MABERY. — COMPOSITION OP PETROLEUM. 277 



removed will appear later in -the composition of the higher vacuum 

 distillates. 



The Torrey distillates l40°-220°, 50 mm., showed a larger proportion 

 of oxygen and nitrogen compounds than any other of the crude oils. 



Scott's Hill (Sespe District) Oil. 



The specimen of petroleum from Scott's Hill was lighter than the 

 Torrey oil ; its specific gravity at 20° was 0.8782. It contained 1.25 

 per cent of nitrogen. Two determinations of sulphur gave (I.) 0.38 and 

 (II.) 0.49 per cent. 8260 grms. of the crude oil gave the following 

 weights on distillation in vacuo : — 



-150° At. Pr. -160° 160 D -208 D 208°-275° 



1220 495 930 880 



The distillate -150° was collected under atmospheric pressure, the 

 others under 70 mm. The portion -150° was subjected to further dis- 

 tillation collecting at first within 5°, and twice within 2°. The fractions 

 collected in larger quantities within the following limits : — 



f 



66 D -70° 86°-90° 96VL(XP 116 3 -12(P 133^-14(P im°Am° 170°-174° 178°-182° 190°-192° 



26 38 35 37 38 62 41 38 41 



Continuing the distillation of the higher fractions in vacuo, after the 

 third distillation within limits of 2°, the larger quantities collected 

 within the following limits with smaller quantities between : — 



144°-148° 164 D -1C8° 182 : '-186 210°-214 c ' 



60 55 65 23 



In distilling corresponding fractions from other fields in vacuo a 

 tendency to collect within the same limits was observed. After agita- 

 tion with fuming sulphuric acid, the fraction 66°-70° atmospheric pres- 

 sure gave as its specific gravity at 20°, 0.6984; the specific value much 

 higher than the specific gravity of hexane, 0.6630(17°5). A combus- 

 tion gave percentages of carbon and hydrogen correspondiug to a mix 

 ture of hexamethylene and hexane : — 



