-XXXli PROCEEDINGS OF THE GEOLOGICAL SOCIETY, [vol. lxxiv, 



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 

 was a pause during which fine-grained andesite-tuffs, with a 

 tendency to produce true slates, accumulated. This was succeeded 

 by a vast outpouring of andesites, of great thickness in the central 

 mountain -region, but dying out southwards and eastwards. Next 

 a series of peculiar mixed tuft's, of special value in mapping, was 

 covered by another mass of andesites dying out south-westwards. 

 After this, soda-rhyolites covered the whole district, nothing later 

 being preserved — with one possible known exception. These 

 volcanic rocks were intersected by a varied series of intrusions. 



The solfataric phenomena were of interest, including the produc- 

 tion of garnet and graphite, and a remarkable ' streaky ' structure 

 in the rhyolites. 



An important question related to the age of the large acid 

 intrusions associated with the volcanic rocks. Were they of the 

 same age as, or later than, the Devonian folding ? A sketch was 

 sriven of the evidence on which the Lecturer assigned the Eskdale 

 and Skiddaw granites to the Ordovician volcanic episode, and it Avas 

 suggested that the great Skiddaw anticline was not due to regional 

 folding, but a local structure connected with the vulcanicity. 



Lantern-slides of Lake-District countiy were shown, and the 

 manner in which the volcanic rocks entered into the scenery was 

 pointed out. 



A short discussion followed, and the thanks of the Fellows 

 present were accorded to Mr. Green for his Lecture. 



Rock-specimens and manuscript 6-inch maps were exhibited by 

 the Director of H.M. Geological Survey. 



A series of volcanic rocks from the Eifel District was exhibited 

 by James Francis, F.G.S. 



March 20th, 1918. 



Mr. G. W. Lamplugh. F.E.S., President, 

 in the Chair. 



Harry Muller, 12 West Park, Eltham (Kent), was elected a 

 Fellow of the Society. 



The List of Donations to the Library was read. 



The President referred with sorrow to the death, on March 18th, 

 of Dr. George Jennings Hinde, F.li.S., who had served the 

 Society for many years as a Member of the Council. The President 

 also recorded the loss of Capt. Lewis Moysky, M.B., R.A.M.C., 



