MABERY. — SULPHUR PETROLEUMS. 63 



Canadian oils have been ii)dicated in the preceding pages. Besides 

 the higher vacuum distillates sodium salts of acids have been separated 

 whose composition is now being determined. The facts thus far 

 accumulated are not sutficient to determine whether the acids exist as 

 such in the oils, as is maintained by Aschan, or whether they are oxi- 

 dation products of other constituents, as Engler and Lachowitz 

 believe. Since sodium salts have been obtained which contain much 

 nitrogen and give the characteristic odor of pyridine compounds when 

 heated, the possibility of pyridine carboxylic acids is suggested. In 

 searching for the oxygen and nitrogen compounds we have separated 

 bodies that give with nitric acid a brilliant red color, similar to what 

 was early observed iu our study of the sulphur derivatives. 



The characteristic qualities of Canadian petroleum which appear in 

 the results of this examination may be summarized as follows: — 



1. In its high specific gravity and in the proportions that distil at 

 different temperatures, Canadian petroleum approaches the Russian 

 oil more nearly than the Ohio petroleum. But the sjiecific gravity of 

 the distillates is lower, approaching those of Ohio oil. As indicated 

 by its lower specific gravity, Oil Springs oil is essentially different 

 from Petrolia oil. This is especially evident in the lower percentage 

 of sulphur, the larger quantities of the distillates, the higher specific 

 gravity of these distillates, and the higher bromine absorption. 



2. Petrolia oil is composed principally below 150° of members of 

 the series C„Il2„ + 2? although iu much smaller quantities even* than in 

 Ohio oil. Another series is present capable of forming nitro products 

 resembling the nitro compounds of the series C„H2„ + 2' or the unsatu- 

 rated hydrocarbons C,,!!,^. 



3. The aromatic hydrocarbons C„Il2„_e, benzol, toluol, para- and 

 meta-xylol are present in minute proportions. The hexahydro series 

 is represented by hexahydroisoxylol, and probably by higher members. 



4. By the behavior of the distillates toward bromine, the presence 

 of hydrocarbons capable of forming addition products is indicated, as 

 well as the formation of unsaturated hydrocarbons due to cracking in 

 the distillates above 200° or 250°. 



5. As in Ohio oil, the sulphur compounds have a tendency to 

 collect in the higher fractions. 



In the prosecution of this work I have recnved valuable aid from 

 my assistants, Messrs. Cleveland, Little, and Giessen, and in portions 

 of the work on the Canadian petroleum, from Mr. W. H. King, a stu- 

 dent in this Laboratory. 



