MABERY. THE COMPOSITION OP PETROLEUM. 585 



I. 0.1538 grm. of the oil gave 0.4800 grin. C0 2 and 0.1992 grms. 

 H,0. 

 II. 0.1560 grm. of the oil gave 0.4874 grm. C0 2 and 0.2024 grm. 

 H 2 0. 

 III. 0.1362 grm. of the oil gave 0.4257 grm. C0 2 and 0.1788 grm. 

 H 2 0. 



Found. 

 I. II. III. 



85.09 85.21 85.25 

 14.40 14.42 14.59 



The molecular weight was determined as follows : — 



I. 0.8367 grm. of the oil and 20.38 grms. benzol gave a depression of 

 0°.642. 

 II. 2.5442 grms. of the oil and 21.91 grms. benzol gave a rise in boil- 

 ing point of 0°.9566. 



Calculated for Found. 



C 22 II U . I. II. 



308 313.4 311.3 



The index of refraction was found to be 1.454 and the molecular 

 refraction : — 



Calculated for C K H 41 . Found. 



101.27 100.7 



The distillates in the vicinity of 240°, 50 mm., deposited no solid on 

 standing at ordinary temperatures, but higher fractious all deposited 

 solids. When cooled to 0°, the fraction 242°-254° became nearly solid. 

 After further cooling to —10°, the solid was filtered in a funnel sur- 

 rounded with salt and ice, pressed in filter paper and crystallized from 

 ether and alcohol. The solid melted at 43°, and further purified from 

 gasoline, at 44°. Krafft gave 44°. 4 as the melting point of the hydro- 

 carbon C 22 H 46 . Its specific gravity at 60° was found to be 0.7796. A 

 combustion gave proportions of carbon and hydrogen required for the 

 series C n H 2n+2 . 



0.1521 grm. of the solid gave 0.4721 grm. C0 2 and 0.2021 grm. H 2 0. 



