456 Mr. A. H. Church on some Derivatives of Xylole. 



requires 27*02. The sulphuric acid used in the preparation of 

 this sulpho-acid had acquired a reddish -yellow tint, and gave 

 after neutralization with carbonate of barium, filtration and eva- 

 poration, a second portion of sulphoxylolate of barium. Of this 

 salt "5001 gnu. gave '2287 grm. of sulphate of barium, corre- 

 sponding to 2701 per cent, of barium ; calculation as C 16 H 9 

 Ba2S0 3 requires 27*02 per cent. 



Sulphoxylolate of barium crystallizes in pearly scales similar 

 to those of sulphotoluolate of barium • if to its hot concentrated 

 aqueous solution cold water be added, I have occasionally found 

 the salt separate in beautiful iridescent plates. The aqueous 

 solution is not altered by ebullition. 



I append the analytical results of those experiments relating 

 to pure toluole (boiling at 103*7), spoken of in my former note 

 on the benzole series. The nitro-sulphotoluolic and sulphoto- 

 luolic acids were obtained in the same manner as the correspond- 

 ing terms of the xylole series. The determinations of sulphate 

 of barium were made by ignition of the barium compounds with 

 the precautions previously mentioned. 



I. Analysis of toluole. 



•4024 grm. of oil gave "3151 grm. of water and 1*3450 grm. 

 of carbonic acid. 



These numbers correspond to the following per-centage com- 

 position : — 



II. Determination of barium in nitro-sulphotoluolate of 

 barium. 



•3022 grm. of salt gave *1289 grm. of sulphate of barium, 

 corresponding to 25 per cent, of barium; theory as C 14 H 6 N0 4 

 Ba 2S0 3 requires 24*41 per cent.* 



III. Determination of barium in sulphotoluolate of barium. 



•705 grm. of salt gave *349 grm. of sulphate of barium, cor- 

 responding to 29*14 per cent, of barium ; theory asC l4 H 7 Ba2S0 3 

 requires 29*08 per cent. 



Ma)- 1855. 



* The excess of barium given by experiment over that required by 

 theory arose from a slight admixture of nitrate of barium with the original 

 salt. 



