404 J. H. MAIDEN AND H. G. SMITH. 
appears that this insoluble substance contained in this resin is 
a body of some interest, and when sufficient of the exudation shall 
have been obtained, it will be desirable for its composition and 
constituents to be determined. For the present we are only able 
to describe it as ‘‘gummy substance” ? 
The collector (Mr. W. Biuerlen) says that, when fresh, this 
exudation is exceedingly sticky, hence the local name of the tree. 
Tt is not abundant, but is widely diffused, and well known locally 
because of its brilliant colour. It readily stains the fingers 4 
vermilion colour, and that, when dry, it reminded him of grass- 
tree gum (Xanthorrhea). 
GEOLOGICAL LABORATORY NOTES—No. 1. 
By J. Minne Curran. 
[Read before the Royal Society of N. S. Wales, November 6, 189%.] 
I—On Senentum Associatep witH Gop aNnp BisMvT#, 
. From Mount Hops, N. S. WALES. © 
Some twelve months ago I received a box of gold bearing stone 
from the Mount Allen Mine near Mount Hope, in this Colony: 
The stone was packed loosely, and on opening the case, @ peculiar 
smell suggestive of selenium was easily detected. The same odour 
could be produced at any time by shaking the stones together. 
The material is being mined for gold, and is part of an auriferous 
belt of slate, interbedded with Silurian slates to the north of 
Mount Hope. The slate is of a rich red ale colour, and splits 
readily into laminae, which correspond with, or are gene 
parallel to the original bedding planes. Occasionally strings 
knots of a harder clay-slate occur, not so bright in colour, ©” 
rather inclining toa chocolate brown. Through this last nodules — 
of quartz are sometimes developed. So far no sulphides = 
ad 
but 
