264 Proceedings of the Eoyal Society of Edinburgh. 
23rd Biennial Period, 1871-73. — Professor P. G. Tait, for his paper entitled ‘ ‘ First Approxi- 
mation to a Thermo-electric Diagram,” published in the Transactions of the Society. 
24th Biennial Period, 1873-1875. — Professor Crum Brown, for his Researches “on the Sense of 
Rotation, and on the Anatomical Relations of the Semicircular Canals of the Internal Ear.” 
25th Biennial Period, 1875-77.— Professor M. Forster Heddle, for his papers “on the 
Rhombohedral Carbonates,” and “on the Felspars of Scotland,” published in the Transac- 
tions of the Society. 
26th Biennial Period, 1877-79.— Professor H. C. Fleeming Jenkin, for his paper “on the 
Application of Graphic Methods to the Determination of the Efficiency of Machinery,” 
published in the Transactions of the Society ; Part II having appeared in the volume for 
1877-78. 
27th Biennial Period, 1879-81. — Professor George Chrystal, for his paper “ on the Differ- 
ential Telephone, ” published in the Transactions of the Society. 
28th Biennial Period, 1881-83. — Thomas Muir, Esq., LL.D., for his “Researches into the 
Theory of Determinants and Continued Fractions,” published in the Proceedings of the 
Society. 
29th Biennial Period, 1883-85. — John Aitken, Esq., for his paper “on the Formation of 
Small Clear Spaces in Dusty Air,” and for previous papers on Atmospheric Phenomena, 
published in the Transactions of the Society. 
30th Biennial Period, 1885-87. — John Young Buchanan, Esq., for a series of communica- 
tions, extending over several years, on subjects connected with Ocean Circulation, 
Compressibility of Glass, etc.; two of which, viz., “On Ice and Brines,” and “ On the 
Distribution of Temperature in the Antarctic Ocean,” have been published in the Proceedings 
of the Society. 
31st Biennial Period, 1887-89. — Professor E. A. Letts, for his papers on the Organic 
Compounds of Phosphorus, published in the Transactions of the Society. 
32nd Biennial Period, 1889-91.— R. T. Omond, Esq., for his contributions to Meteorological 
Science, many of which are contained in vol. xxxiv of the Society’s Transactions. 
33rd Biennial Period, 1891-93. — Professor Thomas R. Fraser, F.R.S., for his papers on 
Strophanthus hispidus, Strophanthin, and Strophanthidin, read to the Society in February 
and June 1889 and in December 1891, and printed in vols. xxxv, xxxvi, and xxxvii of 
the Society’s Transactions. 
34th Biennial Period, 1893-95. — Dr Cargill G. Knott, for his papers on the Strains produced 
by Magnetism in Iron and in Nickel, which have appeared in the Transactions and 
Proceedings of the Society. 
35th Biennial Period, 1895-97. — Dr Thomas Muir, for his continued communications on 
Determinants and Allied Questions. 
36th Biennial Period, 1897-99. — Dr James Burgess, for his paper “on the Definite Integral 
JLf 
v4» e 
of the Society. 
■ : - t2 dt, with extended Tables of Values,” printed in vol. xxxix of the Transactions 
37th Biennial Period, 1899-1901. — Dr Hugh Marshall, for his discovery of the Persulphates, 
and for his Communications on the Properties and Reactions of these Salts, published in the 
Proceedings of the Society. 
38th Biennial Period, 1901-03. — Sir William Turner, K.C.B., LL.D., F.R.S., etc., for his 
memoirs entitled “A Contribution to the Craniology of the People of Scotland,” published in 
the Transactions of the Society, and for his “ Contributions to the Craniology of the People 
of the Empire of India,” Parts I, II, likewise published in the Transactions of the 
Society. 
39th Biennial Period, 1903-05. — Thomas H. Bryce, M.A., M.D., for his two papers on “The 
Histology of the Blood of the Larva of Lepidosiren paradoxa,” published in the Transactions 
of the Society within the period. 
40th Biennial Period, 1905-07. — Alexander Bruce, M.A., M.D., F.R.C.P.E., for his paper 
entitled “Distribution of the Cells in the Intermedio-Lateral Tract of the Spinal Cord,” 
published in the Transactions of the Society within the period. 
41st Biennial Period, 1907-09. — Wheelton Hind, M.D., B.S., F.R.C.S., F.G.S., for a paper 
published in the Transactions of the Society, “ On the Lamellibranch and Gasteropod Fauna 
found in the Millstone Grit of Scotland.” 
42nd Biennial Period, 1909-11. — Professor Alexander Smith, B.Sc., Ph.D., of New York, 
for his researches upon “Sulphur” and upon “Vapour Pressure,” appearing in the 
Proceedings of the Society. 
