188 Reports and Proceedings — Geological Society of London. 



and minute study of existing geographical conditions was strongly 

 advocated, as the key to the interpretation of the geological record ; 

 and it was urged that the utmost possible use should be made of 

 palseogeographical maps, both as a means of expressing ascertained 

 fact and as affording a focus for new critical investigation. 



The association of the phases of earth-movement with igneous 

 activity was next briefly treated, as also the connexion of movement 

 with rock-structure and existing physiography. 



Finally, geographical evolution was examined as the spur to organic 

 evolution, and it was urged upon palaeontologists that they should 

 endeavour to ascertain to what extent periods of slow or rapid 

 evolution corresponded with epochs of physical change. 



The Ballot for the Council and Officers was taken, and the following were 

 declared duly elected for the ensuing year : — COUNCIL : Henry A. Allen ; 

 Tempest Anderson, M.D., D.Sc. ; Charles William Andrews, B.A., D.Sc, 

 F.B.S. ; Henry Howe Arnold-Bemrose, J. P., Sc.D. ; George Barrow ; Professor 

 Thomas George Bonney, Sc.D., LL.D., F.K.S. ; Professor William S. Boulton, 

 B.Sc. ; James Vincent Elsden, D.Sc; John Smith Flett, M.A., D.Sc; 

 Professor Edmund J. Garwood, M.A. ; Sir Archibald Geikie, K.C.B., D.C.L., 

 LL.D., Sc.D., Pres.B.S. ; Alfred Harker, M.A., F.E.S. ; Bobert Stansfield 

 Hemes, M.A. ; Bedford McNeill, Assoc.B.S.M. ; John Edward Marr, Sc.D., 

 F.B.S. ; George Thurland Prior, M.A., D.Sc. ; Professor Sidney Hugh Beynolds, 

 M.A. ; Professor William Johnson Sollas, LL.D., Sc.D., F.B.S.; Aubrey 

 Strahan, Sc.D., F.B.S.; Herbert Henry Thomas, M.A., B.Sc; Professor 

 W. W. Watts, Sc.D., M.Sc, F.B.S. ; the Bev. Henry Hoyte Winwood, M.A. ; 

 and Arthur Smith Woodward, LL.D., F.R.S., F.L.S. 



Officers -.—President : Professor W. W. Watts, Sc.D., M.Sc, F.E.S. 

 Vice-Presidents: Charles William Andrews, B.A., D.Sc, F.B.S.; Alfred 

 Harker, M.A., F.B.S.; John Edward Marr, Sc.D., F.E.S.; Professor W. J. 

 Sollas, LL.D., Sc.D., F.B.S. Secretaries: Professor Edmund J. Garwood, 

 M.A.; Arthur Smith Woodward, LL.D., F.E.S., F.L.S. Foreign Secretary: 

 Sir Archibald Geikie, K.C.B., D.C.L., LL.D., Sc.D., Pres.B.S. Treasurer: 

 Aubrey Strahan, Sc.D., F.E.S. 



2. February 22, 1911.— Professor W. W. Watts, Sc.D., M.Sc, F.R.S., 

 President, in the Chair. 



The following communication was read : — 



"The Geology of the Districts of Worcester, Robertson, and 

 Ashton (Cape Colony)." By R. H. Rastall, M.A., F.G.S. 



After a brief description of the physiography of the district and the 

 general sequence of the rocks composing it, in which the incomplete- 

 ness of the stratigraphical record is especially noted, a detailed 

 account is given of the structure and characters of the Malmesbury 

 rocks of Worcester and the region near that town. These are shown 

 to include a lower and an upper sedimentary series, pi'edominantly 

 gritty and slaty respectively, and evidently of great thickness, 

 probably over 20,000 feet. The upper division is pierced by granitic 

 dykes, which have been subsequently crushed and foliated, forming 

 ' phyllite gneiss'. Certain bands of limestone are metamorphosed by 

 them to pure- white marble. A remarkable isolated mass of igneous 

 rock in Brewels Kloof appears to be intrusive, but the rock is 

 andesitic in character. A thin though conspicuous band of ottrelite- 

 schist has been found in Waai Kloof and in the Hex River Pass. All 

 these rock-types are described in detail. Similar but somewhat less 



