1826.] and Naphthaline, and on a new Acid produced, 213 



On these data, 100 grains of the salt would yield 329*3 cubic 

 inches of carbonic acid, or 153*46 grains, equivalent to 41*9 

 grains of carbon, and 25*89 grains of water, equivalent to 2*877 

 grains of hydrogen. Hence 100 grains of the salt yielded 



Baryta 27-57 78*0 



Sulphuric acid 30-17 85*35 



Carbon 41-90 118-54 



Hydrogen 2-877 8-13 



102-517 



In the second numerical column the experimental results are 

 repeated, but increased, that baryta might be taken in the 

 quantity representing one proportional, hydrogen being unity : 

 and it will be seen that they do not differ far from the following 

 theoretical statement: 



Baryta 1 proportional 78 



Sulphuric acid 2 ditto 80 



Carbon 20 ditto 120 



Hydrogen 8 ditto 8 



The quantity of sulphuric acid differs most importantly from 

 the theoretical statement, and it probably is that element of the 

 salt, in the determination of which most errors are involved. 

 The quantity of oxide of copper and of acids required to be 

 used in that part of the analysis, may have introduced errors, 

 affecting the small quantity of salt employed, which when mul- 

 tiplied, as in the deduction of the numbers above relative to 100 

 parts, may have created an error of that amount. 



As tbere is no reason to suppose that during the combination 

 of the acid with the baryta any change in its proportions takes 

 place, the results above, minus the baryta, will represent its 

 composition ; from which it would appear, that one proportional 

 of the acid consists of two proportionals of sulphuric acid, 

 twenty of carbon, and eight of hydrogen ; these constituents 

 forming an acid equivalent in saturating power to one propor- 

 tional of other acids. Hence it would seem, that half the sul- 

 huric acid present, at least when in combination, is neutralized 

 y the hydro-carbon ; or, to speak in more general terms, that 

 the hydro-carbon has diminished the saturating power of the 

 sulphuric acid to one-half. This very curious and interesting 

 fact in chemical affinity was however made known to me by 

 Mr. Hennell, of Apothecaries' Hall, as occurring in some other 

 compounds of sulphuric acid and hydro-carbon, before I had 

 completed the analysis of the present acid and salts ; and a 

 similar circumstance is known with regard to muriatic acid, in 

 the curious compound discovered by M. Kind, which it forms 

 with oil of turpentine. Mr. Hennell is, I believe, on the point 



I 



