfectly dry, and in that state was but very slightly hy- 
grometric. When heated in a tube naphthaline was evolved; 
but the substance could be retained for hours at a tempera- 
ture of 500° Fahr. 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 applied, 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 them; and no 
precipitation of sulphate took place. When the acids were 
very strong, peculiar and complicated results were obtained. 
When put into an atmosphere of chlorine, at common tem- 
peratures, 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-dis- 
solved by the addition of water. The fact indicates that the 
noon of this acid for baryta is stronger than that of muriatic 
acid. 
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 carbona~- 
ceous mixture of sulphuret and sulphate. When heated in a 
tube they gave off a small quantity of naphthaline, some em- 
pyreumatic fumes, with a little sulphurous acid, and left the 
usual product. . 
This salt seemed formed in largest quantity when one volume 
of 
