MABERY. — ON THE COMPOSITION OF PETROLEUM. 337 



cation as its specific gravity at 20°, 0.8200. After purification with 

 concentrated ami fuming sulphuric acid, its specific gravity was reduced 

 to 0.8099. This hydrocarbon was shown to be of the series CnlL,, by 

 determinations of carbon and hydrogen. 



I. 0.1 657 gram of the oil gave 0.5185 gram CO., and 0.2135 gram H._,0. 

 II. 0.1656 gram of the oil gave 0.5201 gram CO., and 0.2079 gram II.^O. 



The formula was shown by its molecular weight. 



0.3121 gram of the oil and 18.46 grams benzol gave a depression of 

 0°.418. 



Calculated for CjjII^g. Found. 



196 198 



This hydroc:iboii gave 1.449 as its index of refraction, which corre- 

 sponded to the molecular refraction of the same formula : 



Calculated for CnUoj,. Found. 



64.44 65.02 



This hydrocarbon distilled under atmospheric pressure with some 

 decomposition at 244'-248°. Further couiirmation of the formula was 

 obtained by the composition of the chloride, which was formed in the 

 same manner as described above. The product of chloriuation was 

 submitted to fractional distillation, which caused a considerable portion 

 to collect at 180^, 15 mm. Specific gravity of the chloride at 20^, 0.9288. 

 A determination of chlorine gave the percentage required for the mono- 

 chloride. 



0.1690 gram of the substance gave 0.1039 gram AgCl. 



Calculated for C,4H27C1. Found. 



CI 15.40 15.21 



The molecular weight of the chloride was found at the freezing point 

 of benzol. 



0.7890 gram of the substance and 23.80 grams benzol gave a depression 

 0°.718. 



Calculated for C„H„CL Found. 



230.5 226.4 



VOL. XL. — 22 



