162 Mr. Faraday on the mutual action of sulphuric acid, &c. 
I have not yet obtained sufficient quantities of this salt in 
a decidedly crystalline state to enable me satisfactorily to 
account 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 
materials, to bring the phosphoric acid into solution, but no 
decided 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 
facilitate future reference and description, I may perhaps be 
allowed to suggest that of sulpho-naphthalic acid, which suffi- 
ciently indicates its source and nature without the inconve- 
nience of involving theoretical views. 
Royal Institution, January io, 1826. 
