MABERY. — ON THE COMPOSITION OF PETROLEUM. 327 



The molecular weight of this hydrocarbon determined at tlie freezino- 

 point of benzol corresponded to the formula Ciallno. 



0.989G gram of the oil and 25.6727 grams benzol gave a depression of 

 1°.040. 



Calculated for C,3H;j(,. Found. 



182.0 181.6 



A determination of the index of refraction gave 1.4400, which corre- 

 sponded to the molecular refraction : 



Calculated for CisU^a- Found. 



59.84 59.55 



Htdrocarbox CiJLg, B.P. 138°-140° (30 mm.). 



After the tenth distillation 45 grams collected at 138°-140° that gave 

 as its specific gravity at 20°, 0.8129, after thorough purification with acid. 

 A combustion gave values for the series C„H2n. 



0.1407 gram of the oil gave 0.4435 gram COo and 0.1787 gram HjO. 



Calculated for C^Hoj. Found. 



C 85.70 85.96 



H 14.30 14.18 



The formula was verified by the molecular weight found at the freez- 

 ing point of benzol : 



0.9552 gram of the oil and 24.5822 grams benzol gave a depression of 

 0°.975. 



Calculated for CijHoa. Found. 



196 195.2 



The index of refraction was found to be 1.4437 and the molecular re- 

 fraction supported the same formula : 



Calculated for Ci4H29. Found. 



64.44 64.10 



Hydrocarbon CisHsq, B.P. 152°-154° (30mm.). 



A fraction of 75 grams collected at first within these limits that grad- 

 ually diminished to 20 grams after the tenth distillation. After puri- 

 fication with acid, it gave as its specific gravity at 20°, 0.8204. A 



