MABERY. — COMPOSITION OF PETROLEUM. 267 



specific gravity of heptauaphtene, 0.742 at 18°. Analysis I. was made 

 of the untreated oil, analysis II. of the portion after treatment: — 



I. 0.1409 grm. of the oil gave 0.4438 grm. C0 2 and 0.1683 grm. H 2 0. 

 II. 0.1396 grm. of the oil gave 0.4383 grm. C0 2 and 0.1792 grm. H 2 0. 



Calculated for Found. 



C 7 H 14 . I. II. 



C 85.70 85.90 85.60 



H 14.30 13.27 14.26 



The difference in analysis I. is doubtless due to oxygen and nitrogen 

 compounds, since agitation of the crude distillates with potassic hydrate 

 separates from most of the distillates from California petroleum heavy 

 oils, with an odor resembling that of creosote. A description of these 

 oxygenated compounds is reserved for a later paper. The specific 

 gravity of the purified fraction, 0.7440, is essentially the same as that 

 of heptauaphtene separated from Russian oil, 0.748, by Beilstein and 

 Kurbatoff. 



OCTONAPHTENE, C 8 H 16 . 



The fraction 11 8° -120°, without further treatment, gave as its specific 

 gravity at 20°, 0.7615, which was reduced to 0.7540 by agitation with 

 fuming sulphuric acid. Specific gravity of octonaphtene, 0.7552 at 

 17°.5. Analysis I. was made of the crude distillate, and analysis II. of 

 the oil after purification with the acid. 



I. 0.1406 grm. of the oil gave 0.4424 C0 2 and 0.1760 grm. H 2 0. 

 II. 0.1503 grm. of the oil gave 0.4692 grm. C0 2 and 0.1941 grm. H 2 0. 



Calculated for Found. 



C 8 H l6 . I. II. 



C 85.70 85.81 85.20 



H 14.30 13.91 14.35 



No further examination was made of the fractions from 120° to 

 148°, but it seemed of interest to ascertain whether nonane formed any 

 part of the distillate 148°-150°, since it forms such a large proportion 

 of the Eastern oils. The crude distillate 150°-151° gave as its specific 

 gravity 0.7910, and after purification with sulphuric acid, 0.7730. 

 Analysis of the treated oil gave percentages of carbon and hydrogen 

 that still showed the presence of the benzol homologue. 



