PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
vol. vm. 1872-73. No. 85. 
Ninetieth Session. 
Monday , 2d December 1872. 
Sir EOBEET CHEISTISON, Bart., President, in the Chair. 
The following Council were elected 
President. 
Sir ROBERT CHRISTISON, Bart., M.D., D.C.L., LL.D. 
Honorary Vice-President. 
His Grace the DUKE of ARGYLL. 
Vice-Presidents. 
The Hon. Lord Neaves. I Sir W. Stirling-Maxwell, Bart. 
Professor Sir William Thomson. Professor W. J. Macquorn Rankine. 
Principal Sir Alex. Grant, Bart. | David Milne Home, LL.D. 
General Secretary — Dr John Hutton Balfour. 
Secretaries to Ordinary Meetings. 
Professor Tait. 
Professor Turner. 
Treasurer — David Smith, Esq. 
Curator of Library and Museum — Dr Maclagan, 
Councillors. 
Rev. Thomas Brown. 
James Dewar, Esq. 
Professor Kelland. 
Professor Lister. 
George Robertson, Esq., C.E. 
Captain T. P. White. 
A 
James Donaldson, Esq. 
Dr Thomas R. Fraser. 
Dr Arthur Gamgee. 
Alexander Buchan, Esq. 
Prof. A. Dickson. 
James Leslie, Esq., C.E. 
VOL. VIII. 
