3ULPHURETS. 207 



phuret is obtained, containing a greater propor- 

 tion of sulphur. It has a dark yellow colour, 

 and is slightly soluble in water. When heated, 

 it gives out a little water, and its excess of sul- 

 phur, and becomes bisulphuret of tungsten.* 



31. Sulphuret of columbium. Rose obtained Colum - 



bium, 



this compound by passing a current of the va- 

 pour of bisulphuret of carbon over the oxide of 

 columbium, heated to whiteness in a porcelain 

 tube. It has a dark grey colour, and assumes 

 the metallic lustre when rubbed against a hard 

 body. From Rose's experiments it is obviously 

 a compound of 



1 atom columbium . 18 

 1 atom sulphur . 2 



20 



32. Sulphuret ot titanium. I have already, Titanium, 

 in a preceding chapter of this work, given an 

 account of M. H. Rose's experiments on the 

 sulphuret of titanium ; and given my reasons for 

 considering it as a compound of 



1 atom titanium . 4 



1 atom sulphur 1 . 2 



33. Sulphuret of tellurium. According to Tellurium, 



* Larboki Kemien, IT. 179. 



