i62 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 lo, i8z6. 



