xxvi Minnies of Proceedings. 



Mi. T. Stewart exhibited specimens chiefly of igneous rocks from 

 Griqu aland West ; also of glacial conglomerate from Douglas, 

 which Mr. Dunn considers uniform with the Dwyka conglomerate of 

 the S. Karroo, although apparently very different. Mr. Dunn 

 explained the difference by the fact of upheaval of Zwartberg having 

 altered the rock. A crystal in one specimen is peculiar, as, if it was 

 a cr^'stal in existence before the conglomerate it would have been 

 rounded, which it was not. We cannot however at present, although 

 the rocks are dissimilar, assert that they are distinct. Mr. Stewart 

 also exhibited a rounded boulder that he had found in a stratum of 

 shale, which could scarcely have got there except by the transporting 

 power of ice It is necessary to have microscopical examination of 

 specimens before we can correlate the rocks in various parts of this 

 country. Mr. Stewart also exhibited rock specimens from Sutherland 

 similar to that at the bottom of Kimberley mine. This is interesting, 

 as it is said that one or more diamonds were once found at Sutherland. 

 Also specimen of manganese from Du Toit's Kloof. In South Africa 

 manganese always occurs in fissures where there has been much 

 movement up and down — brought up from below. 



Remarks and questions on the exhibits were made by Professor 

 MacOwan, Mr. Gamble, and Professor Guthrie. 



Mr. Stewart then read his paper on the '' Geology of the Cape 

 Peninsula." 



A discussion ensued, in which Professor MacOwan, Professor 

 Guthrie, Mr. Gamble, Mr. Bolus, and Archdeacon Lightfoot took 

 part. 



Mr. Gamble asked Mr. Stewart to explain why he considered the 

 granite to be more recent than the sandstone, for at first sight it 

 would appear as if the sandstone had been deposited indiscriminately 

 on both granite and clay-slate, the layers of sandstone being at much 

 the same level on both Table Mountain and Devil's Peak. 



Mr. Stewart explained that he had found cases where the upper 

 surface of granite had been altered by contact with the sandstone. 

 Tourmaline also is found, which is a strong proof of later formation 

 of granite. 



A vote of thanks to Mr. Stewart was proposed by the President, 

 and carried by acclamation. 



Ordinary Monthly Meeting. 



Thursday, July 1, 1886. 



PuGF. MacOwax, B.A., F.L.S., ix the Chaiu. 



1 )r. Gill exhibited on a screen and explained a number of photo- 

 frraplis, taken by Mr. 0. Pay Woods, of the instruments in use at the 

 Poyal Observatory. 



A vot(^ of thanks was accorded to Mr. Woods for his interesting 

 exhibition. 



The Secretary then read Mr. A. G. Howard's paper on '' The 

 Kolationship between Sun-spots and Terrestrial Storms." 



Mr. AVoods did not agree witli Mr. Howard's a(-c()unt of the nature 

 of sun-spots, and he pointed out, with regard to the connection 

 botwoeu suu-Bpt)tH and terrestrial magnetism, that magnetic storms 



