MABERY AND GOLDSTEIN. — SPECIFIC HEATS OF HYDROCARBONS. 549 



Boiling Point. Heat of Vaporization in Calories. 



o 



Hexane, C 6 H 14 68 79.4 



Heptane, C 7 H 1(J 98 74. 



Octane, C 8 H 18 125 71.1 



Determinations were also made on the methylene hydrocarbons that 

 could be volatilized in this form of apparatus : 



Hexamethylene, C 6 H 12 

 Dimethylpentamethylene, C 7 H U 

 Methylhexamethy lene, C 7 H 14 

 Dimethylhexamethylene, C 8 'H 16 



These results indicate a rapid falling off in latent heat, with increase 

 in molecular weight. It is to be regretted that we had not the metallic 

 condenser, which would have enabled us to carry these observations up 

 to include the less volatile hydrocarbons of both series. Advantage will 

 be taken of the earliest opportunity to continue this work. 



The hydrocarbons used in the work described in this paper were pre- 

 pared with assistance granted by the Academy from the C. M. Warren 

 Fund for Chemical Research. 



