and Naphthaline, and ona new Acid produced. 405 
operated upon was pure, and in a distinctly crystalline state. 
It had been heated to about 440° F. for three hours in a me- 
tallic bath. Ten grains of this salt exposed to air for forty 
hours increased only 0:08 of a grain in weight. These when 
converted into sulphate of baryta by heat and sulphuric acid, 
gave 4:24 crains. Seven grains by carbonate of baryta, oxide | 
of copper, heat, &c. gave 6°02 grains of sulphate of baryta: 
hence 10 grains of the salt would have afforded 8°6 grains of 
the sulphate equivalent to 2°915 grains of sulphuric acid. Five 
grains when heated with oxide of copper gave 16°68 cubic 
inches of carbonic acid gas, equal to 7°772 grains, and equiva- 
lent to 2°12 grains of carbon. The water formed amounted 
to 1:2 grains, equivalent to 0°133 of a grain of hydrogen. 
From these data, 100 grains of the salt would appear to 
furnish 
Baryta .... . 28°03 . . 78 or 1 proportional. 
Sulphuric acid . 29°13 . 81:41 nearly 2 proportionals. 
Carbon .... 42°40 . 118° approaching to 20 ditto. 
Hydrogen... 2°66. 7:4 or 7:4 proportionals. 
10222, 
results not far different from those obtained with the former 
salt. 
I have not yet obtained sufficient quantities of this salt in a 
decidedly crystalline state to enable me satisfactorily to ac- 
count for the difference between it and the flaming salt. 
Attempts were made to form similar compounds with other 
acids than the sulphuric. Glacial phosphoric acid was heated 
and shaken in naphthaline, but without any particular results. 
A little water was then used with another portion of the ma- 
terials, to bring the phosphoric acid into solution, but no de- 
cided combination could be obtained. Muriatic acid gas was 
brought into contact with naphthaline in various states, and 
at various temperatures, but no union could be effected either 
of the substances or their elements. — 
Very strong solution of potash was also heated with naph- 
thaline, and then neutralized by sulphuric acid; nothing more 
however than common sulphate of potash resulted. 
As the appropriation of a name to this acid- will much faci- 
litate future reference and description, I may perhaps be al- 
lowed to suggest that of sepho-naphthalic acid, which suffi- 
ciently indicates its source and nature without the inconve- 
nience of involving theoretical views. 
Royal Institution, Jan. 10, 1826. 
LX. On 
