40 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 0.2083 gram of the oil gave 0.6423 gram CO^, and 0.2849 

 gram II2O. 

 II. 0.2010 gram of the oil gave 0.6200 gram CO2, and 0.2744 

 gram H^O. 



Required for - Fouud. 



C7H1G. CjHi^. I. II. 



C 84.00 85.71 84.09 84.72 



H 16.00 14.28 15.27 15.17 



This oil was evidently heptane contaminated, as shown by the low 

 percentage of hydrogen, by a hydrocarbon containing less hydrogen. 

 To remove any doubt as to the presence of heptane, the oil was heated 

 during fifteen hours with a mixture of nitric and sulphuric acids, the 

 oil separated from the acid, washed, dried, and boiled for some time 

 with sodium. It was then distilled from the large amount of colored 

 residue, again boiled with sodium, and distilled. The last distillation 

 left very little residue, and the distillate was nearly odorless. The 

 residue from the treatment with sodium crystallized well from alcohol. 

 Upon diluting the acid a heavy nitro product separated in consider- 

 able quantities. A combustion of the purified oil gave the following 

 percentages of carbon and hydrogen : — 



0.1410 gram of the oil gave 0.4224 gram of CO2, and 0.2065 gram 

 H2O. 



Required for CjHjg. Found, 



C 84.00 83.75 



H 16.00 16.28 



In a distillate 95°-100° from American ligroine, Beilstein and 

 Kurbatoif * found 84.8 per cent of carbon and 15.4 per cent of hydro- 

 gen. After prolonged heating with nitric acid, the oil distilled at 

 98°. 5 — 99°. 5, and gave on analysis 84.2 per cent of carbon and 15.9 

 per cent of hydrogen, from which it was inferred that hydrocarbons 

 poorer in hydrogen were contained in the crude ligroine. A nitro 

 derivative was separated from this fraction with the composition of 

 nitropropane, C7Hi5N02. The fraction from Ohio petroleum gave no 

 nitro compound when treated with nitric acid, and the acid was diluted. 



Scarcely any residue remained when the oil was distilled after the 

 treatment with acid. With a mixture of nitric and sulphuric acids, as 

 shown above, much nitro compound separated upon dilution, which was 



* Ber. der deutsch. chem. Gesellsch., 1880, p. 2028. 



