276 PROCEEDINGS OF THE AMERICAN ACADEMY. 



OCTONAPHTENE, CgHig. 



The specific gravity of the crude distillate 118°-120° was 0.7598, 

 and after purification with fuming sulphuric acid and sodic hydrate, 

 0.7530. A combustion of the unpurified oil gave 86.21 per cent of 

 carbon and 13.35 per cent of hydrogen, 



A combustion after purification indicated octonaphtene, although the 

 percentage of hydrogen is somewhat too high, probably on account of 

 accidental moisture : — 



0.1470 grm. of the oil gave 0.4598 grm. COg and 0.1976 grra. H2O. 



Calculated for CgHig. Found. 



C 85.70 85.34 



H 14.30 14.93 



The distillates 135°-140° consisted largely of the xylols. 



Dekanaphtene, CioHao- 



The specific gravity of the crude fraction 158°-160° was 0.7742, and 

 after purification with the fuming acid and sodic hydrate, 0.7742. Car- 

 bon and hydrogen were determined in the purified oil : — 



0.1455 grm. of the oil gave 0.4583 grm. CO2 and 0.1804 grm. HgO. 



Calculated for Cjo Hjo. Found. 



C 85.70 85.91 



H 14.30 13.78 



The specific gravity of the crude distillate 168°-170° was 0.7928, 

 and 0.7840 after treatment with fuming acid and sodic hydrate. A 

 combustion of the purified oil gave 85.98 per cent of carbon and 13.69 

 per cent of hydrogen. 



The fraction 178°-182° had the specific gravity before treatment, 

 0.8006, and afterward, 0.7924. A combustion of the oil after treatment 

 gave 85.97 per cent of carbon and 13.51 per cent of hydrogen. The 

 fraction 198°-200° had the specific gravity of 0.8133, and after treat- 

 ment, 0.8069. The following percentages of carbon were given by com- 

 bustion : carbon, 86.51 ; hydrogen, 13.54. 



The low proportions of hydrogen and high proportions of carbon 

 alluded to before are especially apparent in the Torrey oil. Whether 

 this be due to a higher series or to benzol homologues not easily 



