646 
NOTES AND ABSTRACTS IN CHEMISTRY AND PHARMACY. 
several times is entirely decomposed. From four analyses it results, that this 
compound contains three molecules of hydrated oxide of copper, and two mole¬ 
cules of phenol;— 
2(C g H g O), 3(Cu"H,0 2 ) 
From this compound, which contains 55*88 per cent, of oxide of copper, the 
water cannot be detached without entire decomposition. 
Fhenate of the Oxide of Mercury is obtained by double decomposition, as 
a precipitate of a bright orange colour, becoming brick-red after drying over 
sulphuric acid. This compound only dissolves in hydrochloric and nitric acids, 
and when treated with the latter, the solution assumes a bright golden-yellow 
colour. It contains 69*33 per cent, of hydrated oxide of mercury, and has the 
formula C g H g O, Hg0 2 H 2 . 
Fhenate of Quinine. —To prepare this new compound, 8*72 parts of sulphate 
of quinine and 3 parts of phenate of potash are dissolved separately in alcohol, 
and the solution of the sulphate added little by little to that of the phenate; 
after twenty-four hours the precipitated sulphate of potash is removed by fil¬ 
tration, and the liquid evaporated by a gentle heat, and crystallized. The phe¬ 
nate of quiniue forms fine needle crystals, almost insoluble in ether, very soluble 
in alcohol and acids, but insoluble in water. The compound gave by analysis 
76 69 per cent, of quinine ; while theory requires 77*51. The author regards 
it as the result of the union of a molecule of quinine with a molecule of 
phenol, and assigns to it the formula C 20 H 24 N 2 O 2 , C G H 6 0. 
The author considers it demonstrated,—1st, that phenol can easily enter into 
combination with the bases to form very definite compounds ; 2nd, that these 
compounds are simple juxtapositions of the molecules, because the individual con¬ 
stitution of each component is retained unchanged. 
Use of Phenate of Potash to Detect Water in Ether. —As dry phenate 
of potash is almost insoluble in anhydrous ether, while hydrated ether partially 
dissolves it, and the undissolved part, after some time, becomes reddish-brown, 
the author applies these characters to detect water in ether. By this means he 
has recognized the presence of so small a quantity as 2*5 parts of water in 1000 
of ether. 
The Silvering of Glass. 
Several methods have been published from time to time for coating mirrors 
and lenses with metallic silver by chemical deposition. Liebig recommends the 
following as being best suited for the purpose:— 
a. 1 part of nitrate of silver is dissolved in 10 parts of water. 
b. Pure nitric acid of commerce is saturated with carbonate of ammonia, 
and diluted until it has the density of 1*115 ; or, c, 242 grammes of sulphate of 
ammonia are dissolved in water, and the solution made up to 200 cubic centi¬ 
metres. 
cl. Solution of caustic soda, free from chlorine, of a density of 1*05. 
A. The Silver Solution. —This is prepared by adding 100 volumes of the solu¬ 
tion of ammoniacal salt (b or c) to 140 volumes of the solution of silver (a), and 
then 750 volumes of the solution of soda ( d ) in small successive portions. After 
three days’ repose, decant the bright liquor. 
e. 50 grammes of white sugar-candy, and 3*1 grammes of tartaric acid are dis¬ 
solved in a little water, and heated to ebullition for an hour, then diluted to 
500 cubic centimetres. 
f. 2*857 grammes of dry tartrate of copper are mixed with water, sufficient 
soda added, drop by drop, to effect solution, and then diluted to 500 cubic centi¬ 
metres. 
B. The Reducing Solution. —This is obtained by mixing equal volumes of 
e and /, and adding 8 volumes of water. 
