PROCEEDINGS 
OF THE 
ROYAL SOCIETY OP EDINBURGH. 
VOL. iv. 1861-62. No. 56. 
Seventy-Ninth Session. 
Monday, 25th November 1861. 
Dr CHRISTISON, V.P., in the Chair. 
The following Council were eleeted : — 
President. 
His Grace The DUKE OF ARGYLL, K.T. 
Vice-Presidents . 
Sir David Brewster, K.H. 
Dr Christison. 
Professor Kelland, 
Hon. Lord Neaves. 
The Very Rev. Dean Ramsay. 
Principal Forbes. 
General Secretary , — Dr John Hutton Balfour. 
Secretaries to the Ordinary Meetings , — Dr Playfair, Dr Allman. 
Treasurer , — J. T. Gibson-Craig, Esq. 
Curator of Library and Museum , — Dr Douglas Maclagan. 
Councillors. 
Dr Lowe. 
Professor W. J. M. Rankine. 
James Dalmahoy, Esq. 
Dr John Brown. 
Professor Fraser. 
James Leslie, Esq., C.E. 
Dr Schmitz. 
Dr Seller. 
E. W, Dallas, Esq. 
Rev. L. S. OrDe. 
Professor Tait. 
John Muir, Esq., D.C.L, 
3 R 
VOL. iv. 
