374 W. G. Mixter — Deportment of Charcoal with 



phide. Solid compounds of carbon and sulphur formulated 

 as CS . C 2 S 3 , and C 2 S 6 have, however, been described. 



Experiment 1. — 30*9 grams of air dry soft sugar charcoal 

 were kept at the highest temperature of a combustion furnace 

 for an hour and a half, and during this time the vapor of 30 

 grams of sulphur was brought into contact with it. No sul- 

 phur passed unchanged over the charcoal but hydrogen sul- 

 phide came off abundantly during the first half of the tims of 

 heating. When all the sulphur had been distilled from the 

 end of the tube containing it dry hydrogen was passed in and 

 hydrogen sulphide was again formed. The charcoal after cool- 

 ing in a current of hydrogen weighed 30" 1 grams and con- 

 tained according to two estimations 20 02 and 19*95 per cent 

 of sulphur. The sulphurized charcoal gave up no sulphur 

 when treated for five minutes with a boiling solution of potas- 

 sium hydroxide having a density of 15. The charcoal sank 

 in the solution and hence had a density higher than 1*5. A 

 portion of the charcoal gave off at the heat of a combustion 

 furnace a little hydrogen sulphide and sulphur but no carbon 

 disulphide, while another portion gave off the last at a bright 

 red heat in a Perrot furnace. A third portion of the sul- 

 phurized charcoal was placed in a porcelain crucible surrounded 

 by sugar charcoal in a clay crucible and was heated to the 

 highest temperature of a Perrot furnace which melted cast 

 iron readily. The charcoal after the intense ignition retained 

 3 4 per cent of sulphur. It was free from ash and, when 

 burned in a current of moist oxygen in a combustion furnace, 

 left a small amorphous black coal which disappeared when the 

 tray holding it was heated over a blast lamp. 



Experiment %. — Vapor of carbon disulphide was passed for 

 an hour over soft sugar charcoal at a red heat. The carbon 

 disulphide was displaced by dry hydrogen in which the char- 

 coal was allowed to cool. Hydrogen sulphide was formed 

 abundantly at first, while during the latter part of the time of 

 heating but little was detected. The charcoal sulphurized by 

 carbon disulphide was found to contain 11-14 per cent of sul- 

 phur. 



Experiment 3. — 1*2632 gram of sugar charcoal containing 

 0426 per cent of hydrogen and 04 per cent of ash was 

 exposed for twenty minutes to sulphur vapor at the highest 

 heat of a gas combustion furnace and then was allowed to cool 

 in a current of dry hydrogen. The charcoal lost 0*0055 gram 

 in weight and was found to be free from sulphur. 



Experiment 4- — Charcoal such as used in the preceding test 

 was subjected to sulphur vapor at the temperature of a Perrot 

 furnace. It was next heated to redness in a crucible to drive 



