MABERY. — ON THE COMPOSITION OF PETROLEUM. 339 



The same formula was confirmed by the molecular refraction, calculated 

 from the index found, 1.452. 



Calculated for CijUjo. FounJ. 



69.04 09.15 



A portion of this hydrocarbon was chlorinated, and the product dis- 

 tilled until it came together in large amount at 190°, 15 mm. Its specific 

 gravity at 20° was found to be 0.9358. Determinations of chlorine es- 

 tablished its composition. 



I. 0.1579 gram of the substance gave 0.0951 gram AgCl. 

 II. 0.2032 gram of the substance gave 0.1158 gram AgCI. 



CI 



For further identification the molecular weight of the chloride was 

 ascertained. 



0.4520 gram of the substance and 17.44 grams benzol gave a depression 

 of 0°.529. 



Calculated for CisHjgCl. Found. 



244.5 240 



The index of refraction found, 1.455, corres2Donded to a molecular 

 refraction of the same formula : 



Calculated for CisHoqCI. Found. 



73.99 74.83 



It would have been interesting to include in this examination the 

 hydrocarbons with still higher boiling points to ascertain where the 

 series CnH2n_2 and CnH2n_4 begin, for comparison with the corresponding 

 distillates trom other petroleum. But the work described above ex- 

 hausted the supply of distillates prepared from the large distillation of 

 crude oil, and the great amount of labor involved in working up to the 

 well distilled fractions from the crude oil prevented a repetition on 

 account of the attention demanded by more important lines of work. 



The hydrocarbons described above, representing considerable propor- 

 tion of Canadian petroleum, correspond in boiling points and in composi- 

 tion to those separated from Ohio Trenton limestone petroleum. An 

 explanation of the higher specific gravity of Canadian crude oil and 

 commercial products obtained from it over Ohio, Pennsylvania, West 



