ABSTRACT OF PROCEEDINGS. XX XI. 



quartz-garnet-magnetite rock; magnetite bearing pegma- 

 tite ; pyritous albite aplite replacing schist; laminated 

 quartz in dynamically metamorphosed pegmatite. 



6. Dr. C. Anderson, (for Australian Museum) exhibited 

 in illustration of his paper: — Artificial alum crystal speci- 

 mens of ribbon scheelite and wolfram, and chrysotile veins 

 in serpentine. 



paper: 



Dr. 0. Anderson contributed a t ,aper on "Crystal Pres- 

 sure and its Geological Significance," in which he described 

 the experiments of Becker and Day and of Professor S. 

 Taber, and expounded Professor Taber's views on the origin 

 of asbestiform minerals and on the mechanism of vein 

 formation. In Taber's opinion the pressure of growing 

 crystals, by virtue of which they push the walls of a vein 

 apart, is a force of orogenic magnitude, and has played an 

 important part in forming metalliferous and other veins. 

 A discussion followed. 



MontJily Meeting, 12th November, 1919. 



Mr. J. E. Oarne, f.g.s.. Government Geologist, in the 

 Chair. 



Nine members were present. 



Mr. R. H. Cambage exhibited a sample of salt from the 

 Bargo and Nepean Rivers, near Picton, the site of the 

 discovery made by early explorers on 25th January, 1798. 



Mr. W. R. Browne quoted an example of a small hanging 

 valley on the bank of the Darling River near Wilcaunia, 

 which, he thought, shows as such only when the river is 

 low. 



Mr. Browne also suggested that tributaries flowing 

 along the strike may form boat-hook bends, which, there- 

 fore, may not always be evidence of capture by the rivers 

 into which the tributaries flow. 



X— December 3, 1919. 



