336 PROCEEDINGS OF THE AMERICAN ACADEMY. 



A determination of the molecular weight of this hydrocarbon gave 

 values requiied for Ci^H^c- 



0.4631 gram of the oil and 17.79 grams benzol gave a depression of 



0°.669. 



Calculated for CiaHos- Found. 



182 185 



This formula was further verified by its index of refraction ; the index 

 found, 1.444, corresponded to the molecular refraction : 



Calculated for C13H2,;. Found. 



59.84 60.59 



The formula was still further confirmed by its chloride, which was 

 formed by passing chlorine through the purified oil over water in diffuse 

 sunlight until sufficient was absorbed to form the greatest yield of mono- 

 chloride. After several distillations in vacuo a considerable portion 

 collected at 165°, under a tension of 15 mm. A Carius determination 

 gave the required percentage of chlorine for the monochloride. 



0.1548 gram of the oil gave 0.1014 gram AgCl. 



Calculated for C^.IU^CX. Found. 



CI 16.40 16.20 



The molecular weiglit of the chloride was determined by the freezing 

 point method. 



0.3069 gram of the oil and 19.14 grams benzol gave a depression of 

 0°.355. 



Calculated for CigH.^^Cl. Found. 



216.5 220.4 



The formula of tlie chloride was also shown by its index of refraction ; 

 the index found, 1.465, corresponded to the molecular refraction : 



Calculated for CiJIajCl. Found. 



64.78 65.02 



A determination of the specific gravity of the chloride gave 0.9221. 



Hydrocarbon C14ILS, B. P. 14r-143° (50 mm.). 



After the twentietli distillation, a fraction collected in considerable 

 quantity within the limits 141°-142°, 50 mm., that gave without purili- 



