Vol. 50.] PROCEEDINGS OF THE GEOLOGICAL SOCIETY. ' 9 



as a broken vein of galena was found in close proximity. This 

 crocoisite was supposed to be a somewhat rare mineral, but he 

 had found it and also the native red oxide, minium, in several places 

 in South Africa. The most interesting specimen was, however, a 

 mass of diorite showing visible gold throughout the rock, an assay 

 of which gave upwards of 130 ounces of gold per ton. From 

 information obtained from the prospector who made the discovery, 

 he gathered that the deposit was a dyke of diorite running for a 

 considerable distance, about 8 feet in width, flanked on one side 

 by granite and on the other by slates. There were extensive 

 ancient workings extending to a depth of about 60 feet, and the 

 prospecting shafts had not gone much below that depth, so not 

 much information was obtainable at present. The diorite showed 

 a development of epidote, but little or no quartz ; and the gold 

 appeared to enter in an extraordinary manner into all of the com- 

 posing minerals. Mr. Alford hoped, after his next visit to Mashona- 

 land, to be in a position to lay before the Society more definite 

 information regarding these interesting rocks. 



The following communications were read : — 



1. ' On some cases of the Conversion of Compact Greenstones 

 into Schists.' By Prof. T. G. Bonney, D.Sc, LL.D., F.R.S., F.G.S. 



2. ' The Waldensian Gneisses and their Place in the Cottian 

 Sequence.' By J. Walter Gregory, D.Sc, F.G.S. 



In addition to the specimens described by Mr. C. J. Alford, the 

 following were exhibited : — 



Bock-specimens and microscope-sections, exhibited by Prof. T. G. 

 Bonney, D.Sc, LL.D., F.B.S., F.G.S., in iBustration of his paper. 



Rock-specimens and microscope-sections, exhibited by Dr. J. "W. 

 Gregory, F.G.S., in illustration of his paper. 



A series of Flint Implements from Broom Ballast-Hole, Hawk- 

 church, Devon, exhibited by the Bev. B. Ashington Bullen, B.A., 

 F.G.S. 



