MABERY. — THE COMPOSITION OP PETROLEUM. 591 



0.1534 grm. of the substance gave 0.4787 grm. CO2 aud 0.2006 grm. 

 H2O. 



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 C25H52. Found. 



352 353.4 



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



HeXACOSANE, C26H54, AND LiQUID HYDROCARBON, C27H52. 



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. COo and 0.2033 grm. 

 H.,0. 



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



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

 0°.416. 



Calculated for C26Hg4. Found. 



366 364 



