330 PROCEEDINGS OP THE AMERICAN ACADEMY. 



0.1528 gram of the oil gave 0.4830 gram COo and 0.1845 gram H2O. 



A determination of the molecular weight at the freezing point of 

 benzol gave the formula CigHgg. 



0.9063 gram of the oil and 24.1120 grams benzol gave a depression of 

 0°.700. 



Calculated for CiiiHjf,. Found. 



264 263 



This formula was further verified by its index of refraction, which was 

 found to be 1.4614, corresponding to the following molecular refraction: 



Calculated for CigHsj. Found. 



85.35 85.57 



Hydrocarbon CsiH.o, B. P. 213°-217° (30 mm.). 



The hydrocarbon C20H33 apparently did not appear, since the distillates 

 were small, with no appearance of accumulating below 213°, at which 

 point a larger amount was collected that proved to be the hydrocarbon 

 C21H40. After the tenth distillation 25 grams collected that gave as its 

 specific gravity at 20°, 0.8417. After filtration at —10° the specific 

 gravity was raised to 0.8546 at 20°. The percentages of carbon and 

 hydrogen corresponded to the series CnHjn.j 



0.1362 gram of the oil gave 0.4330 gram CO.. and 0.1675 gram HgO. 



A determination of the molecular weight at the freezing point of 

 benzol gave a value required for the formula C21H40. 



1.1020 gram of the oil and 25.1400 grams benzol gave a depression of 

 0°.734. 



Calculated for CjiH^o. Found. 



292 292.6 



