MABERY. — ON THE COMPOSITION OF PETROLEUM. 353 



from ether and alcohol its specific gravity was 0.8005 at 75"^. Melting 

 point of the purified hydrocarbon, 68^-70°. The unpurified distillate 

 gave percentages of carbon and hydrogen corresponding to the series 



0.1517 gram of the substance gave 0.4784 gram CO.j and 0.1 850 gram II._,0. 



Calculated for C^oU^. Found. 



C 86.12 86.06 



H 13.88 13.64 



The purified solid gave projiortions of carbon and hydrogen required 

 for the series CnH2n+2- 



0.1544 gram of the solid gave 0.4816 gram CO.. and 0.2060 gram H.,0. 



Calculated for C^oUgg. Found. 



C 85.33 85.06 



H 14.67 14.92 



The molecular weight as determined by the boiling point method 

 confirmed the formula CaoIIcc. 



0.5127 gram of the substance and 12.23 grams benzol gave a depression 

 of 0°. 654. 



Calculated for Cj^Hq,;. Found. ^- 



438 442 



As mentioned above, the solid hydrocarbons form a small proportion 

 ■)f the original oil, and the small amounts that collect at 328°-330° and 

 340°-342° have doubtless nearly the same composition, CsoHqq. 



The distillate 366°-368°, 50 mm., before treatment, had the specific 

 gravity 0.8312, and the solid hydrocarbon separated by freezing, filtra- 

 tion, and crystallization from ether and alcohol, the specific gravity at 

 80°, 0.8009. The purified solid melted at 71°-72°. The proportions 

 of carbon and hydrogen in the unpurified distillate corresponded to the 

 formula C„H.2„_2. 



0.1485 gram of the substance gave 0.4982 gram COj and 0.1851 gram 



Found. 



85.96 

 13.94 



