33 
of Edinburgh , Session 1869-70. 
Brought forward, 289 
Dr John W. Johnston, Maurice Lothian, David Mac- 
Gibbon, Dr R. Craig Maclagan, Dr W. C. MTntosh, John 
Maclaren, Dr Henry Marshall, 0. G. Miller, John Pender, 
Rev. T. M. Raven, Dr W. Rutherford, J. L. Douglas 
Stewart, Yiscount Walden, Capt. T. P. White, . 26 
Deduct Deceased . — Dr Begbie, William Brand, Dr Dalzell, 
Professor Dyce, Principal Forbes, Rev. Dr Muir, Dr 
Penney, Dr Seller, James Wardrop, ... 9 
James Anstruther (formerly noticed), ... 1 
Resigned . — Dr A. E. Mackay, Bishop Morel), . . 2 
12 
Total Number of Ordinary Fellows at November 1869, 303 
Add Honorary and Non-Resident Fellows, . . 54 
Total, 357 
Monday , 20 th December 1869. 
Professor KELLAND, Vice-President, in the Chair. 
The Keith Prize for the Biennial Period ending May 1869, 
having been awarded by the Council to Professor P. G. Tait, for 
his paper “on the Rotation of a Rigid Body about a fixed point, ” 
which has been published in the Transactions, the Medal was 
delivered to him by the President at the commencement of the 
Meeting* 
The following Communications were read : — 
1. On the Geological Structure of some Alpine Lake-Basins. 
By Archibald Geikie, Esq., F.R.S. 
In this paper the author reviewed the arguments by which the 
geologists of Switzerland endeavour to prove that the so-called 
“orographic” lakes are essential parts of the architecture of the 
Alps. He showed from detailed sections of one or two lakes, parti- 
cularly of the Lake of the Four Cantons, that the amount of denuda- 
tion, which the surrounding rocks had suffered, demonstrated that 
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