272 PROCEEDINGS OF THE AMERICAN ACADEMY. 



The percentages of carbon and hydrogen given by analysis supported 

 the formula of undekanaphtene : — 



0.1466 grm. of the oil gave 0.4588 grm. COg and 0.1909 grm. Up. 



Calculated for CnHjo. Found. 



C 85.70 85.37 



H 14.30 14.47 



Some of the Bardsdale distillates, 140°-220°, 50 mm,, turned pink 

 soon after they were collected, changing to a darker red on standing, and 

 after some time they deposited a dark oil. The colored distillates alter- 

 nated with the others, leaving sharply lined uncolored oils beside those 

 depositing the insoluble heavy oils. The following distillates were 

 colored : — 



154°-156°, 158°-160°, 168°-170°, 180°-182°, l98°-206°, 212°- 

 216°- 



The distillates between these were nearly or quite colorless. This 



coloration was caused by the phenol bodies, which are easily extracted 



by alkaline hydrates. The bodies will receive further attention in 



another paper. 



Adams' Canon Oil. 



The Adams' Canon Oil from the Ex-Mission district was thicker and 

 heavier than the oils previously described. The specific gravity of this 

 specimen at 30" was 0.9212. It contained a large percentage of nitro- 

 gen, 1.46, determined by the volume of nitrogen. The Kjeldahl method 

 gave 0.58 per cent. Two determinations of sulphur gave, (I.) 0.92, 

 (II.) 0.87. This oil contained a very small proportion of the lower 

 hydrocarbons. 100 grms. distilled under atmospheric pressure gave 

 8 grms. below 150°, and 27 grms., 150°-300°. The specific gravity 

 of the lower distillate was 0.7673, and of the higher, 0.8457. In 

 vacuum distillation, 9382 grms. of the crude oil gave the following 

 weights : — 



-150^At. Pr. -120° 120-^-160° 160°-250° 



123 865 1045 525 



Nearly three-fourths of the original oil remained above 250°. 

 Continuing the distillation of the lower distillates within 5° and 2°, 

 the following weights were collected: — 



96°-100=' 116°-120° 158°-160° 168°-170° 180°-182° 



37 10 12 20 10 Grms. 



