Combinations of different Metals and Chlorine. 1 73 
A solution of 40 grains of cupranea in water, acidulated 
with muriatic acid, precipitated by iron afforded 18.8 grains of 
copper. 
And a solution of so grains of cupranea in water, precipi- 
tated by nitrat of silver, afforded 43 grains of horn silver. 
Hence 100 of cupranea, omitting the very slight loss, ap- 
pear to consist of 
53 chlorine 
47 copper 
100 
The deliquescent muriat and the native muriat of copper of 
Peru, belong to a class of compounds apparently distinct from 
the preceding combinations of copper and chlorine. 
The deliquescent salt is well understood ; and its composi- 
tion may be inferred, independent of its water, from that of 
cupranea. 
The native muriat is less known, I shall therefore relate 
the experiments I have made on this interesting mineral. 
The specimen I have examined is part of a very fine one, 
presented to Sir Humphry Davy by William Jacob, Esq. 
M. P. and deposited in the Museum of the Royal Institution. 
It consists of muriat and carbonat of copper, of red oxide of 
iron, and of green coloured quartz. The muriat is partly' 
crystallized ; the crystals, from the trials I have made of them, 
appeared to be pure, and they were, on that account, made the 
subject of my experiments. 
The crystallized muriat dissolves entirely and without effer- 
vescence, in all the acids in which I have tried it, and the 
deliquescent muriat of copper is in each instance formed, and 
