Minutes of Proceedings. iii 



<l They may exist nevertheless, but if they were as numerous as they 

 were in the Scandinavian Drift, they would have been discovered ere 

 this." Some members would remember that Mr. Dunn exhibited 

 some pebbles with such striae on them at the meeting of the Society 

 held on the 24th of June, 1885. Unfortunately their minutes did not 

 say where Mr. Dunn had found them, and whether they had been 

 taken out of the rock or picked up loose on the surface. It appeared 

 that the latter was the case. Two other cases he knew for certain, 

 viz., one specimen figured in Dr. Stapff s paper on the Dwyka con- 

 glomerate, which was found by Mr. Dunn on the farm Elandsfontein, 

 near Griquatown, and two others found by Dr. Schenck near the con- 

 fluence of the Vaal and Orange Eivers. These specimens, however, 

 which he exhibited were taken out of the weathering rock by himself 

 not far from the homestead of the farm Hard Castle, on the banks 

 of the Orange Eiver, about twelve miles above Prieska. As no such 

 authenticated find seemed to have been made before, he thought the 

 matter of sufficient importance to bring it before them. 



Dr. Corstorphine said he would not take these stones as evidence 

 of the glacial origin of the Dwyka conglomerate, the scratches on 

 them not showing the characters of glacial striations. 



The Chairman said he had not at all advocated the glacial theory. 

 He did not pretend to form a theory on the origin of the conglomerate. 

 He exhibited these stones simply as they might support Mr. Oldham's 

 views. 



Dr. Corstorphine promised to bring some genuine ice-scratched 

 stones to the next meeting, which could be compared with those 

 already exhibited. 



The Chairman said he would be very pleased if Dr. Corstorphine 

 would do so. Opinions differed on the matter. 



Dr. Corstorphine showed specimens of the rocks from Kimberley 

 and Johannesburg. The relations of the diamond-bearing rock and 

 the surrounding strata were illustrated by a diagrammatic section, and 

 the nature of the various rocks described. The main features of the 

 Johannesburg section were then described, and a short reference 

 made to the importance of a thorough survey of the Rand before 

 anything could be settled as to the further outcrop of the main reef 

 and other gold-bearing reefs. 



Mr. Stewart, in proposing a vote of thanks to Dr. Corstorphine, 

 said the specimens shown were very interesting as showing the 

 various kinds of rock and reef from which valuable minerals were 

 obtained, and threw some light upon the gold-bearing properties of 

 Witwatersrand. The question that was full of interest was where 

 all this gold came from. Certainly the strata of the Rand mines 



