MABERY. — COMPOSITION OF PETROLEUM. 283 



aromatic hydrocarbons is much larger, apparently, in California oil. The 

 homologues of benzol form a considerable proportion of the distillates, 

 especially of those with lower boiling points. In the distillate 221°- 

 222° from Puente oil so much naphtaleue was present that the distillate 

 became solid at 0°. 



California petroleum differs totally from the Eastern oils, — Pennsyl- 

 vania, Ohio, Canadian, etc., — and also materially from Russian oil, in 

 not containing members of the series C,jH2„_,.2' I" this respect, and in 

 respect to the large proportion of aromatic hydrocarbons, California 

 petroleum is unlike any other petroleum that has been examined in this 

 Laboratory. Incidentally it may be mentioned that California petroleum 

 differs from other petroleums hitherto examined in the large proportions 

 of oxygen and nitrogen compounds which it contains. These bodies are 

 under investigation in this Laboratory. 



Study of the portions with high boiling points, which is now in prog- 

 ress, will have an especial interest, since, when they are separated with- 

 out decomposition, they form the most valuable constituents of lubricating 

 oils and asphalts that have been separated from petroleum. In some of 

 the high distillates, such as those from Summerland oil, hydrocarbons of 

 the series C„H2„_2 and the series C„H2„_4 have been identified. 



No. 36. —ON THE CHLORINE DERIVATIVES OF THE IIYDRa 

 CARBONS IN CALIFORNIA PETROLEUM. 



By Charles F. Mabert and Otto J. Sieplein. 



In further confirmation of the composition of the hydrocarbon 68°-70° 

 described in tlie previous paper (Mabery and Hudson), the chlorine de- 

 rivatives were formed by exposing the hydrocarbon over water to the 

 action of chlorine, in ordinary daylight. After washing and drying, the 

 chlorine product was fractioned under atmospheric pressure until it col- 

 lected at 125° -130°, and for the most part at 126°. It distilled con- 

 stant under normal conditions with the mercury all in the vajior at 

 12o°.5. 



The specific gravity at io was 0.9255; at f^o, 0.9239 ; at l^o, 0.9143; 

 and at 5^3, 0.9044. The coefficient of expansion calculated from the 

 average of these determinations is 0.000918. 



