| eee th, 
| , 
292 A. LIVERSIDGE. 
partly due to the arsenic being volatilized by contact with the 
fluid alloy. See experiment No. 9. 
Experiment 5.—In the next experiments for the formation of 
the gold arsenide, arsenic was filled intoa hard glass three-quarter 
inch tube to the depth of one to one and a half inch and a plug of 
glass wool placed upon it, the gold plate or foil was next dropped 
in, followed by another plug of glass wool, the tube was then 
rendered vacuous, sealed and heated to redness in a combustion 
furnace. On cooling, the spirals of gold were seen to have fused 
down into one large globule one-third inch across, scattered about 
were a number of small globules which were flattened and attached 
to the glass tubing, extending over two inches of the length of the 
tube, this scattering seems to have taken place on the solidifica- 
tion of the large globule and was probably due to the expulsion 
of an excess of arsenic. This experiment was repeated with a 
similar result ; in the next experiment mispickel was used as the 
source of arsenic. On cupellation the first globule yielded 90:367% 
of gold and 9-64 of arsenic (by difference). ‘The globule of gold 
arsenide from the mispickel yielded only 1:82'% of arsenic. 
It was afterwards found that the combination could be brought 
about by heating the arsenic and gold, separated by an asbestos 
plug, in an ordinary small hard,glass tube of one-quarter inch bore, 
in the first trial the alloy melted down into a pear shaped globule, 
which was very brittle, and crystalline. On cupellation, the loss 
was equal to 554% of arsenic. 
Experiment 6.—Next °411 g. of pure gold was treated asin the 
last experiment, on removal from the lamp after I thought it 
had solidified, the globule still remained fluid, for an air bubble was . 
seen to slowly make its way through the globule, (as in a tube | 
containing mercury) the globule solidified immediately, but the 
channel caused by the bubble was left. In this channel, minute 
spicules and spiral filaments of gold (moss gold) were seen when 
examined under the microscope. 
