i 70 Mr. J. Davy’s Account of some Experiments on the 
of this substance, I shall venture to call the compounds of the 
metals and chlorine to be treated of, by the names which my 
brother has proposed for them. 
1 . On the Combinations of Chlorine and Copper , &t\ 
There are two distinct combinations of chlorine and copper, 
both of which may be directly made by the combustion of this 
metal in chlorine gas. When the gas was admitted into an 
exhausted retort containing copper filings, the filings became 
ignited, a fixed fusible substance quickly formed, and the in- 
terior of the retort soon became lined with a fine vellowish 
%/ 
brown sublimate. The former substance evidently contains 
least chlorine, for when it was heated alone in chlorine gas, it 
absorbed an additional portion, and was converted into the 
latter. Hence the fixed compound may, in conformity with the 
principles of Sir Humphry Davy’s nomenclature, be called 
cuprane, and the yellow sublimate, cupranea. 
Cuprane may be procured in several other ways. It may 
be obtained by heating together copper filings and corrosive 
sublimate ; and it was thus first discovered by Boyle, who 
called it resin of copper, from its similitude to common resin. 
Two parts of corrosive sublimate, and one part of copper 
filings, I have found the best proportions of the materials. 
It may be obtained by boiling copper filings in muriatic acid, 
or by exposing slips of copper partially immersed in this acid 
to the atmosphere. In the last instance, I have found the 
changes connected with the formation of cuprane rather com- 
plicated ; the copper exposed receives oxygene from the at- 
mosphere, and acid from the ascending muriatic acid fumes, 
and is thus converted into a green insoluble salt, and this 
