558 PROCEEDINGS. 
paper, namely :—“ Alteration product after Dyscrasite, compo- 
sition chiefly chloride of silver and antimoniate of silver.” A 
small area of the polished surface has been etched by means of 
strong ammonia. The chloride of silver has thus been removed, 
leaving the antimoniate of silver in relief. ‘ Alteration product 
after argentiferous Galena, composition chiefly sulphate of lead 
and sulphide of silver, in variable proportions.” One side of the 
small polished piece has been etched by means of a solution of 
acetate of ammonia. The sulphate of lead has thus been removed 
leaving the sulphide of silver in relief. He also exhibited a 
Specimen from the White Cliffs near Wilcannia. It consisted of 
a water-worn boulder of Devonian sandstone (containing typical 
Devonian fossils), found in the Upper Cretaceous rocks at the opal 
mines. Qne half of the boulder had been subjected to the action 
of thermal silicious waters, with the result that that part of the 
stone had been completely vitrified, and the fossils had been con- 
verted into precious opal. 
WEDNESDAY, JULY 1, 1895. 
Prof. T. W. E. Davin, B.a., F.Gs., President, in the Chair. 
Thirty members and one visitor were present. 
The minutes of the preceding meeting were read and confirmed. 
The certificates of five new candidates were read for the third 
time, and of three for the first time. 
The following gentlemen were duly elected ordinary members 
of the Society -— 
Barraclough, 8. H., B.E., M.M.E.; Glebe Point. 
Bensusan, A. J., A.R.S.M., F.c.s.; Burwood. 
Jacob, a ies A.M.1.C.E.; Dulwich Hill. 
Nicholls, W. H: ; Gosford. 
Van de Velde, Clement, c.z.; Sydney. 
ae FN a rae pae NL ERE St ee i Be yew hea ia aed HRs enh po 
The President made the following announcements :— 
1. The death of the Rt. Hon. Prof, Huxley, rns. P.c., who ¥# 
elected an Honorary Member of the Society in 1879, and 
was awarded the Clarke Medal in 1880. 
