96 PROCEEDINGS OF THE AMERICAN ACADEMY. 



solution, and 84 grams of the sulphur oil. Without further purification, 

 the latter gave 16.08 per cent sulphur. After continued fractioning in 

 vacuo the sulphur oil collected for the most part at 128°-130°, 50 mm., 

 and on analysis it gave the percentages of carbon, hydrogen, and sulphur 

 required for the formula C n H 22 S. 



I. 0.1793 gram of the oil gave 0.4669 gram C0 2 , and 0.1896 gram H 2 0. 

 II. 0.2064 gram of the oil gave 0.5334 gram C0 2 , and 0.2122 gram H 2 0. 

 III. 0.1921 gram of the oil gave 0.2411 gram BaS0 4 . 



in. 



1724 



The specific gravity of this sulphur oil was found to be 0.9147 at 20°. 

 Particular attention was given to the purification of this product to be 

 certain of the series as shown by the most careful analysis. In addition 

 to the determinations given above that demonstrate its composition, the 

 following additional analyses were made of different preparations : 

 carbon found, 70.73, 70.74; hydrogen in the same combustions, 11.48, 

 11.95; sulphur, 17.28, 17.05, 17.10. 



The portions of the original sludge oil, called sulphur-free oils to 

 distinguish them from the sulphur oils, have contained from 0.1 to 0.3 

 per cent of sulphur, and it has been assumed that the small proportion of 

 sulphur indicated a little of the sulphur compound not precipitated by 

 mercuric chloride. That the part collecting above the alcohol after 

 precipitation is a different product from the part remaining in solution in 

 alcohol is shown by the difference in specific gravity. For example, the 

 distillate 136°-145° from which the oil C n H 22 S was obtained gave an 

 oil insoluble in alcohol with a specific gravity 0.8412; but the specific 

 gravity of the portion in solution was found to be 0.8107. Similar 

 differences appeared in oils associated with other thiopbanes. Since the 

 specific gravity of any one of the principal hydrocarbons in Canadian 

 petroleum corresponding in boiling point with these bodies is smaller 

 than the specific gravity of the sulphur oils, and since hydrocarbons are 

 sparingly soluble in sulphuric acid and alcohol, the bodies under exami- 

 nation cannot be the principal petroleum hydrocarbons. Then the odors 

 of both the substances soluble and insoluble in alcohol are unlike that 

 of any of the hydrocarbons, — very pungent, resembling the terpenes. 

 Further study will be necessary to identify these peculiar bodies. 



