15 
Ordinary Meeting, November 2nd, 1869. 
J. P. Joule, LL.D., F.R.S., &c., President, in the Chair. 
William Boyd Dawkins, M.A., F.R.S., and Thomas Ed- 
ward Thorpe, Ph.D., were elected Ordinary Members of the 
Society. 
“ On a New Chromium Oxychloride,” by T. E. Thorpe, 
Ph.D., Assistant in the Laboratory of Owens College. Com- 
municated by Professor H. E. Roscoe, Ph.D., F.R.S. 
( Cl 
When chromyl dichloride Cr0 2 < q' prepared by heating 
a mixture of potassium dichromate, sodium chloride, and sul- 
phuric acid, is maintained at a temperature of 180° C.-190 0 C. 
in a sealed tube for three or four hours, it is almost completely 
converted into a black solid substance, and on opening the 
tube when cold a considerable quantity of free chlorine es- 
capes. By exhausting the tubes containing the liquid 
chloride before subjecting them to heat, I have ascertained 
that chlorine is the only gaseous product of this decomposi- 
tion. The black compound invariably contains more or less 
of the liquid chloride which has escaped decomposition : the 
greater part of this is easily expelled on gently heating the 
mass after opening the tube. In order to free it completely 
from the latter body the black substance was transferred to 
Pboceeding-s— Lit, & Phil. Society. — Yol. IX. — No. S. — Session 1869-70. 
