OF COPPER. 385 



ing of an aggregation of minute crystals ; these 

 were collected on a linen cloth and thoroughly 

 washed ; when dry they had rather a pale blue 

 colour. 100 parts of this salt, when kept for 

 some hours in the temperature of 140, lost, in 

 different trials, 9*5, 10, and 10*3 of its weight: 

 the residue, which had acquired a greenish tint, 

 was boiled for an hour with hydrate of barytes. 

 The filtered liquid, being freed from its excess of 

 barytes by a current of carbonic acid gas, was 

 evaporated to dryness, redissolved and thrown 

 down by sulphuric acid : the sulphate of barytes 

 weighed 84, equivalent to 35-593 of acetic acid. 

 The copper precipitated by iron was ignited in 

 a current of common air, and then reduced by 

 hydrogen gas : it gave 34*352 copper, equivalent 

 to 42-937 oxide of copper. In other experiments 

 he obtained 86-6 and 86-8 sulphate of barytes, 

 equivalent to 43-3 and 43-4 oxide of copper. 

 Hence, the constituents of the salt are 



Acetic acid 35-593 or 6-25 



Oxide of copper 43-212 - 7 588 

 Water . 21-195 - 3-?21 



1 00-000 



6-25 represents an atom of acetic acid, 7*588 

 differs little from 7*5, an atom and a half of ox- 

 ide of copper and 3*721 is not quite a third of an 

 atom more than 3-375, whicli represents 3 atoms 

 of water. Hence, the constituents of the salt are 



VOL. II. B b 



