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 CeHnCl. Found. 



CI 29.92 29.50 



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

 1.164:1 grm. of the oil and 19.92 grm. benzol gave a depression of 

 2°. 482. 



Calculated for C,-,IIjiCl. Found. 



118.5 118 



The index of refraction at 20° was found to be 1.416, and the molecu- 

 lar refraction, 33.29. Required for CcHnCl, 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 85°-100° was continued through a tall 

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

 gravity of this fraction without purification was 0.7295, |^o. 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 1.411, and the molecular refrac- 

 tion 33.35 ; calculated for C7H14, 32.22. The molecular weight at the 

 freezing point was found to be as follows: — 



0.8669 grm. of the oil and 17.62 grms. of benzol gave a depression 

 2°.547. 



Calculated for C^Kl^. Found. 



98 99 



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

 drocarbon distilled completely at 90°. 4. 



The chlorine derivative of this hydrocarbon was formed by the action 

 of chlorine over water. After washing, drying, and distillation under 

 atmospheric pressure, the chloride came together at 145°-150°, for the 

 most part at 147°. 



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

 chloride : — ■ 



