MABERY. COMPOSITION OP PETROLEUM. 271 



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

 treatment with the acid corresponded to that of C„H 2;t : — 



0.1434 o-rm. of the oil have 0.4480 grm. C0 2 and 0.1839 grm. H 2 0. 



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

 that nonane is not a constituent of this oil. 



Dekanaphtene, C 10 H 20 . 



The specific gravity of the unpurified fraction 1G0°-162° at 20° was 

 0.7966, and after purification with fuming sulphuric acid and sodic 

 hydrate was 0.7905 (C 10 H 20 , 0.7950 at 0° Markownikoff) . 



It gave the following results on analysis : — 



I. 0.1471 grm. of the oil gave 0.4625 grm. C0 2 and 0.1907 grm. H 2 0. 

 II. 0.1475 grm. of the oil gave 0.4477 grm. C0 2 and 0.1813 grm. H 2 0. 



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, C n H 22 . 



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

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

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

 dodekanaphtene from Baku oil. 



