184 Prof, Berzelius and Dr, Marcet's Experiments 



whole of the sulphuret of carbon had not been decomposed. A 

 black powder remained in the retort, which was found to be 

 charcoal, and afforded us a new and unequivocal proof of the 

 presence of carbon in the oily substance. 



This imperfect decomposition of the sulphuret of carbon in 

 alkaline solutions, was found an insurmountable objection to 

 this mode of analysis ; and induced us to try the method of 

 distilling the sulphuret through ignited metallic oxyds. 



5. For this purpose, we introduced a glass tube (BC), in 

 an inclined direction, through a small stove (tig. 1, A), the 



tube being protected by lute, and filled with red oxyd of iron 

 coarsely pulverized. The sulphuret of carbjn, after being ac- 

 curately weighed, was enclosed in a little retort (E), which we 

 hermetically sealed to the upper extremity of the tube (B). 

 To the other extremity (C), we adapted another glass tube 



