COPPER. 417 



Copper 4-000 or 1 atom 

 Iron 3'543 - 1 atom 



Sulphur 4-170 - 2 atoms 



It is obvious, that copper pyrites is a compound 

 of 



1 atom sulphuret of copper 6 

 1 atom sulphuret of iron 5-5 



Thus, there are three sulphurets of copper ; 

 namely, 



COPPER. SULPHl'R. 



1. Disulphuret composed of 2 atoms + 1 atom. 



2. Sulphuret 1 atom + I atom. 



3. Bisulphuret 1 atom -f- 2 atoms. 



6. If 100 grains of peroxide of copper be Atom of 

 dissolved in muriatic acid, and 80 grains of cop- copper. 

 per filings be added to the solution, and the 

 whole agitated in a well stopped phial nearly 

 filled by the mixture, the copper filings are in- 

 stantly dissolved without the evolution of any 

 gas, and the liquid, which has become black and 

 opaque, is found to contain a solution of sub- 

 oxide of copper in muriatic acid. This experi- 

 ment, for which we are indebted to Mr. 

 Chenevix, but which I have frequently repeated, 

 demonstrates the composition of suboxide of 

 copper : for 1 00 grains of oxide of copper are 

 composed of 



Vor,. I. D cl 



