Keith, Brisbane, Neill, Gunning, and Scott Prizes. 413 
15th Biennial Pekiod, 1886-88. — Archibald Geikie, Esq., LL.D., for numerous Communica- 
tions, especially that entitled “ History of Volcanic Action during the Tertiary Period in the 
British Isles,” published in the Transactions of the Society. 
16th Biennial Period, 1889-90. — Dr Ludwig Beckkr, for his paper on “The Solar S[)ectrum at 
JUedium and Low Altitudes,” printed in vol. xxxvi. Part I, of the Society’s Transactions. 
17th Biennial Period, 1890-92. — Hugh Robert Mill, Esq., D.Sc., for his papers on “The 
Physical Conditions of the Clyde Sea Area,” Part I being already published in vol. xxxvi 
of the Society’s Transactions. 
18th Biennial Period, 1892-94.— Professor James Walker, D.Sc., Ph.D. , for his work on 
Physical Chemistry, part of which has been published in the Proceedings of the Society, vol. 
XX, pp. 255-263. In making this award, the Council took into consideration the work 
done by Professor Walker along with Professor Crum Brown on the Electrolytic Synthesis 
of Dibasic Acids, published in the Transactions of the Society. 
19th Biennial Period, 1894-96. — Professor John G. M'Kendrick, for numerous Physiological 
papers, especially in connection with Sound, many of which have appeared in the Society’s 
publications. 
20th Biennial Period, 1896-98. — Dr William Peddie, for his papers on the Torsional Rigidity 
of Wires. 
21st Biennial Period, 1898-1900. — Dr Ramsay H. Traquair, for his paper entitled “Reporton 
Fossil Fishes collected by the Geological Survey in the Upper Silurian Rocks of Scotland,” 
printed in vol. xxxix of the Transactions of the Society. 
22nd Biennial Period, 1900-02. — Dr Arthur T. Masterman, for his paper entitled “The 
Early Development of Crihrella ocwZato (Forbes), with remarks on Echinoderm Development,” 
printed in vol. xl of the Transactions of the Society, 
23rd Biennial Period, 1902-04. — Mr John Dougall, M.A., for his paper on “An Analytical 
Theory of the Equilibrium of an Isotropic Elastic Plate,” published in vol. xli of the 
Transactions of the Society. 
24th Biennial Period, 1904-06. — Jacob E. Halm, Ph.D., for his two papers entitled “Spectro- 
scopic Observations of the Rotation of the Sun,” and “ Some Further Results obtained with 
the Spectroheliometer,” and for other astronomical and mathematical papers published in 
the Transactions and Proceedings of the Society within the ])eriod. 
25th Biennial Period, 1906-08. — D, T. Gavynne-Vaughan, M.A., F.L.S., for his papers, 
1st, “ On the Fossil Osmundacese, ” and 2nd, “ On the Origin of the Adaxially-curved Leaf- 
trace in the Filicales,” communicated by him conjointly with Dr R. Kidston. 
26th Biennial Period, 1908-10, — Ernest MacLagan Wedderburn, M.A., LL.B., for his 
series of papers bearing upon “ The Temperature Distribution in Fresh-water Lochs,” and 
especially upon “The Temperature Seiche.” 
27th Biennial Period, 1910-12. — John Brownlee, M.A., M.D. , D.Sc., for his contributions 
to the Theory of Mendelian Distributions and cognate subjects, published in the Proceedings 
of the Society within and prior to the prescribed period. 
28th Biennial Period, 1912-14. — Professor C. R. Marshall, M.D., M. A., for his studies “On 
the Pharmacological Action of Tetra-alkyl-ammonium Compounds,” 
29th Biennial Period, 1914-16. —Robert Alexander Houstoun, Ph.D., D.Sc., for his series 
of papers on “The Absorption of Light by Inorganic Salts,” published in the Proceedings 
of the Society. 
30th Biennial Period, 1916-18. — Professor A. Anstruther Lawson for his Memoirs on “The 
Prothalli of Tmesipteris Tannensis and of Psilotum,^' published in the Transactions of the 
Society, together with previous papers on Cytology and on The Gametophytes of various 
Gynmosperms. 
31st Biennial Period, 1918-20. — Professor J. H. Maclagan Wedderburn of Princeton 
University for his Memoirs in Universal Algebra, etc., published in the Transactions and 
Proceedings of the Society, and elsewhere. 
III. THE NEILL PRIZE. 
1st Triennial Period, 1856-59. — Dr W. Lauder Lindsay, for his paper “ on the Spermogones 
and Pycnides of Filamentous, Fruticulose, and Foliaceous Lichens,” published in the Trans- 
actions of the Society. 
2nd Triennial Period, 1859-61. — Robert Kaye Greville, LL.D., for his contributions to 
Scottish Natural History, more especially in the department of Cryptogamic Botany, 
including his recent papers on Diatomaceie. 
