VI 
Contents. 
PAGK 
12. On the. Old Red Sandstone Plants showing Structure, from the Rhynie Chert 
Bed, Aberdeenshire. 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 Thallo- 
phyta occurring in the Peat Bed ; the Succession of the Plants throughout a 
Vertical Section of the Bed, and the Conditions of Accumulation and Preser- 
vation of the Deposit. By R. Kidston, LL.D., D.Sc., F.R.S., and Professor 
W. H. Lang, D.Sc., F.R.S. Issued separately August 23, 1921 [Abstract], . 117 
13. The Adsorption of Gas under Pressure. By Henry Briggs, D.Sc., Ph.D., * 
A.R.S.M., and William Cooper, M.A., B.Sc. Issued separately August 23, 
1921, .......... 119 
14. Utilisation of Solid Caustic Soda in the Absorption of Carbon Dioxide. By 
Elizabeth Gilchrist, M.A., B.Sc., A.I.C. Communicated by Professor Henry 
Briggs, D.Sc., Ph.D. Issued separately September 5, 1921, . . . 128 
15. On the Criterion for Stable Flow of a Fluid in a Uniform Channel. By H. 
Levy, M.A., D.Sc., Assistant-Professor of Mathematics, Imperial College of 
Science, South Kensington. Issued separately December 13, 1921, . . 136 
16. Note on Conditions for Mirage on the Queensferry Road. By Alex. G. Ramage. 
Issued separately December 13, 1921, ...... 148 
17. The Annual Incidence of Intelligence, and its Measurement by the American 
Army Tests. By M. M‘Callum Fairgrieve, M.A. Issued separately December 
13, 1921, .......... 150 
18. Experiments with an Electrified Pith Ball in an Ionised Atmosphere. By 
Dr Dawson Turner and Mr D. M. R. Crombie. Issued separately December 
13, 1921, .......... 154 
Obituary Notices : — 
Robert Munro, M.A., M.D., LL.D. By Dr George Macdonald, C.B., . . 158 
John George Bartholomew, LL.D. (Edin.), F.R.G.S., Geographer and Carto- 
grapher to the King. By Geo. G. Chisholm, M.A., B.Sc., Reader in 
Geography, Edinburgh University, Secretary to the Royal Scottish Geo- 
graphical Society, . . . . . . . .170 
John Aitken, LL.D., F.R.S. By C. G. Knott, D.Sc., LL.D., F.R.S., 177 
Yves Delage. By Professor J. H. Ashworth, F.R.S., .... 182 
Edward William Prevost, Ph.D., F.I.C. By Dr Henry Barnes, O.B.E., M.D., . 184 
Sir Thomas R. Fraser. By Harry Rainy, M.A., M.D., F.R.C.P. Ed., . .186 
T. Lindsay Galloway, M.A., F.G.S., A.M.Inst.C.E., M.Inst.M.E. By Professor 
W. P. Ker, F.B.A.; M.A., . . ... . . .193 
Henry Barnes, O.B.E., M.D., LL.D. Contributed by his daughter, Miss E. 
Barnes, ......... 195 
Obituary Notices of Fellows, Honorary and Ordinary. By Mr George A. 
Stewart, Assistant Secretary, . . . . . • .197 
