MABERY. — THE COMPOSITION OF PETROLEUM. 591 



0.1534 grm. of the substance gave 0.47S7 grin. CO., and 0.2006 grin. 

 ILO. 



A determination of its molecular weight verified the formula : — 



1.7583 grm. of the substance, and 24.39 grms. benzol gave by the 

 boiling point method a rise of 0°.5231. 



Calculated for C 25 H 52 . Found. 



352 353.4 



Melting point of the solid hydrocarbon, 53° -5 4°. 



Hexacosane, C 26 H 54 , and Liquid Hydrocarbon, C 27 H C2 . 

 From Distillate 292°-294°, 50 mm. 



After the fifteenth distillation, 100 grams collected at 292°-294°, 

 50 mm., which deposited a considerable quantity of solid crystalline 

 hydrocarbon. These crystals were filtered, pressed, and purified by 

 crystallization from ether and alcohol. Melting point, 58°. The 

 specific gravity of this hydrocarbon was determined as follows : — 



60°, 0.7977 70°, 0.7956 80°, 0.7943 



A combustion of the solid gave the following percentages of carbon 

 and hydrogen : — 



0.1508 grm. of the substance gave 0.4709 grm. C0 2 and 0.2033 grm. 

 H 2 0. 



Calculated for C^H^. Found. 



C 85.24 85.17 



H 14.76 14.98 



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



1.2754 grm. of the substance and 24.2827 grms. benzol gave a rise of 

 0°.416. 



Calculated for C 2S H M . Found. t 



366 364 



