REPORTS AND PROCEEDINGS. 



Geological Society of London-. 



December 3, 1919.— Mr. G. W. Lamplugh, F.R.S., President ; and, 

 afterwards, Mr. R. D. Oldham, F.R.S., Vice-President, in the 

 chair. " 



Mr. S. Hazzledine Warren, F.G.S., exhibited and commented 

 on a collection of Neolithic implements from Graig-lwyd, near 

 Penmaenmawr (North Wales). 



Professor W. W. Watts, Sc.D., F.R.S., exhibited and described 

 a new geological map of Western Australia, prepared by the 

 Geological Survey of Western Australia, under the direction of 

 Dr. A. Gibb Maitland, F.G.S. 



Mr. C. N. Harris, Chairman of the Western Australian Com- 

 mittee of the Institution of Mining and Metallurgy and of the 

 Committee of Repatriation, exhibited a collection of minerals from 

 Western Australia which he had presented to the Imj)erial College 

 of Science and Technology, and commented chiefly on those of 

 economic interest. 



The President (Mr. G. W. Lamplugh) summarized briefly 

 the phenomena presented by the dry-lake areas of Western 

 Australia, illustrating his remarks with lantern-slides lent by the 

 Royal Geographical Society. He also exhibited sj)ecimens from 

 Permo-Carboniferous glacial deposits of the Irwin River district 

 (Western Australia). 



CORRESPONDENCE. 



THE SGUER OF EIGG. 



Sir, — Mr. Cunningham-Craig is good enough to read me a lecture 

 upon the importance of field-work and the danger of being misled 

 by theories. Had he read my paper before attacking it, he would 

 have seen that the theory which I took with me to Eigg was the 

 same which he is now defending, and it was the field evidence that 

 forced me to a different conclusion. 



He would have learnt, too, that the presence of granite fragments 

 in the agglomerate of Bidein Boidheach is no new discovery, but is 

 recorded both in my paper of 1906 and in the memoir on the " Small 

 Isles ". From the same and other sources he might have learnt 

 further that this is not an isolated occurrence. Fragments of both 

 gabbro and granite of Tertiary type are found in numerous volcanic 

 agglomerates in Skye, Rum, Mull, and Arran. These agglomerates 

 belong to a very early part of the volcanic succession, and are 

 themselves invaded by the gabbro and granite of the mountains. 

 The existence of this earlier plutonic series — nowhere exposed in 



