MABERY AND SHEPHERD. SOLID HYDROCARBONS. 285 



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A 



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This method was applied to the determination of tlio index of refrac- 

 tion of hydrocarbons separated from Pennsylvania petroleum direct as 

 described by one of us (Mabery) in a former paper, * and also to the 

 same hydrocarbons separated from conmiercial parafTnie. The bodies 

 from crude petroleum had been distiiU'd many times under a tension of 

 50 mm. and separated from the li(|uid hydrocarbons by coolin<j to a low 

 temperature, pressing out the liquid hydrocarbon, and crystallizatiou of 

 the solids from ether and alcohol. 



* These Proceedings, XXXII. 365 (I'JO'J). 



