a 5% 
? 
oti"s 
. . 
290 A. LIVERSIDGE. 
The above experiments however only show that an artificial 
mixture of gold and mispickel will yield moss gold. 
The next series of experiments was upon the preparation of 
sulpharsenide and arsenide of gold and the production of moss 
gold from them. 
Gold, Arsenic and Sulphur. 
Experiment 1.—A solution was made of sodium chloraurate and 
sodium arsenite and hydrogen sulphide passed ; the precipitate 
of the mixed sulphides of arsenic and gold and free sulphur, was 
dried and roasted, a cauliflower-like residue of gold was left similar 
to that exuded by auriferous mispickel, which under the microscope 
was seen to contain a few fine filaments. 
Experiment 2.—The experiment was repeated with the same 
result. 
Experiment 3.—Some of the mixed sulphide of gold and arsenic 
was compressed into small cylinders, by means of a steel diamond 
mortar and two of these were carefully roasted at the mouth of 
the muffle. In both cases the gold was left as a porous mass with 
sponge like perforations running through it in all directions— 
with filaments of gold, visible under the microscope. 
Gold and Sulphur. 
Experiment 4.—Some experiments were made in 1878, upon 
gold sulphide obtained by passing hydrogen sulphide through 
the solution of the sodium chloraurate, this sulphide on roasting 
yielded ordinary dull brown gold, but in parts it appeared to be 
more or less crystallized. This experiment was repeated more 
than once with the like results. ; 
Experiments with Gold and Arsenic. 
In making the arsenide of gold, in the first experiments in glass 
tubes, the gold foil was placed in a porcelain boat and the vapour 
of arsenic driven over it, but it was afterwards found that the 
boat could be dispensed with. A piece of hard glass three-quarter 
inch* combustion tubing was closed at one end and some metallic 
