new compound of chlorine and carbon. 397 
It is remarkable, that another of these compounds should 
be found so soon after the discovery of the two former chlo- 
rides of carbon. Its physical properties, and its chemical 
energies, are in every respect analogous to those of the former 
compounds ; and its constitution increases the probability, that 
another chloride of carbon may be found, consisting of two 
portions of chlorine and one of carbon. 
All the endeavours we have yet made to form the chlo- 
ride of carbon now described, or to convert it into either 
of the other chlorides, have been unsuccessful. We expected 
that when decomposed by heat, it would produce the proto- 
chloride with the liberation of carbon, as the perchloride does 
with the liberation of chlorine, but we have not yet been 
able to ascertain that point. We have only to offer as an 
apology for this and other imperfections in the present paper, 
the smallness of the quantity of this substance that we 
possessed. 
