832 PROCEEDINGS OF THE AMERICAN ACADEMY. 



0.1515 ^ram of the oil gave 0.4804 gram CO^ and 0.1855 gram IlgO. 



Calculated for C^H^g. Found. 



C 86.23 86.48 



H 13.77 13.70 



The molecular weight determiued at the freezing point gave the value 

 required for C.24H46- 



1.0900 gram of the oil and 28.0340 grams benzol gave a depression of 

 0°.570. 



Calculated for C24II46. Found. 



334 334 



With hydrocarbons of such high molecular weights, the limits of accu- 

 racy in determinations by the fi'eezing point method with the aid of 

 solvents commonly used are reached on account of the slight depression 

 of the freezing point. 



A determination of the index of refraction gave 1.4715, which corre- 

 sponds to the molecular refraction of C24H46' 



Calculated for C24H45. Found. 



108.4 108 



Several higher fractions were collected at points where the oil showed 

 a tendency to accumulate, and the results of analysis indicated a series 

 still poorer in hydrogen, C„H2n_4. 25 grams of the oil collected at 253°- 

 255°, from which the solid was separated by filtration at — 10°, and the 

 heavy viscous oil was purified by sulphuric acid in gasoline solution. 

 Specific gravity of the purified oil at 20° was found to be 8842. A 

 combustion gave values for carbon and hydrogen required for the series 



0.1424 gram of the oil gave 0.4511 gram COo and 0.1718 gram HoO. 



Calculated for C23II42. Found. 



C 86.79 86.42 



H 13.21 13.49 



Several attempts to determine the molecular weight of this hydrocar- 

 bon by the freezing point method failed on account of the slight depres- 

 sion, and the amount of oil was not sufficient for a determination by tlie 

 boiling point method. The index of refraction was found to be 1.47!t7, 

 which corresponds to the following molecular weight: 



