MABERY. —THE COMPOSITION OP PETROLEUM. 593 



A combustion gave the following percentages of carbon and hy- 

 drogen : — 



0.1508 grm. of the substance gave 0.4703 grm. CO2 and 0.2032 grra. 

 HoO. 



Calculated for CjsHsg. Found. 



C 85.28 85.07 



H 14.72 14.97 



The molecular weight at the boiling point of benzol corresponded 

 to the formula C23H5g. 



3.070 grms. of the solid hydrocarbon and 26.21 grms. benzol gave a 

 depression of 0°.7538. 



Calculated for CssHjg. Found. 



394 399 



The very thick oil separated by filtration gave as its specific gravity 

 at 20, 0.8694. A combustion gave percentages of carbon and hydrogen 

 required for the series, CnHjn-g. 



0.1500 grm. of the oil gave 0.4729 grm. CO2 and 0.1836 grm. H.O. 



Calculated for Found 



^28^58 CnjU-i; CojHjj. 



C 85.28 85.70 86.02 85.96 



H 14.72 14.30 13.98 13.60 



The molecular weight was found at the boiling point of benzol. 



I. 2.6792 grms. of the oil and 29.85 grra. benzol gave a rise of 0°.5826. 

 II. 1.9196 grms. of the oil and 27.98 grm. benzol gave a rise of 0°.4459. 



Calculated for Found. 



392 396 394.4 



The index of refraction was found to be 1.480, which corresponds to 

 the molecular refractions : — 



Calculated for C^gS^. Found. 



127 126.78 



It will be observed that the two liquid hydrocarbons last described 

 have been shown to belong to a series Caiiia-T Results already ob- 

 voL. XXXVII. — 38 



