384 SALTS 



about ith of an atom, doubtless owing to the 

 presence of a little hygrometrical water. It is 

 obvious, then, that the constituents of the salt 

 are 



1 atom acetic acid . 6*25 



1 atom oxide of copper 5 



1 atom water . . 1-125 



12-375 



8. The pigment called verdigris, occurs some- 

 times of a green colour and sometimes of a blue. 

 From the analysis of Mr. Phillips, with which 

 that of Berzelius corresponds, we find it a com- 

 pound of 



1 atom acetic acid . 6-25 



2 atoms oxide of copper 10 



6 atoms water . . 6*75 



23 



Berzelius extracted from verdigris, or diacetate 

 of copper, as it may be called, two different salts, 

 the one soluble in water, the other insoluble. 



9. The soluble salt was obtained by evaporat- 

 ing a solution of verdigris in distilled water by a 

 very gentle heat, until the greater part of its sa- 

 line contents were deposited : by applying heat 

 the whole was dissolved, and the solution was 

 mixed with alcohol. In about an hour a bulky 

 gelatinous looking mass was deposited, consist- 



