ABSTRACT OF PROCEEDINGS. XXI. 



(2) Sections of Silver and Copper Nuggets. — The nugget of 

 native silver from Lake Superior, was not very much water-worn. 

 It contained a little calcite and some quartz in cavities, also a 

 little native copper. On slicing, polishing and etching it with 

 dilute nitric acid it presented a strongly marked crystalline struc- 

 ture closely resembling that seen in the West Australian gold 

 nuggets, figured in the Journ. Roy. Soc. N.S.W., 1897. 



A nugget of copper from Lake Superior, although studded with 

 crystals of silver externally, showed none in the etched section. 

 The silver crystals were imperfect rhombic dodecahedra about 

 one-eight inch across. This nugget of copper, as well as others, 

 from Bolivia and from Burra Burra, South Australia, showed an 

 internal crystalline structure somewhat similar to that of the 

 West Australian gold nuggets already referred to, but the crystals 

 nearly always radiate out from one or more centres, this was not 

 observed in any of the gold nuggets. 



(3) Stalactites and Stalagmites from the tunnel at the Prospect 

 Reservoir; these were collected by Mr. E. Hufton of the Chemical 

 Laboratory; the tunnel was built some twelve? years ago, and the 

 comparatively large size of the stalagmitic deposit — nearly two 

 inches in thickness — gives an idea of the rate of deposition of 

 calcium carbonate. The exhibitor believes they have been derived 

 mainly from the cement of the tunnel, inasmuch as he understands 

 that no limestone was used in its construction, nor is there any in 

 or about the reservoir. The catchment area is essentially of 

 sandstone and the water consequently poor in lime. 



Mr. J. F. Mann desires to make the following remarks on the 

 paper " Native Names of some of the Runs &c. in the Lachlan 

 District," by F. B. W. Woolrych (this Journ. xxiv., 63) communi- 

 cated by him. "On pages 65, 66, I make it appear that Cowal 

 Bugon is the correct native name for the extensive lake or swamp 

 locally known as Cowal Lake ; this statement is correct only to a 

 certain extent, and requires further explanation. 



"In the early days of settlement all swampy places were densely 

 covered with rushes, since greatly destroyed by cattle ; at certain 



