228 Miscellaneous Intelligence. 
concentrates his must by boiling, and adds the proper quantity 
of chalk to the liquor, while it is still hot. Even acid wine may 
be benefited by the addition of chalk. Oyster-shells, we be- 
lieve, have been frequently used with this view; and calcined 
oyster-shells are a cleaner carbonate of lime than common 
chalk.—Jour. de Phys., May, 1822. 
3. Analysis of Verdigris—Betore verdigris is pressed into 
cakes it is in the form of light blue acicular crystals of a silky 
lustre, which, by the action of water, are resolved into a soluble 
acetate, and an insoluble subacetate of copper, the latter being 
decomposed by the action of cold water, which gradually changes 
it into a brown powder; whether it is thus totally resolved into 
oxide of copper, or whether it remains a subsalt, Mr. R. Phillips, 
the author of these researches, has not ascertained. 
To find the quantity of acetic acid, 100 parts of the crystals 
were boiled in water with lime, and the solution, when filtered, 
was submitted toa current of carbonic acid to precipitate ex- 
cess of lime; it was then heated to drive off superfluous car- 
bonic acid, and the neutral acetate of lime thus obtained was 
decomposed by carbonate of soda; the carbonate of lime thus 
precipitated weighed, when washed and dried, 28.3 parts. 
To ascertain the proportion of peroxide of copper, 100 parts 
of the blue crystals were heated with dilute nitric acid, and the 
nitrate of copper thus formed being decomposed by a red heat, 
left 43.25 parts of peroxide of copper. The equivalent of acetic 
acid, in reference to hydrogen as =1, being 50, and that of 
carbonate of lime also 50, the quantity of the latter obtained 
in the above experiments indicates that of the acetic acid, 
which, added to the oxide, gives as the composition of the 
silky blue crystals, 
Experiment Theory 
Aceticacid . . 28.30=1 proportional 50 =27.17 
Peroxide of copper 43.25=1 a 80 =43.47 
Water. . . : 28.4525 i 54 =29.36 
100. 184. 100. 
Mr. Phillips found the green decomposable powder obtained 
by acting upon the silky crystal by water, to be a subacetate 
consisting of 
1 proportional of acid . oo gtk es ae re 
Pr peroxide ofcopper . . 80x2=160 
210 
The water retained a binacetate in solution. 
It appears therefore that there are the following peracetates 
of copper, which, independent of water, are composed as 
follows : 
