344 PROCEEDINGS OF THE AMERICAN ACADEMY. 



0.1494 gvam of the oil gave 0.4787 gram CO^ and 0.1713 gram H^O. 



Calculated for C13U32. Found. 



C 87.10 87.38 



H 12.90 12.83 



An 18-carbon compound was shown by a determination of its molec- 

 ular weight at the freezing point of benzol. 



0.8281 gram of the oil and 18.94 grams benzol gave a depression of 

 0°.864. 



Calculated for Cigllsj. Found. 



248 248 



This formula was also shown by the index of refraction, which was 

 found to be 1.484 at 20^ and the molecular refraction : 



Calculated for C1JII32. Found. 



78.64 78.86 



Hydrocarbon C.^H^^, P. B. 250°-255^, 60 mm. 



The viscous distillate 250°-25o° gave as its specific gravity at 20° 

 0.9299. A combustion gave values for carbon and hydrogen for the 

 series CuH2u_,. 



0.1481 gram of the oil gave 0.4745 i^ram CO^ and 0.1628 oram H.jO. 



C 

 H 



Determinations of the molecular weight of this hydrocarbon at the 

 freezing point of naphthaline gave results corresponding to the formula 



I. 0.5682 gram of tlie oil and 11.66 grams naphthaline gave a depres- 

 sion of 1°. 022. 

 II. 0.4777 gram of the oil and 12.21 grams naphthaline gave a depres- 

 sion of 0°. 819. 



Calculated for Found. 



C2,II„. I. II. 



332 329 330 



