98 
which the sulphur vapour was in contact with the heated carbon 
was evidently too short for the fixation of sulphur by carbon to 
take place. For this reason some experiments were made in which 
the sulphur vapour was longer in contact with the carbon heated 
at a definite temperature. 
, == 
to pump 
sulphur 
carbon 
In the middle of a porcelain tube A there is a boat C with about 
2 grammes of amorphous carbon. The junction G of a thermo- 
element is on the outside of the porcelain tube at a level with the 
boat. UO is an electrical oven. On one side a tube of sparingly 
fusible glass D was fastened air-tight in the porcelain tube. The 
bent part of this tube was partly filled with sulphur. On the other side 
the tube was in connection with a receiver B, which could be cooled 
during the experiment, and which was also connected with the 
vacuum pump. First the whole apparatus was evacuated to + 2mm., 
and then the heating was started. When thedesired temperature had 
been reached, it was kept constant and — while evacuation was 
continued — the tube D was heated, so that the sulphur began to 
distill through the porcelain tube. In this way sulphur vapour flowed 
over carbon that was heated at a detinite temperature. After the 
sulphur had been distilled over, the apparatus was left to cool in 
vacuum. 
I. Carbon heated at 550°. + 6 grammes of sulphur distilled over 
during 30 min. Original weight of carbon found back: it contained 
0.91 °/, sulphur. 
IL. Carbon heated at 885°. + 4 grammes of sulphur distilled over 
during 15 min., the product obtained contained 1.53°/, sulphur. In these 
experiments most of the distilled sulphur condensed in the colder part 
of the tube, a little in the receiver which was cooled in carbonic 
acid and aleohol.. Formation of carbon disulphide (CS,) was not 
observed. If any was formed which did not condense at —80° and 
2 mm., the quantity must have been very small, because the greater 
part of the carbon was found back. 
It accordingly appears from these experiments that sulphur is 
