MABERY. — OX THE COMPO.SITION OF PETROLEUM. 345 



Hydrocarbon Q^II^r,, B. P. 3lO-3Io° (60 ram). 



This distillate was very thick and viscous. For purification it was 

 dissolved in light gasoline, and after treatment the gasoline was distilled 

 off with the aid of a current of CO^. Tlie original distillate gave the 

 specific gravity 0.9548, which was not changed by the treatment with 

 acid; it then gave 0.9451. 



Determinations of carbon and hydrogen gave values required for the 

 series C„H2„_8- 



I. 0.1479 gram of the oil gave 0.4757 gram CO^ and 0.1588 gram H.jO. 

 II. 0.1486 gram of the oil gave 0.4769 gram CO. and 0.1613 gram H^O. 



Calculated for Found. 



Co;II,„ . 



C 87.59 



H 12.11 



A determination of its molecidar weight at the freezing point of benzol 

 gave a value required for a 27-carbon compound. 



0.3985 gram of the oil and 17.488 grams benzol gave a depression of 

 0°.300. 



Calculated for C27II48. Found. 



370 372 



The same formula was supported by the index of refraction, 1.5146, 

 from which the molecular refraction was calculated. 



Calculated for CjxHjg. Found. 



116 118 



Hydrocarbon C29H50, B. P. 340°-315° (60 mm.). 



This distillate was purified as before in light gasoline. After the 

 gasoline was removed there remained an e.xtremely viscous oil, light yel- 

 low in color, that would scarcely flow at ordinary temperatures. Specific 

 gravity at 20°, 0.9778. The original fraction had scarcely any odor, 

 consequently contained no phenol derivative. 



A combustion of the purified oil gave the following values for carbon 

 and hydrogen : 



0.1489 gram of the oil gave 0.4781 gram COo and 0.1634 gram H.O. 



Calculated for CjtiHjD Found. 



C 87.44 87.76 



H 12.56 12.28 



