.'378 SALTS 



1 atom carbonic acid . 2 -7 5 



2 atoms peroxide of copper 1 



1 atom water . 1-12.5 



13-875 



(3.) The blue carbonate of copper occurs 

 crystallized in oblique rhombic prisms of a beau- 

 tiful blue colour. It has been repeatedly ana- 

 lyzed. I shall take the experiments of Mr. Phil- 

 lips as sufficiently exact to show the constituents 

 of this rather complicated salt. He found 100 

 parts of the crystals composed of 



, Peroxide of copper 69*08 



Carbonic acid 25-46 



Water 5-46 



100-00* 



Now, if we consider the salt as composed of 



2 atoms carbonate of copper 15-5 



1 atom protohyd rate of copper 6-125 



21-625 



we obtain the following for its constituents per 

 cent. 



Peroxide of copper 69'364 

 Carbonic acid 25-433 



Water 5-203 



100 

 Institution Journal, IV. 276. 



