284 PROCEEDINGS OF THE AMERICAN ACADEMY. 



A chlorine determination gave the following percentage: — 

 0.1572 grm. of the oil gave 0.1872 grm. AgCl. 



Calculated for C H„C1. Found. 



CI 29.92 29.50 



The molecular weight was determined at the freezing point of benzol.. 

 1.1611 grm. of the oil and 1'.). !>2 grm. benzol gave a depression of 

 •_' .482. 



Calculate l for (', H,,C1. Found. 



118.5 118 



The index of refraction at 20° was found to be 1.41 G, and the molecu- 

 lar refraction, 33.29. Required for ( I !,.''!. 32.54. Hexamethylene is, 

 therefore, the principal hydrocarbon with this boiling point. 



In distilling the portions of California petroleum below 100°, it has 

 always been observed that a distillate collected at 90°-91°. To ascer- 

 tain whether a hydrocarbon were really present with this boiling point, 

 distillation of the fractions ,s.V'-l<»i> was continued through a tall 

 Hempel column until a larger portion collected at 89°-90°. The specific 

 gravity of this fraction without purification was 0.720.3, HJ-| . After 

 thorough treatment first with common sulphuric acid, then with fuming 

 acid, the specific gravity was not changed, 0.7295. The index of re- 

 fraction of this hydrocarbon at 20° was 1.41 1. and the molecular refrac- 

 tion 33.35 ; calculated for C 7 IIi 4 . 32.22. The molecular weight at the 

 freezing point was found to be as follows: — 



0.8G09 grm. of the oil and 17.02 grms. of benzol gave a depression 

 2 .547. 



Calculated for <'.U lt . Found. 



98 99 



With the mercury column all in the vapor, Bar. 745.3 nun., this hy- 

 drocarbon distilled completely at 90 . 1. 



The chlorine derivative of this hydrocarbon was formed by the action 



blorine over water. After washing, drying, and distillation under 



atmospheric pressure) the chloride came together at 1 15 '-150°, for the 



ino-t purt at 117. 



A determination of chlorine gave a value required for the mono- 

 chloride : — 



