MABERY. — ON THE COMPOSITION OP PETROLEUM. 331 



The index of refraction found, 1.4G5, also confirmed the same formula: 



Calculated for €211140. Found. 



94.56 94.45 



HrDROCARBON C22H42, B. P. 224°-227° (30 mm.). 



22 grams collected after the tenth distillation at 224°-227°, whose 

 specific gravity was found to be 0.8480 at 20°. After filtration at —10° 

 and treatment with acid in gasoline solution, the specific gravity was 

 raised to 0.8614. A combustion gave percentages of carbon and hydro- 

 gen requii-ed for the series CnHjn-s- 



I. 0.1403 gram of the oil gave 0.4438 gram CO., and 0.1 G70 gram H.O. 

 II. 0.1571 gram of the oil gave 0.4970 gram CO., and 0.1901 gram HoO. 



The molecular weight determined at the freezing point of benzol 

 corresponded to the formula C22H42. 



0.8385 gram of the oil and 21.6023 grams benzol gave a depression of 

 0°.602. 



Calculated for C,,!!^. Found. 



306 309 



This formula was still further confirmed by the molecular weight 

 determined at the boiling point of benzol, which gave 310. 



Tlie index of refraction, 1.4690, supported the same formula, as shown 

 by the corresponding molecular refraction : 



Calculated for 0221142- Found. 



99.16 99.60 



Hydrocarbon C24H46, B. P. 237°-240° (30 mm.). 



The hydrocarbon CosHji did not appear in the small amount of distil- 

 lates between 227° and 235°. Within the limits 237°-240°,-30 mm., 

 40 grams collected which was solid with paraffine at ordinary tempera- 

 tures. After filtration at — 10° the thick viscous oil gave as its specific 

 gravity 0.8639. A combustion gave percentages of carbon and hydrogen 

 required for the series CnH2n_2. 



