Comlinations of different Metals and Chlorine, &c. 7 



weight by exposure to a temperature above 300 Fahren- 

 heit. 



Since honi silver contains 24*5 per cent, of chlorine*, 

 60 grains of cuprane appear to contain 5i'2grains of cop- 

 per and ^S'S of chlorine. And 100 appear to consist of 



36 chlorine 



64 copper 



100 



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 20 grains of cnpranea in water, preci- 

 pitalcd by nitrat of silver, afforded 43 grains of horn silver. 

 Hence 100 of cupranea, omitting the very slight loss, 

 •appear to consist of 



53 chlorine 

 47 copper 



100 



The deliquescent reuriat and the native murlat 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 com- 

 position mav be inferred, independent of its water, from 

 that of cnpranea. 



The native niuriat 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 Humphrv Davy by William Jacob, Esq. 

 M.P. and deposited in the JNIuseum of the Royal Institution. 

 It consists of miM'iat and carl)onat of copper, of red oxide 

 of iron, and of srreen coloured quartz. The muriat is 

 partly crystallii^ed { the cr\ stals, from the trials I have made 

 of them, appeared to be pure, and they were, on that ac- 

 count, made the subject of my experiments. 



The crvstallized munat dissolves entirely and without 

 efferve-xence, in all the acids in which I have tried it, and 

 the deliquescent muriat of copper is in each instance 

 formed, and a combination of brown oxide of copper with 

 the acid employed. 



• This I hare ascertained by synthes's ; 13 grains of pure silver dissolved 

 in niiric acid, and piecipitateJ with niurial of ammonia, yielded 15-9 p:rain» 

 of fu»ed horn silver. I do not give the particulars of the experiment, 

 which wak very carefully made ; liecKUsc the result very nearly agrees with 

 that of Klaprotii, and of other che:nie[s. 



A 4 Heated 



