MABERY. — CONSTITUENTS OF PETROLEUM. 139 



and sulphuric acids, and allowed to stand several hours. After separation 

 from the small quantity of the heavy nitro product and the acid, the oil 

 was boiled with sodium until there was no further action, and the metal 

 remained unaffected on standing several weeks. The oily nitro product 

 deposited a small quantity of crystals on standing, but not enough to 

 purify for a determination of its melting point. 



Purified in this manner, this distillate gave the following results on 

 analysis : — 



I. 0.1547 gram of the oil gave 0.4816 gram CO2, and 0.2104 gram 



HoO. , 



II. 0.1474 gram of the oil gave 0.4562 gram COo, and 0.2017 gram 

 HoO. 



Calculated for Found. 



C 84.72 84.87 84.41 



H 15.28 15.12 15.21 



Its specific gravity at 20° was found to be 0.7684. 



Another portion of the crude fraction 209°-210°, purified by thorough 

 agitation and warming with fuming sulphuric acid, twice repeated, gave 

 the following results on analysis : — 



0.1471 gram of the oil gave 0.4537 gram CO2, and 0.2068 gram HgO. 



The specific gravity of the oil after treatment with the fuming acid 

 was 0.7729, somewhat higher than the portion purified with nitric and 

 sulphuric acids. It is quite possible that the purification with fuming sul- 

 phuric acid, in this instance, was not capable of removing the contaminat- 

 ing bodies as thoroughly as the other method. The purified hydrocarbon 

 was found to distil completely at 214°-216°, under a tension of 760 mm., 

 and with the mercury column all in the vapor. A determination of 

 its molecular weight by the Beckmauu method gave Mr. Hudson 173 ; 

 required for the formula CigHge, 170. 



In the formation of the chlorine derivatives from the hydrocarbon 

 C12H26, Pennsylvania petroleum, 95 grams of the purified hydrocarbon 

 was exposed to the action of chlorine until 30 grams was absorbed. 

 Apparently chlorine substitutes as readily in the hydrocarbons of higher; 



