MABERY. — ON THE COMPOSITION OF PETROLEUM. 343 



0.7134 grain oil and 16.56 gram benzol gave a depression of 0^.974. 



Calculated for Ci,jIIji. Found. 



222 216.7 



Tiie index of refraction was found to be 1.470, which gave the molec- 

 ular refraction for the formula CioHgQ. 



Calculated for CnjUjo. Found. 



71.6 70.3 



IIydrocakbon C17H30, B. P. 190°-195° (GO mm.). 



Very little difference in specific gravity of this distillate was found 

 before and after purification. The uupurified distillate gave 0.8969, the 

 purified. 08919. The proportions of carbon and hydrogen by combus- 

 tion indicated a change in series from Caii-in-s '^^ the preceding hydro- 

 carbons to C„II.2n_4. 



0.1444 gram of the oil gave 0.4628 gram CO, and 0.1664 HoO. 



Determination of the molecular weight at the freezing point of benzol 

 gave a value for the formula C17H30. 



0.8220 gram of the oil and 18.20 grams benzol gave a depression of 

 0°.921. 



Calculated for C17H30. Found. 



234 240 



The index of refraction was found to be 1.4778, corresponding to the 

 following molecular refraction : 



Calculated for Ci^U.^. Found. 



74.03 74.27 



Hydrocarbon C'lgHsa, B. P. 210^-215° (60 mm.) 



The viscous distillate 210°-21o° had the specific gravity without puri- 

 fication 0.9085, and was not materially changed after thorough treatment 

 with concentrated and fuming sulphuric acid in gasoline solution 0.8996. 

 A combustion gave percentages of carbon and hydrogen rec^uired for the 

 series C„H2q_4. 



