oj chlorine and carbon, &c. 57 
drive off all free iodine, and testing by nitrate of silver, chlo- 
ride and iodide of silver are obtained. 
Hydrogen and the vapour of the substance would not in- 
flame at the temperature of 400° F. by strong electrical sparks; 
but when the mixture was sent through a red hot tube, the 
chloride was decomposed, and muriatic acid gas and charcoal 
produced. 
The vapour of the perchloride of carbon readily detonates 
by the electric spark with a mixture of oxygen and hydrogen 
gases ; but the gaseous results are very mixed and uncer- 
tain, from the near equipoise of affinities that exist among the 
elements. 
Sulphur readily unites to it when melted with it, and the 
mixture crystallizes on cooling into a yellowish mass. When 
heated more strongly, the substance rises unchanged, and 
leaves the sulphur unaltered ; but when the mixed vapours 
are raised to a still higher temperature, chloride of sulphur 
and proto-chloride of carbon are formed. Sometimes there 
are appearances as if a carburet of sulphur were formed, but 
of this I have not satisfied myself. 
Phosphorus at low temperatures melts and unites with 
the substance, without any decomposition. If heated in the 
vapour of the substance, but not too highly, it takes away 
chlorine, and forms the proto-chlorides of phosphorus and 
carbon. If heated more highly, it frequently inflames in the 
vapour with a brilliant combustion, and abundance of char- 
coal is deposited. Sometimes I have had the charcoal left in 
films stretching across the tubes, and occupying the space 
where the flame passed. The appearance is then very 
beautiful. 
MDCCCXXI. 
I 
