424 Proceedings of the Royal Society of Edinburgh. 
THE COUNCIL OF THE SOCIETY. 
October 1922 . 
President. 
Professor FREDERICK 0. BOWER, M.A., D.Sc., LL.D., F.R.S., F.L.S. 
V ice-Presidents. 
Principal Sir JAMES ALFRED EWING, K.O.B., M.A., D.Sc., LL.D., M.Inst.C.E., F.R.S., 
Principal, University of Edinburgh. 
Professor JOHN WALTER GREGORY, D.Sc., F.R.S., Professor of Geology, University of 
Glasgow. 
Major-General W. B. BANNERMAN, C.S.I., I.M.S., M.D., D.Sc. 
W. A. TAIT, D.Sc., M.InstC.E. 
Principal J. C. IRVINE, C.B.E., Ph.D., D.Sc., LL.D., F.R.S. 
The Right Hon. LORD SALVESEN, P.C., K.C. 
General Secretary. 
CARGILL G. KNOTT, D.Sc., LL.D., F.R.S. 
Secretaries to Ordinary Meetings. 
Professor J. H. ASHWORTH, D.Sc., F.R.S., Professor of Zoology, University, Edinburgh. 
Professor R. A. SAMPSON, M.A., D.Sc., F.R.S., Astronomer Royal for Scotland. 
Treasurer. 
JAMES CURRIE, M.A., LL.D. 
Curator of Library and Museum. 
A. CRICHTON MITCHELL, D.Sc., Hon. D.Sc. (Geneva). 
Councillors. 
Professor FRANCIS GIBSON BAILY, 
M.A., M.Inst.E.E. 
ROBERT CAMPBELL, M.A., D.Sc., F.G.S. 
Professor J. ARTHUR THOMSON, M.A., 
LL.D. 
HERBERT STANLEY ALLEN, M.A., D.Sc. 
Sir ROBERT BLYTH GREIG, M.A., LL.D., 
F.Z.S. 
JAMES RITCHIE, M.A., D.Sc. 
ERNEST MACLAGAN WEDDERBURN, 
M.A., LL.B., W.S., D.Sc. 
Professor THOMAS H. BRYCE, M.A., M.D., 
F.R.S. 
Professor JAMES YOUNG SIMPSON, M.A., 
D.Sc. 
Professor D’ARCY W. THOMPSON, C.B., 
D.Litt., F.R.S. 
Professor Sir JAMES WALKER, D.Sc., 
Ph.D., LL.D., F.R.S. 
Professor EDMUND TAYLOR WHIT- 
TAKER, Sc.D., F.R.S. 
Office Staff. 
Librarian and Assistant Secretary, G. A. STEWART. 
Assistant Librarian, ERNST. M. STEWART. 
Housekeeper, SAMUEL HEDDLE. 
