162 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 0.1656 gram of the oil gave 0.5156 gram CO2, and 0.2241 gram 

 H2O. 

 II. 0.1736 gram of the oil gave 0.5419 gram CO2, and 0.2345 gram 

 H2O. 



Calculated for Found. 



C10H22. 1. II. 



C 84.51 84.90 85.13 



H 15.49 15.04 15.01 



The specific gravity of this distillate was found to be 0.7618, the 

 same as that purified by fuming sulphuric acid. Another portion of 

 the same crude distillate vs^as treated with the mixture of concentrated 

 nitric and sulphuric acids. The great heat developed was controlled by 

 cooling, and finally the heavy nitro product collected above the acid. 

 25 grams of the crude distillate lost 9 grams in the formation of the 

 nitro product, equivalent to 36 per cent. In another experiment 25 

 grams of the crude distillate treated with fuming sulphuric acid lost 6 

 grams, or 24 per cent. The oil remaining after the first experiment was 

 again treated with the mixture of acids, which caused further separation 

 of the nitro product. For the removal of the nitro compound, the oil 

 was boiled during several hours with tin and hydrochloric acid. The 

 reduction was very slow and a red oil separated, leaving the upper layer 

 colorless. The latter was then agitated with concentrated sulphuric acid, 

 washed, dried, and analyzed : — 



0.1449 gram of the oil gave 0.4494 gram CO2, and 0.2051 gram HjO. 



Calculated for CjoHoj. Found. 



C 84.51 84.57 



H 15.49 15.73 



The oily nitro derivative of the aromatic hydrocarbon deposited crys- 

 tals on standing, which after recrystallization from hot alcohol, in which 

 it was very sparingly soluble, melted at 169°. The quantity obtained 

 was insufficient for analysis. 



The specific gravity of the oil purified as described above was 0.7601, 

 and, as shown by the vigorous means of purification employed, it cannot 

 easily be reduced, although it is materially larger than the specific grav- 

 ity of the decane 173° separated from Ohio oil, 0.7513, and of the 

 decane from Pennsylvania oil, 0.7467. But the analyses show that the 

 principal constituent is a hydrocarbon of the series C„H2„ + 2- The 

 molecular weight of this hydrocarbon, determined by the Beckmann 

 method, gave Mr. Hudson 144 ; required by the formula C10H22, 142. 



