MABERY. — COMPOSITION OF PETROLEUM. 269 



value obtained was 0.8116, and afterward 0.7955. A combustion gave 

 8G.27 per cent of carbon, and 13.79 per cent of hydrogen. Evidently, 

 like the Fresno oil, Puente oil has no constituent with this boiling point, 

 except perhaps a benzol homologue. 



Undekanaphtene, C11H22, 195°. 



A naphtene should be expected between 190° and 200°, since undeka- 

 naphtene, C11H22J is a constituent of the Fresno oil. The 20 grams 

 collecting at 190°-192° gave as its specific gravity at 20°, 0.8196, and 

 after treatment with fuming acid, 0.8046 (0.8055 at 14°, Markovvnikoff). 

 A combustion of the oil after treatment gave 85.90 per cent of carbon 

 and 13.85 per cent of hydrogen. 



The series C„H2„+2 forms no part of the Puente oil, at least above 95°. 

 The low percentage of hydrogen seems to indicate a series still poorer in 

 hydrogen than the naphtenes, especially in the higher distillates, possi- 

 bly a series C„H2„_2, containing two naphtene rings. Whether such hy- 

 drocarbons are really present, or whether benzol homologues have not 

 been completely removed, will appear in more prolonged distillation of 

 these oils boiling above 200°. 



o 



BA.RDSDALE OiL. 



The specimen marked Owens No. 2, sent by the Union Oil Co. from 

 the Bardsdale district, was quite thick and heavy. Its specific gravity at 

 20° was 0.8923. It contained 1.25 per cent of nitrogen, as shown by the 

 volume of nitrogen collected. A Kjeldahl determination gave 0.50 per 

 cent. A Carius determination gave 1.5 per cent of sulphur, showing it 

 to be a high sulphur oil. A combustion gave 84.17 per cent of carbon 

 and 12.15 per cent of hydrogen. 108 grms. of the oil distilled under 

 atmospheric pressure gave the following weights : — 



310°-410° 



7 Grms. 



Specific gravity. 



In distilling 5088 grms. under 50 mm., except -150° the following 

 weights were obtained : — 



-150° At. Pr. 150''-200° 200='-250° 250='-290° 



250 555 374 1165 Grms. 



The two fractions below 200° were distilled within 5°, and then 

 within 2°, which brought together the following weights with smaller 

 quantities at neighboring temperatures : — 



