224 PROCEEDINGS OF THE AMERICAN ACADEMY 



Ethyl Sulphide. 



After long continued fractional distillations, we succeeded in ob- 

 taining a product distilling between 88° and 92° that gave a percent- 

 age of sulphur corresponding to ethyl sulphide. 



0.16.32 gr. of the oil gave 0.4183 gr. BaSO,. 



Calculated for (C^n^)^%. Found. 



S 35.55 34.86 



Ethylpropyl Sulphide. 



At several points between 91° and 130°, the boiling points re- 

 spectively of ethyl and propyl sulphides, distillates collected in con- 

 siderable quantities. A fraction that distilled tolerably constant at 

 110—112° contained a percentage of sulphur required for ethylpropyl 

 sulphide. 



0.2445 gr. of the substance gave 0.5396 gr. BaSO^. 



Calculated for 



C0H5 ) g Found. 



C3H7 ) 



30.77 30.31 



The platinum salt was formed by the addition of alcoholic chlor- 

 platinic acid, and it gave on analysis the required percentage of 

 platinum. 



0.3240 gr. of the substance gave 0.1158 gr. Ft. 



Calculated for 2 (CjHijjjS . PtCli- Found. 



Ft 36.01 35.75 



The quantity of this sulphide that we obtained was insufficient for 

 complete examination, and further study of it, as well as of other 

 fractions of low boiling points, must therefore be postponed until we 

 can secure a larger supply of material. 



Normal Propyl Sulphide. 



All attempts to isolate isopropyl sulphide were unsuccessful ; very 

 little of the distillate collected between 115° and 125°, and analysis 

 showed that it could not be the isopropyl compound that boils at 

 120°. The fraction 115-120° gave 29.29% S, and the fraction 

 120-125°, 28.52% S; calculated for (C3H,)oS, 27.12% S. Anal- 

 ysis of platinum salts of these fractions gave similar results. Nor- 

 mal propyl sulphide was readily identified in the fraction 127 — 132°, 

 which collected in larger quantities. 



