MABERY. — COMPOSITION OP PETROLEUM. 265 



and still further by the composition of the monochlornaphtene obtained 

 from the hydrocarbon boiling at 195°, which gives as its formula 

 C n H 21 Cl. 



In the vicinity of 200°, 50 grms. of a distillate collected which gave 

 as its specific gravity 0.8684. After agitation with fuming sulphuric 

 acid, the specific gravity was diminished to 0.8202. An analysis before 

 treatment gave 87.84 per cent of carbon and 11.91 per cent of hydrogen. 

 After treatment with the acid, the analysis gave 85.99 per cent of carbon 

 and 13.97 per cent of hydrogen, showing that some of the aromatic 

 hydrocarbon still remained ; the small amount of naphtene was doubt- 

 less undekanaphtene, boiling at 195°; specific gravity, 0.8010, as given 

 above. 



DODEKANAPHTENE, Ci 2 H 24 . 



A considerable quantity of distillate collected at 208°-210°, correspond- 

 ing to 216°, which corresponded in composition by analysis and molec- 

 ular weight to dodekanaphtene : — 



0.1496 grm. of the oil gave 0.4677 grm. C0 2 and 0.1962 grm. H 2 0. 



Found. 



85.26 

 14.57 



Determinations of the molecular weight of this product by the Beck- 

 man method at the freezing point, gave results corresponding to the for- 

 mula of dodekanaphtene. 



1.0141 grm. of the oil and 25.61 grms. benzol gave a depression of 1.17. 



Calculated for C,,n M . Found. 



166 166 



It is therefore evident that California petroleum differs from Russian 

 oil in containing dodekanaphtene, boiling at 216°, as well as undecanaph- 

 tene, boiling at 195°. 



Pcente Oil. 



The specimen received from the Puente Oil Company was somewhat 

 thicker than the Fresno oil. Its specific gravity at 20° was found to 

 be 0.892. It contained 0.80 per cent of sulphur. Two determinations 

 of nitrogen by the Kjeldahl method gave, (I.) 0.564, (II.) 0.587 ; and 

 by the absolute method, measuring the volume of nitrogen, (I.) 1.18, and 



