MABERY. — CONSTITUENTS OF PETROLEUM. 147 



Normal Decanl, B. P. 173°-174°. 



Above 162° (730 mm.), the distillates were small to 16S°. After long 

 continued distillation, 300 grams collected at 169°-170° (730 mm.), which, 

 without further purification, except drying over sodium, gave the follow- 

 ing percentages of carbon and hydrogen : — 



I. 0.1434 gram of the oil gave 0.4486 gram COo, and 0.1927 gram H2O. 

 II. 0.1577 gram ofthe oil gave 0.4948 gram C02,and 0.2070 gram HoO. 



Found. 



I. n. 



85.33 85.55 



14.94 14.58 



A determination of the specific gravity of this distillate gave 0.7621, a 

 value considerably higher than that of the corresponding unpurified Penn- 

 sylvania distillate, 0.7502. 



0.1670 gram of the oil gave 79 c.c. of vapor at 182", under a tension of 

 366 mm. 



Calculated for CiqHjj. Found. 



4.90 5.15 



A portion of the crude distillate was shaken with concentrated sul- 

 phuric acid, washed, and dried for analysis ; — 



0.1504 gram of the oil gave 0.4708 gram CO2, and 0.1984 gram H2O. 



C 85.37 



H 14.67 



The specific gravity of this oil after treatment with sulphuric acid was 

 somewhat lower than that of the crude distillate, 0.7580. A determina- 

 tion of its vapor density gave 5.02. The fraction 169°-170°, Ohio oil, 

 was the first to be submitted to the action of the mixture of nitric and 

 sul phuric acids. When a small quantity of the oil was heated to about 1 25° 

 during 24 hours with the acid mixture, nitrous fumes were freely evolved 

 and the volume of the oil gradually diminished until very little remained. 

 Upon diluting the acid, a heavy, tarry mass was precipitated, evidently a 

 product of decomposition of the hydrocarbon. In another experiment, 

 25 grams of the crude distillate were agitated in the cold with the acid 

 mixture, separated from the acid and the oily nitro product, washed, and 

 dried. After boiling with sodium and shaking with sulphuric acid, there 



