MABERY. COMPOSITION OF PETROLEUM. 299 



constituents. A combustion of Amaze crude oil gave 84.66 per cent 

 carbon and 13.22 per cent hydrogen. After several distillations under 

 a Hempel column, fractions collected in larger quantities at 68°, 98°, 

 119°, 135°, 62°, 96°, 216°. No attempts were made to ascertain the 

 form of the hydrocarbons below 68°. The distillate collected at 68° 

 gave as its specific gravity 0.7343, which indicated that hexane was not 

 present in any considerable quantity. But nothing further was done 

 toward identifying hexamethylene, which no doubt is the principal 

 hydrocarbon in this distillate. 



The distillate collected at 98° -100°, after purifying with fuming sul- 

 phuric acid, gave as its specific gravity at 20°, 0.7450. 



A combustion gave the following percentages of carbon and hydro- 

 gen : — 



0.1347 grm. of the oil gave 0.4221 grm. C0 2 and 0.1721 grm. H 2 0. 



Calculated for C-H,,. Found. 



C 85.70 85.45 



H 14.30 14.20 



Its index of refraction was found to be 1.4174, and the molecular 

 refraction, 33.14; calculated for C 7 IIi 4 , 32.22. This hydrocarbon was 

 therefore methylhexamethyleue. 



The distillate 118°-120 r , after purification with fuming sulphuric 

 acid, gave 0.7621 as its specific "gravity at 20°. A combustion gave the 

 following percentages of carbon and hydrogen : — 



0.1406 grm. of the oil gave 0.4378 grm. C0 2 and 0.1812 grm. H 2 0. 



Calculated for C 8 H Il3 . Found. 



C 84.70 84.94 



H 14.30 14.33 



A determination of the index of refraction of this oil gave 1.4256, and 

 the molecular refraction, 37.68 ; calculated for C 8 H 16 , 36.82. This 

 hydrocarbon was therefore dimethylhexamethylene. 



The distillate collected at 134°-135° was purified with fuming sul- 

 phuric acid and analyzed. 



0.1528 grm. of the oil gave 0.4805 grm. C0 2 and 0.1950 grm. H 2 0. 



Calculated C H 13 . Found. 



C 85.70 85.76 



H 14.30 14.29 



