CONTRIBUTIONS FROM THE CHEMICAL LABORATORY OF 

 CASE SCHOOL OF APPLIED SCIENCE. — XLL 



THE COMPOSITION OF PETROLEUM. 



By Charles F. Mabery. 



ON THE HYDROCARBONS IN PENNSYLVANIA PETROLEUM 

 WITH BOILING POINTS ABOVE 216°. 



Received March 24, 1902. Presented April 9, 1902. 



In a former paper* the principal hydrocarbons in Pennsylvania, 

 Ohio, and Canadian petroleum below 216°, were shown to have the 

 composition represented by the general formula CnHgn + a- Concern- 

 inor the constituents with higher boiling points very little is known. 

 Pelouze and Cahours f collected distillates to which they gave the fol- 

 lowing formulas : — 



216°-218° 236°-240° 255°-260° 280° 



C13H28 C14H30 U15H32 C16H34 



From paraffiue the following hydrocarbons have been separated (Beil- 

 stein's Handbook) : — 



212°-215° 230°-235° 252°-255° 273°-275° 



C13H28 ^14^130 ^15 "32 ^leHsi 



So far as I am aware, these are the only allusions to the composition 

 of Pennsylvania petroleum in these portions. It appears that the dis- 

 tillations were made under ordinary atmospheric pressure in presence 

 of air with no attempts to avoid decomposition under these conditions. 



Then, furthermore, as I have suggested in a former paper, the high 

 specific gravity of the distillates separated by Pelouze and Cahours 

 indicate that their distillates were obtained from Canadian petroleum. 

 It does not appear that any attempts have been made to ascertain the 

 molecular weights of the individual hydrocarbons. Indeed this has been 



* These Proceedings, XXXII. 12L 

 t Ann. China. Phys. (4), 1, 5 (1864). 



