36 On a new Compound of Chlorine and Carlon. 
ride of silver, which, according to Dr. Wollaston’s scale, equal 
1-45 of chlorine; hence the two grains gave chlorine .. 1-45 
carbon .. 483 
1-933 
The loss here is 0-067, which is by no means important, when 
the small quantity of the substance and the nature of the experi- 
ments are cousidéred. 
As to the proportion of these two bodies to each other, if we 
consider chlorine as represented by 33-5, and carbon by 5:7, or 
with Dr. Wollaston by 44:1 and 7:5, then the 1°45 of chlorine 
would be equivalent to 0°2466 of carbon. This is the constitu- 
tion of the fluid or proto-chloride of carbon; and if we double 
the 0:2466, the product 0-4932 approaches so near to the ex- 
perimental result 0°483, that we do not hesitate to regard this 
compound as consisting of one portion of chlorine and two por- 
tions of carbon, or 
Chiorme "sos 44-1 33°5 
Carhon’ * 627028" ORS 11-4 
It is remarkable, that another of these compout.ds should be 
found so soon after the discovery of the two former chlorides of 
carbon. Its physical properties, aud its chemical energies, are 
in every respect analogous to those of the former compounds ; 
and its constitution increases the probability, that another chlo- 
ride of carbon may be found, consisting of two portions of chlo. 
rine and one of carbon, 
All the endeavours we have vet made to form the chloride of 
carbon now described, or to convert it into either of the other 
chlorides, have been unsuccessful. We expected that, when de- 
composed 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 imper- 
fections in the present paper, the smallness of the quantity of 
this substance that we possessed. 
VIM. Table of the periodical Variation of the Star Algol, from 
February to December 1822, inclusive. 
To Dr. Tilloch. 
Sirk, — As1 conceive every gentleman attached to astronomical 
pursuits is in the habit of seeing your excellent monthly publica- 
tion, it is probable that the insertion of the followmg Table of 
the periodical variation of A/gol may enable some of your readers 
to amuse themselves with the observation of that curious phe- 
nomenon. ‘The table has been long since printed in Bode’s 
Ephemeris 
