OP ARTS AND SCIENCES. 227 



I. 0.1633 gr. of the oil gave 0.2Go7 gr. BaSO,. 

 II. 0.2929 gr. of the oil gave 0.3236 gr. BaSO^. 



Bubjlpentyl Sulphide. 



An inspection of the weights collected at different temperatures 

 given on page 220 will show a tendency of the distillates to collect at 

 certain temperatures, and this is especially evident in the fraction 

 135° — 140°. As the distillation proceeded, the fractions at these 

 points increased in quantity, and, so far as examined, each of them 

 corresponded to a definite sulphide. From the fraction 135° — 140° 

 an oil was obtained by decomposition of the addition product with 

 mercuric chloride that distilled at 185° — 190° (Bar. = 740 mm.) and 

 the percentage of sulphur corresponded to butylpentyl sulphide. 



I. 0.2509 gr. of the oil gave 0.3721 gr. BaSO^. 

 II. 0.2676 gr. of the oil gave 0.3925 gr. BaSO^. 



Calculated for {^^^'^[S. j ^^^^- „ 



S 20.00 20.37 20.14 



It is hardly probable this product was a mixture of butyl and 

 pentyl sulphides, since it was obtained at different times after pro- 

 longed distillation. It will be further examined. 



Pentyl Sulphide. 



This sulphide was separated from the fraction 150—155° (P = 

 100 mm.) by conversion into the mercury compound and decomposition 

 with hydric sulphide. Different preparations from independent frac- 

 tions distilled with very little decomposition at 205 — 210° (Bar. = 

 745.5 mm.), which is somewhat lower than the boiling point assigned 

 to pentyl sulphide (216°). But from the results of analysis there 

 can be no doubt as to the composition of this sulphide. 



T. 0.1987 gr. of the oil gave 0.2717 gr. BaSO,. 



II. 0.2723 gr. of the oil gave 0.3716 gr. BaSO,. 



III. 0.2844 gr. of the oil gave 0.3902 gr. BaSO,. 



It is quite probable that the low boiling point was due to the 

 presence of a very small quantity of a lower sulphide, since the 



