MABERY. — COMPOSITION OF PETROLEUM. 271 



0.7756, after treatment with the fuming acid. Its composition after 

 treatment with the acid corresponded to that of C„H2,j : — 



O.U34: grm. of the oil have 0.4480 grm. COg and 0.1839 grm. HgO. 



Calculated for C„H2„. Found. 



C 85.70 85.20 



H 14.30 14.25 



The lower specific gravity of nonane and the results of analysis show 

 that nonane is not a constituent of this oil. 



Dekanaphtene, CioHgo- 



The specific gravity of the unpurified fraction 160°-1G2° at 20° was 

 0.7966, and after purification with fuming sulphuric acid and sodic 

 hydrate was 0.7905 (C10H20, 0.7950 at 0° MarkownikofF). 



It gave the following results on analysis : — 



I. 0.1471 grm. of the oil gave 0.4625 grm. CO.2 and 0.1907 grm. HoO. 

 II. 0.1475 grm. of the oil gave 0.4477 grm. CO2 and 0.1813 grm. HoO. 



On account of the small amount of the distillate 167°-170°, no 

 examination was made of it. It was doubtless chiefly a benzol 

 homologue. 



Fraction 176°-178. 



To ascertain whether a naphtene boiling at 182° is present in this oil, 

 the fraction 17G°-178° was treated thoroughly with fuming sulphuric 

 acid and sodic hydrate. Its specific gravity before treatment was 0.8116 ; 

 after treatment, 0.7955. It gave on analysis 86.01 per cent carbon and 

 13.31 per cent hydrogen, indicating still the presence of a benzol homo- 

 logue. But the small quantity remaining showed the absence of any 

 other constituents with this boiling point in this distillate. 



Undekanaphtene, Cnll22. 



The fraction 190°-194° gave 0.8186 as its specific gravity before 

 treatment with fuming sulphuric acid and sodic hydrate, and afterward, 

 0.8046. IMarkownikoff found 0.8119 at 0° as the specific gravity of 

 dodekanaphtene from Baku oil. 



