288 : A. LIVERSIDGE. 
Without going into details, it may be mentioned that the paper 
referred to contained the results of experiments made with the 
object of ascertaining the condition in which the gold existed in 
certain rich specimens of mispickel, obtained from a mine near 
Orange in New South Wales ; these specimens were roasted in a 
muffle so as to drive off the arsenic and sulphur, and with the 
intention of afterwards dissolving away the iron oxide with hydro- 
chloric acid so as to ascertain whether the gold was crystallized ; 
on removing the specimens from the muffle, exudations of ochre 
coloured matter were seen on their surfaces. These exudations on 
closer examination were found to be gold in cauliflower-like 
aggregations, and under the microscope these were seen to be | 
made up of spicules and spirals of gold [See Plates 16, 17] (after- 
wards proved to contain some arsenic), the temperature of the 
muffle was kept between the fusing points of tin and zine, so as 
to make quite certain that it was never hot enough to fuse gold. 
The residual iron oxide never showed any traces of fusion. 
For these and other reasons I concluded, in my former paper, 
that the gold had not been fused ; my later experiments, however, 
show that although the temperature was insufficient to fuse gold, 
it was quite high enough to melt the very fusible compound of 
gold and arsenic, which was either present in the specimens under 
examination or formed during the roasting. 
In the Mineralogical Magazine for 1877 and following years, 
there are several communications from Mr. T. A. R. Readwin 
upon the formation of moss gold. He is of opinion that metallic 
growths of gold, silver, electrum and native copper take place at 
ordinary temperatures, and cites a number of cases of specimens in 
his cabinets which appear to have ‘“‘ grown ” since they have been 
in his possession. In the case of easily oxidisable sulphides rich 
in gold, this is probably not impossible. 
In the former paper an experiment is given in which gold was 
fused in a crucible with mispickel under borax ; on roasting the 
auriferous button moss gold was obtained as from the natural 
specimens but of much smaller dimensions. The following 
