198 On Sulphuric Acid and Naphthaline. [1826. 



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 grain, 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 two proportionals. 



Carbon. . . 42*40 . 118* approaching to 20 ditto. 



Hydrogen . . 2*66 . 7*4 or 7-4 proportionals. 



102*22 



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 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 mate- 

 rials, 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 sub- 

 stances 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 facili- 

 tate future reference and description, I may perhaps be allowed 

 to suggest that of sulpho-naphthalic acid, which sufficiently 

 indicates its source and nature without the inconvenience of 

 involving theoretical views. 



Royal Institution, January 10, 1826. 



