Reports & Proceedings — Geological Society of London. 187 



In resigning the ctiaii', the President expressed liis thanks to the 

 Pellows of the Society, and especially to the Officers, who, as well 

 as the permanent oilicials, had contributed much to the smooth 

 working of the Society's business. 



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

 declared dnXy elected for the ensuing year : — 



Officers (who are also ex-officio members of the Council) : President : 

 •George William Lamplugh, F.R. S. Vice-Presidents: R. Mountford 

 Deeley, M.Inst.C.E. ; Alfred Harker, M.A., LL.D., F.R.S. ; Professor 

 William Johnson Sollas, M.A., LL.D., Sc.D., F.R.S. ; and Sir Jethro 

 J. H. Teall, M.A., LL.D., D.Sc, F.R.S. Secretaries: Herbert Fenry 

 Thomas, M.A., Sc.D. ; and Herbert Lapworth, D.Sc, M.Inst.C.E. 

 Foreign Secretary: Sir Archibald Geikie, O.M., K.C.B., D.C.L., LL.D., 

 Sc.D., F.R. S. Treasurer: James Vincent Elsden, D.Sc. 



CouJS'CiL : Charles William Andrews, D.Sc, F.R.S.; Francis Arthur 

 Bather, M.A., D.Sc, F.R.S. ; Professor John Cadman, C.M.G., D.Sc, 

 M.Inst.C.E. ; Arthur Morley Davies, D.Sc, A.R.C.Sc. ; Professor Edmund 

 Johnston Garwood, M.A., Sc.D., F.R.S. ; John Frederick Norman Green, 

 B.A. ; Finlay Lorimer Kitchen, M.A., Ph.D. ; Major Henry George Lyons, 

 D.Sc, F.R.S.; Professor John Edward Marr, M.A., Sc.D., F.R.S. ; 

 Richard Dixon Oldham, F.R.S. ; Robert Heron Rastall. M.A. ; Professor 

 Henry Hurd Swinnerton, D.Sc. ; Samuel Hazzledine Warren; Professor 

 William Whitehead Watts, M.A., Sc.D., LL.D., F.R.S. 



2. March 6, 1918.— Mr. G. W. Lamplugh, F.ll.S., President, in the 



Chair. 



Mr. J. F. N. Green delivered a lecture on the Igneous Pocks of the 

 Lake District. He first drew attention to some of the manuscript 

 6 in. maps of the Lake District, prepared nearly fifty years ago, by 

 the Geological Survey, and pointed out that, although undoubtedly 

 most accurate, they differed greatly in the volcanic area from his 

 own. He suggested that the reason was that there was a funda- 

 mental difference in the classification of tuffs and lavas. A large 

 proportion of the Lake District rocks were brecciated, and had been 

 supposed to be altered tuffs. With the unbrecciated rocks into 

 which they passed they had been mapped as ashes. A number of 

 specimens and photographs were shown, indicating that the breccia- 

 tion and apparent bedding were due to flow. Specimens were also 

 shown of explosion breccias, of the normal tuffs (which the Lecturer 

 believed to be mainly the result of erosion between eruptions), and 

 of rocks simulating true tuffs, but actually sandstones and con- 

 glomerates, composed of detrital igneous material. Attention was 

 drawn to the criteria for distinguishing the various types. Recently 

 manuscripts bad been found in the possession of the Geological 

 Survey proving that Aveline, whose maps were extraordinarily 

 accurate and detailed, had anticipated by thirty years the Lecturer's 

 separation from the volcanic rocks of the basal beds of the Coniston 

 Limestone Series. 



When re-raapped on tliis basis, the Borrowdale Series appeared as 

 a simple and regular sequence, strongly folded and cropping out in 

 long bands. An interesting history of vulcanicity was revealed, 

 beginning in many places with explosion tuffs followed by a great 

 series of pyroxene-andesites over the whole district. Then there 



