a new Hydrocarbon from Coal-naphtha. 417 



fusing-point of dinitrobenzole has, I believe, never been accu- 

 rately ascertained. Gerhardt states that it is under 100° C. 

 According to my determinations, the fusing-point of dinitro- 

 benzole crystallized from alcohol is 85°"5, and the solidifying- 

 point 83°'o ; but on repeating the experiment with a preparation 

 purified by recrystallization from water, I found the fusing-point 

 to be 88°, and the solidifying-point 86°. 



The original hydrocarbon left in contact with Nordhausen 

 sulphuric acid for some days, perfectly dissolves with the produc- 

 tion of a reddish colour. Four volumes of sulphuric acid were 

 employed for each volume of parabenzole. If the solution be 

 thrown into water the colours disappear, and an acid which 

 yields a soluble baryta-salt is found in the liquid. This baryta- 

 salt is deposited only when the solution has reached a very con- 

 siderable degree of concentration, and exhibits traces only of 

 crystalline structure. It is almost insoluble in dry ?ether, very 

 slightly soluble in absolute alcohol. It may be purified by 

 washing with aether (whereby a yellow colouring matter is re- 

 moved), and solution in dilute alcohol. An analysis gave the 

 following numbers : — 



•434 grm. of salt gave 'SSIS grm. sulphate of baryta. 



This corresponds to 51'03 per cent, of sulphate of baryta. 



The formula C'^ H5Ba2S03 requires 51-22 p. c. of BaSO* 

 C'4H"Ba2S03 ... 48-65 

 Experiment gave . . . 51-03 



Thus there is no doubt, that although the boiling-point of the 

 original hydrocarbon is much nearer that of toluole than that 

 of benzole, yet the new substance is really an isomer of the 

 latter body. The copper-salt of the sulpho-acid, prepared by 

 precipitating the baryta-salt with sulphate of copper, is exceed- 

 ingly soluble in water, and unlike the beautiful sulphobenzolate 

 of copper, requires the microscope to show that it possesses a 

 crystalline structure, for it is not without action on polarized 

 light. 



The copper-salt, treated with sulphuretted hydrogen, deposits 

 brown sulphide of copper j and when filtered from this and heated 

 to separate sulphuretted hydrogen, the solution contains an acid 

 giving no precipitate with carbonate of baryta, but dissolving it 

 abundantly, becoming neutral, and yielding on evaporation the 

 original bai^ta-salt, but in a state of perfect purity. 



The sulpho-acid crystallizes from its aqueous solution when 

 evaporated in vacuo over sulphuric acid in small prisms, very 

 slightly if at all deliquescent. It is pleasantly sour, with a bitter 

 after-taste. It dissolves metallic oxides, yielding salts : that of 

 ammonia is very soluble in water and alcohol, insoluble or nearly 



