216 Proceedings of the Royal Society of Edinburgh. [Sess. 
2. On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed, Aberdeen- 
shire. Part IV : Restorations of the Vascular Cryptogams, and discussion of their bearing on the 
General Morphology of the Pteridophyta and the Origin of the Organisation of Land-Plants. 
Part V : The Thallophyta occurring in the Peat- Bed ; the succession of the Plants throughout a 
Vertical Section of the Bed, and the conditions of Accumulation and Preservation of the Deposit. 
By Dr R. Kidston, F.R.S., and Professor W. H. Lang, D.Sc., F.R.S. Trans., vol. lii, pp. 
831-854, 855-902. 
NINTH ORDINARY MEETING. 
Monday , June 6, 1921. 
Professor Frederick 0. Bower, M.A., D.Sc., LL.D., F. R.S. , F.L.S., President, in the Chair. 
By request of the Council, Lt.-Col. Wm. Glen Liston, M.D., Indian Medical Service, gave 
an address on “ Plague and Rats.” 
A vote of thanks to Col. Liston was proposed by the President, seconded by Major-Gen. 
Bannerman, and carried unanimously. 
The President announced the award of the Gunning Victoria Jubilee Prize to Mr C. T. R. 
Wilson, F. R.S., in recognition of his important discoveries in relation to Condensation Nuclei, 
Ionisation of Gases, and Atmospheric Electricity ; and the Makdougall-Brisbane Prize for the 
Period 1918-1920 to Professor J. H. Maclagan Wedderburn, M.A., D.Sc., for his many 
valuable memoirs in universal algebra which he has published in the Society’s Transactions 
and Proceedings and elsewhere. One of these papers, ‘'On the Equations of Motion of a Single 
Particle,” falls within the period of award. 
The Prizes will he presented at the Meeting on July 4. 
TENTH ORDINARY MEETING. 
Monday , June 20, 1921. 
Professor Frederick 0. Bower, F.R. S. , and afterwards Professor R. A. Sampson, F.R. S., 
Vice-President, in the Chair. 
The following Ordinary Fellows were admitted and signed the Roll : — Professor Norman 
Kemp Smith, Dr Nelson Annandale, and Mr Ian Bartholomew. 
The President announced that the Council had approved of the following nominations for 
Honorary Fellowship of the Royal Society of Edinburgh : — 
British. 
William Henry Perkin, F.R.S., Waynflete Professor of Chemistry in the University of 
Oxford; Sir Ronald Ross, K.C.B. , K.C.M.G., F.R.S., Consultant in Malaria, Ministry of 
Pensions, London; Sir Ernest Rutherford, Kt., F.R. S., Cavendish Professor of Experimental 
Physics in the University of Cambridge; Sir Jethro J. H. Teall, Kt., F.R.S., lately Director 
of the Geological Survey of Great Britain and of the Museum of Practical Geology. 
Foreign. 
Reginald Aldworth Daly, Professor of Geology, Harvard University, Cambridge, Mass. ; 
Johan Hjort, Director of Norwegian Fisheries, Bergen; Charles Louis Alphonse Laveran, 
Nobel Laureate, Medicine, 1907, Paris ; Heike Kamerlingh Onnes, Nobel Laureate, Physics, 
1913, Leiden, Holland; Salvatore Pincherle, Professor of Mathematics in the University of 
Bologna. 
The following Communications were submitted : — 
1. The Annual Incidence of Intelligence and its Measurement by the American Army Tests. 
By Mungo M'Callum Fairorieve, M.A. Proc., vol. xli, pp. 150-153. 
2. Shackleton Antarctic Expedition, 1914-1917: Geological Observations in the Weddell Sea 
Area. By J. M. Wordie, M.A. , F.G.S. Communicated by Professor J. W. Gregory, F.R.S. 
Trans., vol. liii, pp. 17-27. 
3. On the Criterion for Stable Flow of a Fluid in a Uniform Channel. By Hyman Levy, 
M.A., D.Sc. Proc., vol. xli, pp. 136-147. 
4. The Genus Clisiophyllum. By Professor P. Macnair, F.G.S., and Colin M. Leitch, 
O.B.E., B.Sc. 
5. Exhibition of Lantern Slides by Dr Nelson Annandale, Director Zoological Survey of 
India. 
