MABERY. — SULPEUR PETROLEUMS. 59 



nitrobenzol was recognized by conversion into aniline, which gave its 

 characteristic reaction with furfurol. 



Toluol. 



In the portions containing tohiol, between 107" -109° after the 

 eighth distillation, the distillates amounted to 40 grams, at 109°-111° 

 to 250 grams, and at 111°-113° to 50 grams. Theae fractions were 

 treated for the formation of uitrotoluol in the same manner as those 

 previously examined, and the fraction 109°-lir gave a weight of 

 unaffected hydrocarbon and nitro product equivalent to five per cent 

 of toluol in the fraction 107°-109° one per cent, and in the fraction 

 111°-113° one per cent. The higher and lower fractions gave no 

 nitrotoluol. Referred to the total weights of the fractions, the quan- 

 tity of toluol was 3.4 grams, equivalent to 0.005 per cent of the total 

 weight of crude oil taken. As in the case of benzol, it is probable 

 that the quantity of toluol is somewhat larger than is shown by these 

 determinations. This product was shown to be toluol by conversion 

 of the nitro derivative into toluidine, which gave characteristic color 

 reactions. 



Xylols. 



The single allusion to the presence of xylols in Canadian petroleum 

 is a general statement by Schorlemmer that he obtained reactions for 

 benzol and its homologues, although the only aromatic hydrocarbon he 

 separated was cumol in the form of the trinitro derivative. 



After prolonged distillation, having found that fractions collected 

 within limits corresponding to the boiling points of the xylols, we have 

 spent considerable time in the formation of characteristic compounds 

 as adequate evidence of their presence in the crude oil. In the 

 twentieth distillation, within one degree after the twelfth, the foUow- 

 iucr weights collected between 136° and 143° : — 



136=-137^ 137=-138= 138^-139= 139'-140^ 140^-141° 141''-142^ 142^-143° 



Grams 30 40 25 40 25 47 30 



On account of the close proximity of the xylols in boiling points, it 

 would evidently require much longer time in distillation and larger 

 quantities of the distillates to separate them completely. We there- 

 fore depended upon the formation of derivatives that are sufficiently 

 well characterized to warrant conclusions concerning the xylols from 

 which they were formed. As a qualitative test for paraxylol, a part 

 of the fraction 137°-138° was heated with nitric and sulphuric acids, 



