162 MR. BRODIE ON THE CHEMICAL NATURE OF A WAX FR03I CHINA. 
I. 0‘3775 gnu. of this salt gave 0'862 COg and 0'349 HO. 
II. 0’3625 grm. of this salt gave 0*833 CO 2 and 0*3385 HO, 
which correspond in 100 parts to — 
Carbon 
I. 
62*27 
11. 
62*74 
Hydrogen 
10*27 
10*38 
Oxygen and silver . . . 
27*46 
26*88 
100*00 
100*00 
I. 0*654 grm. of the same gave 0*135 grm. of silver. 
II. 0*629 grm. of the same gave 0*1305 grm. of silver. 
These correspond in parts per cent, to — 
I. 
Silver . . . 20*64 
II. 
20*74 
The formula of the silver salt of cerotic acid 
requires — 
C 54 . . . 
In 100 parts. 
62*66 
H 53 . . 
10*55 
0 , . . . 
6*19 
Ag. . . 
20*90 
100*00 
Sulphate of the Oxide of Cerotyle. 
When cerotin is treated in the cold with concentrated sulphuric acid, it is only 
acted on by the acid partially and at the surface. If the action be increased by heat, 
a reddening of the mass and decomposition take place. If however the cerotin be 
taken in a state of fine granular division, as obtained by crystallization out of ether, 
and in this condition acted upon by the acid, all decomposition is avoided and a per- 
fect combination takes place of the acid with the cerotin. The granular crystals are 
to be dried between blotting-paper, and then digested with the sulphuric acid, in the 
cold, for two or three hours, sufficient acid being added to render the mixture a rather 
fluid paste. The mass is to be thrown into cold water, and washed out with the 
same on a filter. As long as the solution is acid the wash-water will go through per- 
fectly clear, but when the acid is washed out it becomes slightly turbid. After the 
adhering acid has been thus removed, the substance may be dried in vacuo, and, 
when perfectly dry, dissolved in ether and crystallized out of that fluid. In this con- 
dition it is perfectly soluble even in water, and dissolves with the greatest facility in 
water to which the smallest quantity of alcohol has been added. When the solution 
in water has been evaporated to dryness at a low temperature, it remains in the form 
of a soft wax. 
I. 0*333 grm. of this substance gave 0*912 CO 2 and 0*3915 HO. 
II. 0*3317 grm. of this substance gave 0*9025 CO 2 and 0*3865 HO, 
