302 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Determinations by the boiling point method of hydrocarbons vvitli such 

 high molecular weights are of necessity somewhat uncertain on account 

 of the slight rise in boiling point. The question of the molecular weights 

 of these solid hydrocarbons will receive more attention with the constitu- 

 ents of Pennsylvania and California petroleums with high boiling points. 



The specific gravity of the solid 250°-260° is nearly the same as that 

 of the corresponding hydrocarbon from Pennsylvania petroleum : — 



The specific gravity of the Japanese solid at 60° could not be deter- 

 mined, because it was not liquid at that temperature. 



MiTAGAWA Petroleum. 



Althougli this oil is from a field situated only six miles from the 

 Amaze field, it differs essentially in its specific gravity, and in the pro- 

 portions in which it distils, from the Amaze oil. The crude oil was 

 distilled under atmospheric pressure, and the distillation of the lower 

 portions continued until they came together in larger quantities at tem- 

 peratures at which distillates were collected from the other oils. The 

 specific gravity of the distillates after treating with concentrated sulphuric 

 acid is as follows : — 



98 -100\ 118'^-120^. 134^-136^. 160^-162°. 194°-196°. 212^-214°. 228°-230^. 



0.7364 0.7631 0.7772 0.8088 0.8493 0.8674 0.8770 



The last three fractions were also treated with fuming sulphuric acid and 

 the specific gravity determined : — 



194:'='-Jm°. 212°-214°. 228='-230°. 



0.8412 0.8650 0.8720 



The slight change after the thorough treatment with fuming sulphuric 

 acid shows that no benzol homologues were present in these portions, 

 yet the specific gravity of the hydrocarbons above 196° is considerably 

 higher than of those from Amaze oil or from Hirei oil. The distillates 



* Unpublisliod data. 



