MABERY. — COMPOSITION OF PETROLEUM. 273 



In continuing the distillation of the lower fractions nothing came over 

 below 60°, and only in quantities of a few grams below 95°. 



Heptamethylene, C 7 H u . 



The fraction 98°-100° unpurified gave as its specific gravity at 20°, 

 0.7444, and after treatment with fuming sulphuric acid and sodic hy- 

 drate, 0.7414. A combustion of the purified oil gave the following per- 

 centages of carbon and hydrogen : — 



0.1525 grm. of the oil gave 0.4797 grm. C0 2 and 0.1976 grm. H 2 0. 



Calculated for C 7 H 14 . Found. 



C 85.70 85.53 



H 14.30 14.40 



As in the other oils, much benzol was contained in the fractions near 

 80°, and toluol in those near 110°. 



j 



OCTONAPHTENE, C 8 H 16 . 



The fraction 118°-120° gave as its specific gravity unpurified at 20°, 

 0.7632, and after treatment with fuming acid and sodic hydrate, 0.7600. 

 Specific gravity of octonaphtene, 0.7582. This distillate gave after puri- 

 fication, 86.62 per cent of carbon, and 14.60 per cent of hydrogen, 

 which with its boiling point showed it to be octonaphtene. 



To ascertain whether nonane is a constituent of Adams' Canon oil, the 

 distillate 148°-150° was determined, and found to be 0.7858. After 

 treatment with the fuming acid and sodic hydrate its specific gravity was 

 but slightly changed, 0.7800. A combustion then gave 86.10 per cent 

 of carbon, and 13.91 per cent of hydrogen. 



Since nonane requires 84.37 per cent of carbon and 15.63 per cent 

 of hydrogen, it is evident that this hydrocarbon is not a constituent of 

 Adams' Cano'n oil. 



Dekanaphtene, C 10 H 20 . 



The unpurified distillate 158°-160° gave as its specific gravity at 20°, 

 0.7972, and 0.7904 after treatment with the fuming acid and sodic hy- 

 drate. A combustion of the purified oil gave the following percentages 

 of carbon and hydrogen : — 



0.1455 grm. of the oil gave 0.4583 grm. C0 2 and 0.1804 grm. H 2 0. 



Calculated for C ]0 H 20 . Found. 



C 85.70 85.91 



H 14.30 13.78 



VOL. XXXVI. 18 



