300 PROCEEDINGS OF THE AMERICAN ACADEMY. 



It give as its specific gravity at 20°, 0.7787. 



The refractive index of this oil was found to be 1.4348. and the 

 molecular refraction, 12.27 ; calculated for C.,II 18 , 41.42. This con- 

 stituent was therefore trimethylhexametbylene. 



A distillate collected in considerable quantity at 1G0°-1G2°, which 

 was purified with filming sulphuric acid and analyzed: — 



0.2055 grm. of the oil gave 0.6445 grm. CO, and 0.2556 grm. 11,0. 



Calculated for C 10 H 20 . Found. 



C 85.70 85.."." 



II 14.30 13.82 



This "il gave as its specific gravity at 20°, 0.7002. Its index of 

 refraction was 1.4418, and its molecular refraction, 4G.04 ; calculated 

 for CxoH-jo, 46.03. 



The distillate at 100°-102°, after purification with fuming sulphuric 

 acid, gave as its specific gravity at 20°, 0.80G1. Its composition was 

 determined by analysis : — 



0.1G12 grm. of the oil gave 0.5046 grm. CO, and 0.2025 grm. 11,0. 



Calculated for '',,11^. Found. 



C 85.70 85.35 



II 1 1.30 13.96 



The molecular weight of this hydrocarbon at the freezing point of 

 benz<>l was 156; calculated for ('nil,,. 154. The index of refraction 

 at 20 was 1.4482, and the molecular refraction 51.24; calculated for 

 C„II,,. 50.63. 



The distillate 212°-214°, purified with fuming sulphuric acid, gav< 

 its specific gravity at 20°, 0.8165. A combustion gave the following 

 proportions of carbon and hydrogen: — 



0.1875 grm. of the oil gave 0.5870 grm. CO, and < >.J 1 "> 1 grm. 11,0. 



Calculated (brC„H M . Found. 



C 85.70 ' s -"'-"»l 



II 14.80 14.52 



A determination of it- molecular weight at the freezing point gave 

 172; calculated for C,..!!.,,. 168. fa index of refraction was L. 4535, and 

 the molecular refraction, o<~>. 70; calculated for CigH M) 55.23. 



