and Naphthaline, and on.a new Acid produced. 401 
was soluble in water and alcohol, and was decomposed by 
heat, with the general appearances already described. 
Copper. Hydrated peroxide of copper formed an acid salt 
with the acid, and the solution evaporated in the air left ra- 
diated crystalline films. The dry salt when heated fused, 
burnt with flame, and exhibited the usual appearances. 
Nickel. The salt of this metal was made from the moist 
carbonate. It was soluble, crystalline, of a green colour, and 
decomposed by heat in the usual manner. In one instance an 
insoluble sub-salt was formed. 
Silver. Moist carbonate of silver dissolved readily in the 
acid, and a solution, almost neutral, was quickly obtained. It 
was of a brown colour, and a powerful metallic taste. By 
evaporation it gave a splendent, white, crystalline salt; not 
changing in the air except when heated; but then, burning 
with flame, and ultimately leaving pure silver. When the so- 
lution of ‘the salt was boiled for some time, a black insoluble 
matter was thrown down, and a solution obtained, which b 
evaporation gave abundance of a yellow crystalline salt. The 
changes which took place during the action of heat in the 
moist way were not minutely examined. 
Mercury. Moist proto-carbonate of mercury dissolved in 
the acid forming a salt not quite neutral, crystallizing feebly 
in the air, white, of a metallic taste, not deliquescent, and de- 
composed with various phaznomena by heat. By re-solution 
in water or alcohol, and heat, a sub-salt of a yellow colour 
was formed. 7H 
The moist hydrated per-oxide of mercury also dissolved in 
the acid, forming an acid solution, which by evaporation gave 
a yellowish deliquescent salt, decomposed by heat, burning in 
the air, and entirely volatile. 
3. Analysis of the Acid and Salts. 
When solution of the pure acid was subjected to the voltaic 
battery, oxygen and hydrogen gases were evolved in their 
pure state: no solid matter separated, but the solution became 
of a deep yellow colour at the positive pole, occasioned by the 
evolution of free sulphuric acid, which re-acted upon the 
hydro-carbon. A solution of the barytic salts gave similar 
results. 
The analytical experiments upon the composition of this 
acid and its salts were made principally with the compound of 
baryta. This was found to be very constant in composition, 
could be obtained anhydrous at moderate temperatures, 
and yet sustained a high temperature before it suffered any 
change. ? 
Vol. 67. No. 338. June 1826. 3 E A portion 
