192 Reports & Proceedings — Geological Society of London. 



Following upon the great Caledonian crust-movements there was, 

 in the Scottish Highlands and elsewhere, a copious intrusion of 

 plutonic magmas, alL of "calcic" as contrasted with alkaline types. 

 The same characteristic "belongs to the igneous rocks of the Lower 

 Old Bed Sandstone, which were extruded and intruded in connexion 

 with the later Caledonian folding, while the country was still in 

 a condition of stress. With the dying out of this stress a more 

 alkaline facies supervened, and the Lower Carboniferous igneous 

 rocks of Scotland, though developed largely in the same synclinal 

 folds as the preceding series, present a strong contrast in petro- 

 graphical characters. They indicate a certain richness in soda, and 

 this feature becomes more pronounced, until it culminates in the 

 Permian of Ayrshire and East Fife in highly alkaline rock-types. 



In Southern England, remote from the main Caledonian dis- 

 turbance, the Devonian and Carboniferous lavas are of the same 

 spilitic type as those of the early Ordovician. Later, this part of the 

 British area was involved in the Hercynian crust-movements, which 

 were accompanied by the intrusion of the Cornish granites and their 

 satellites. 



In Mesozoic times our country experienced no orogenic disturbance 

 of a pronounced type, and there was a prolonged cessation of igneous 

 activity. The Tertiary Era introduced a new factor in the form of 

 very extensive plateau-faulting, bearing no relation to the structure 

 of the country. This movement, generally of the nature of subsidence, 

 affected a vast area, of which Northern Britain is only a small 

 fraction, and was attended by igneous action on the same extensive 

 scale. The mechanism of extrusion and intrusion differed in im- 

 portant features from that illustrated by the Palaeozoic eruptions. 

 The Tertiary igneous rocks, as a whole, are decidedly, though not 

 strikingly, rich in soda ; but this alkaline character is lost in the 

 neighbourhood of isolated centres, where there is evidence of locally 

 developed stresses of an acute type. 



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

 declared duly elected for the ensuing year : — 



Officers: President, Alfred Harker, M.A. , LL.D., F.R. S. Vice-Presi- 

 dents, R. Mountford Deeley, M. Inst.C. E. ; Edwin Tulley Newton, F.R.S. ; 

 Professor William Johnson Sottas, M.A., LL.D., Sc.D., F.R.S.;. and 

 Arthur Smith Woodward, LL.D., F.R.S., F.L.S. Secretaries, Herbert 

 Henry 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. 



Other Members of Council : Charles William Andrews, D.Sc, F.R.S. ; 

 Professor John Cadman, C.M.G., D.Sc, M.Inst.C.E. ; Professor Charles 

 Gilbert Cullis, D.Sc. ; Arthur Morley Davies, D.Sc, A.R.C.Sc ; Professor 

 Edmund Johnston Garwood, M.A., Sc.D., F.R.S. ; Walcot Gibson, D.Sc 

 Finlay Lorimer Kitchin, M. A., Ph.D. ; George William Lamplugh, F.R.S. 

 John Edward Marr, M.A., Sc.D., F.R.S. ; Richard Dixon Oldham, F.R.S. 

 Robert Heron Rastall, M.A. ; Professor Thomas Franklin Sibly, D.Sc. 

 Sir Jethro J. Harris Teall, M.A.. D.Sc, LL.D., F.R.S. ; and Samuel 

 Hazzledine Warren. 



