XXX. ABSTRACT OF PROCEEDINGS. 



the opalescence may be due to the occurrence of fine 

 inclusions rather than cracks. 



2. Mr. G. W. Card exhibited from the Mining Museum, 

 (a) light oil from Papua ; (b) chrysotile from Beaconsfield, 

 Tasmania; (c) native bismuth from Kingsgate; (d) bismuth 

 telluride and native bismuth from Whipstick; (e) chalco- 

 pyrite from North Mount Lyell; (f) ores from the Boss 

 Mine, Nevada, yielding 100 ozs. Pt., 131 ozs. Pall., 81 ozs. 

 Au. per ton; (g) chrome mica from New Caledonia. 



Mr. L. A. Cotton gave an account of pendulum experi- 

 ments at Burrinjuck. 



Monthly Meeting, 14-th June, 1916. 

 Mr. J. B. Carne in the Chair. 

 Nine members and one visitor were present. 

 exhibits : 



1. Mr. O. A. Sussmilch exhibited (a) spherulitic rhyolite 

 of Carboniferous age from the Dungog Road; (b) Lepido- 

 dendron australe from Carboniferous (?) conglomerate on 

 Hudson Peak-Eld erslie Road, a coarse conglomerate inter- 

 stratified in tuffs; (c) Devonian sandstone from conglomerate 

 at Elderslie Bridge, near Branxton; (d) Radiolarian cherts, 

 aplitic types of granite and slates of the Jenolan area from 

 Branxton. 



2. Dr. W. N. Benson exhibited gold-bearing silicified 

 Permo-Carboniferous mudstone from Port Cygnet, and 

 porphyry in dolerite and tertiary alkaline rocks collected 

 by Professor Skeats. 



Mr. C. A. Sussmilch described the physiography of the 

 Barrington Tops and Lower Hunter : — 



Some notes on the Physiography of the Hunter River Valley. 



The valley of the Lower Hunter River has been cut out of a 

 tableland which has a general altitude of about 1,300 feet. The 



