Reports & Proceedings — Geological Society of London. 191 



The President then presented the Balance of the Proceeds of the 

 Barlow-Jameson Fund to Mr. Henry Dewey, said : — 



Mr. Dewey, — The Proceeds of the Barlow-Jameson Fund have been 

 awarded to you in recognition of your services to Geology and as an 

 encouragement to you for the future. In the record of your geological 

 work the first place belongs to your researches in North Cornwall, where 

 you were engaged as an officer of the Geological Survey. There your 

 mapping led you to recognize a number of subdivisions of the Devonian 

 strata and to determine their natural sequence, and with this help you were- 

 able to demonstrate the existence of important overthrusts in that area. 

 The peculiar features of the ' pillow-lavas ' intercalated in the Upper- 

 Devonian also engaged your attention, and your paper on the 'spilitic 

 series', written in collaboration with Dr. Flett, has proved a valuable^ 

 contribution to petrology. Of not less consequence, of another kind, were 

 your paper on the Raised Beach of North Devon and that which you read 

 before this Society a year ago on the Origin of River-gorges in Cornwall 

 and Devon. Your removal from the West of England to the Thames 

 Valley introduced you to new problems, to which you have brought the- 

 same zeal and insight, and it is our hope that you will find in the present 

 award an incentive to further investigations in the field of Geology. 



The President proceeded to read his Anniversary Address, including 

 first obituary notices of Jules Gosselet (elected Foreign Member in 

 1885), J. W. Judd (el. Fellow 1865), J. H. Collins (el. 1869), 

 C. T. Clough (el. 1875), Clement Reid (el. 1875), Bedford McNeill 

 (el. 1888), H. Rosales (el. 1877), "W. E. Koch (el. 1869), C. Dawson 

 (el. 1885), T. de Courcy Meade (el. 1891), and others. 



The remainder of the Address dealt with some aspects of igneous 

 action in Britain, and especially its relation to crustal stress and 

 displacement. This relation appears not only in the distribution of 

 igneous activity in time and space, in the succession of episodes, the 

 habits of intrusions, etc., hut also in the petrographical facies of the 

 igneous rocks themselves. The cause of such relation was sought in 

 the existence of extensive inter-crustal regions in a partially molten, 

 state : that is, with some interstitial fluid magma, which must 

 normally be rich in alkaline silicates. There will be a continual 

 displacement of the interstitial magma from places of greater stress- 

 to places of less stress, and certain broad differences in chemical 

 composition are therefore to he expected between the igneous rocks 

 of orogenic belts and those erupted in connexion with gentle 

 subsidence.. 



The Archsean plutonic rocks were intruded in close relation with 

 powerful lateral thrust, and they accordingly include no alkaline 

 types ; but the Dalradian sediments were deposited in an area of 

 tranquil subsidence, and the lavas intercalated in them are of the 

 spilitic kind, rich in sodic felspars. 



The Lower Palaeozoic formations were laid down in a geosyncline, 

 which for a long time experienced merely a slow depression, and the 

 late Cambrian and early Ordovician eruptions, situated chiefly along 

 the 'borders of the ai'ea, had a pronounced sodic facies. In mid- 

 Ordovician times there entered a certain element of lateral thrust,, 

 and accordingly in the Llandeilian vulcanicity the spilitic type gave 

 place to the andesitic ; but the scattered outbreaks of Bala and 

 Silurian age often afford evidence of a reversion to the earlier facies. 



