342 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Hydrocarbon Cul^i, B. P. 150^-155° (fiO mm.). 



Before treatment with acids, the distilkite lo0°-155^ gave as its 

 specific gravity at 20°, 0.8649 and 0.8621 after purification with con- 

 centrated and fuming sulphuric acid and washing witli caustic soda. 



A combustion gave percentages of carbon and hydrogen corresponding 

 to the formula C13II24. 



0.1357 gram of the oil gave 0.4312 gram CO2 and 0.1G53 gram H.^O. 



Calculated for CisIIoe- Found. 



G 86.67 86.68 



H 13.33 13.62 



The molecular weight of this hydrocarbon at the freezing jioiut of 

 benzol indicated the same formula. 



0.3641 gram of the oil and 18.17 gram benzol gave a depression of 

 0°.541. 



Calculated for CijH,^. Found. 



180 181.0 



A determination of the index of refraction gave 1.4681, from which 

 the molecular refi-actiou was calculated : 



Calculated for Ci^II,,. Found. 



57.74 58.05 



Htdrocarbon CieHso, B. P. 17o°-180° (60 mm.). 



The refraction 175°-180° was rather thick and viscous, with a specific 

 •gravity, un purified, at 20°, 0.8832. After purification its specific grav- 

 ity was reduced to 0.8808 with comparatively little change. Percent- 

 ages of carbon and hydrogen by combustion corresponded to the formula 



0.1533 gram of the oil gave 0.4879 gram CO. and 1797 gram ILO. 



Calculated for Ci,;H;^. Found. 



C 86.48 86.82 



H 13.52 13.11 



A determination of molecular weight at the freezing point of benzol 

 gave the same formula. 



