326 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 0.1462 gram of the oil gave 0.4590 gram CO, and 0.1860 gram 



11,0. 

 II. 0.1281 gram of the. oil gave 0.4020 gram COo and 0.1635 gram 



H,0. 

 III. 0.1563 gram of the oil gave 0.4906 gram CO2 and 0.2000 gram 



IIoO. 



The malecular weight of tliis hydrocarbon determined at the freezing 

 point of benzol supported the formula C12H04. 



1.1097 gram of the oil and 29.394 grams benzol gave a depression of 



1°.067. 



Calculated for C12H24. Found. 



168 173 



The same formula was verified by the index of refraction, 1.4350, from 

 which the molecular refraction was calculated. 



Calculated for Ci2ll24- Found. 



54.24 55.00 



It is therefore evident that this hydrocarbon has the composition of the 

 series CnHsn. The only explanation that can be offered as to the differ- 

 ence between it and the product with the same boiling point separated 

 before is that the different specimens of oil coming from different sources 

 must have differed with respect to this hydrocarbon. 



Hydrocarbon CisH.g, B. P. 123°-125° (30 mm.). 



After ten distillations under 30 mm., 27 grams collected at 129°-130° 

 that distilled under atmospheric pressure at 223°-225°. After careful 

 purification the specific gravity of this distillate was found to be 0.8055 

 at 20°. It was shown to belong to the series CnH..„ by the following 

 combustions : 



I. 0.1536 gram of the oil gave 0.4824 gram CO., and 0.1902 gram H„0. 

 II. 0.1336 gram of the oil gave 0.4195 gram COo and 0.1710 gram ILO 



Calculated for Found. 



C^Ujo I. n. 



C 85.70 85.65 85.63 



H 14.30 13.85 14.32 



