Determination of Boiling-points. 259 



fH 6 "| 

 and m nitrosulphotoluolate of baryta, C 14 J SO 2 J-BaSO 4 : the 



details and numerical results of these analyses, and of many 

 others which the present inquiry necessitated, he lim ts and 

 special object of the present paper do not admit of my £vk£ 



a n^l ^ **?«*■** aCld ^ be obtained most i/adTlv by 

 a method which suggested itself to me when working uponthe 

 corresponding term of the benzole series ; by it I have obtained 

 m rosulphox yloh c and -cumolic ac ld s. As benzole IS 



acTd ami ft? Y ' v** ^^ treated ' ^rosulphobenzolic 

 acid and this supposition experiment proved to be correct It 



is not possible to obtain in this way sulphocymolic acid "or the 

 compound C 2 °j N04 j is not yet knowu . this acid may, how- 

 ever, be obtained easily by dissolving sulphocymolic acid in 

 fuming nitric add The salts of these° nitrosulpho-acids^efla 

 grate when heated ; m the case of the barium compounds the 

 residual sulphate of baryta assuming the form of long "narrow 



Bases prepared from impure hydrocarbons of the benzole 

 series give, on analysis, results tolerably accordant with theoiT 

 this circumstance, if not entirely accounted for by the numerous 

 processes of purification which these bases undergo, is exSa ned 

 when we recollect the recent researches of C.°G. Sams* 

 Un the Fractional Crystallization of Platinum Saltst.' 

 Many subjects for further investigation have su-gested them 

 selves to me during the progress of^he present inqt uy am" 

 these the subject of isomers is of great interest. The imrTtanf 

 observations, too, of Regnault and others as to the alteXns Tn 

 their boiling-points which many liquids undergo when heated 

 under pressure I have found to refer to benzole, &c, on this 

 account, in purifying these liquids, I was obliged to desist from 

 digesting them m sealed tubes. A digestio? of toluo e ith 



tTouTtwnl C \ 0Sed rfJ° r a f ° ltni 8 lt Causes ** e nnma- 

 01 of two bodies, the boiling-point (97°) of one being interme- 



ittSrairfiJ b T°/ e and > toluoIe ' the h ^-mZf 



1 tT ( , A } , bem ? betwecn those of tol «ole and xylole 

 And I have lately found, that among the products of the distit 

 latum of eugenic acid with an excess of baryta, a liquid occurs 

 for which my experiments (not made with a per ectl pu \c sub 

 stance) indicate a formulaC 18 H< 2 ; forC 2 0H 12 O^C 2 O 4 £c'811'( 

 • Phil. Uaffi Sept. 1854. 



Mai A ^TSo ) ';!: t ::7 atl01,S °? '''r WlUn ^^ of certain bases (Phil. 

 "iaf,. i to. woo) are also exoeedmgly curious 



S2 



