42 Reporh and Proceedings — Geological Society of London. 



The Pleistocene deposits, including Glacial drifts, are described 

 in various districts in the southern and midland counties of England, 

 in South Wales, in the Highlands of Scotland, in Skye, and 

 Caithness. Especially interesting is the account of the high-level 

 and other drifts near Macclesfield in Cheshire. The more recent 

 deposits have also received attention. In the petrographical work 

 we note a special account of the remarkable assemblage of eruptive 

 rocks which has been detected in Assynt, and of the metamorphism 

 induced by them on the surrounding dolomites. Thus it is shown 

 that the marbles of Assynt are mainly altered dolomites. 



The palgeontological work has largely assisted the stratigraphical 

 work, and aid has been given by Mr. E. Kidston in naming the 

 Carboniferous plants of Berwickshire, and by Dr. Traquair in 

 naming the Silurian fishes of Lesmahagow. 



The important catalogue of type and figured fossils preserved in 

 the Museum of Practical Geology, commenced in the Summary of 

 Progress for 1899, is continued by the publication of the lists of 

 Pleistocene, Pliocene, and Devonian specimens. 



DBIBI^OI^TS .A.3^X) I^-S-OGIBIBXDinrsrG-S. 



Geological Society of London. 



I.— November 20th, 1901.— J. J. H. Teall, Esq., M.A., V.P.E.S., 



President, in the Chair. 



Dr. Vaughan Cornish, in exhibiting Photographs of Waves and 

 Ripples in Water, Cloud, Sand, and Snow, said that he need only 

 refer to the photographs showing the action of wind upon snow, 

 which were the most recent of the series of pictures which he was 

 exhibiting that evening. He had spent from December to March, 

 last Winter studying the snow in the provinces of Quebec, Manitoba, 

 and British Columbia. When the wind blew one saw the processes 

 of wind-erosion and of the accumulation of drifted material pro- 

 ceeding with a rapidity which is not attained when wind acts 

 upon heavier or harder materials. He particularly commended to 

 geologists the study of wind-erosion of snow hardened by pressure 

 and low temperature. The cutting and carving, and the revelation 

 of previously invisible stratification, went on at a surprising rate, and 

 one could see the structures change from form to form under one's 

 very eyes, and thus quickly gain such an insight into the processes 

 of wind-erosion as, in the case of more stubborn rock, could only be 

 obtained by prolonged study. The advantage, moreover, of studying 

 the process in snow was not merely one of time, but consisted partly 

 in the recognition of transitional stages which were so apt to be 

 missed when observations were necessarily intermittent, as was the 

 case with those of erosion of harder rocks. 



The following communications were read : — 

 1. " Notes on the Genus Lichas." By Frederick Eichard Cowper 

 Eeed, Esq., M.A., F.G.S. 



