254 Proceedings of the Boyal Society of Edinburgh. [Sess. 
FOURTH ORDINARY MEETING. 
Monday, February 3, 1919. 
Dr John Horne, F.R.S. , F.G.S., President, in the Chair. 
The following Communications were read : — 
1. The Stelar Anatomy of Platyzoma microphyllum , R. Br. By Dr J. M‘Lean Thompson. 
( With Lantern Illustrations.) Trans., vol. lii, pp. 571-595. 
2. The Comparative Anntomy of the Shoulder Girdle and Pectoral Fin of Fishes. By Capt. 
E. W. SH4NN, B.Sc. Communicated by Professor W. C. M‘Iniosh, F.R.S. Trans., vol. lii, 
pp. 531-570. 
3. Note on the Determinant of the Primary Minors of a special set of ( n - l)-by-n Arrays. By 
Sir Thomas Muir, F.R.S. Proc., vol. xxxix, pp, 35-40. 
Lieut. L. W. G. Malcolm signed the Roll, and was duly admitted a Fellow of the Society, 
FIFTH ORDINARY MEETING. 
Monday , March 3, 1919. 
Dr John Horne, F.R.S., F.G.S., President, in the Chair. 
The Annual Election of Fellows took place. The following were elected : — Arthur Robertson 
Cushny, William John Dundas, Robert Owen Morris, Thomas Stewart Patterson, B. D. 
Porritt, Alfred Henry Roberts, William Alexander Robertson, Alexander Scott, 
Alexander Ritchie Scott, William Wright Smith, David Alan Stevenson. 
The following Communications were read : — 
1. Lantern Demonstration of Colour Blindness ; showing w'hat the colour-blind see. By 
Charles R. Gibson. 
2. On the Thermodynamics of Unstable States. By Professor W. Peddie. 
3. On Hamilton’s Principle and the Modified Function in Analytical Dynamics. By G. H. 
Livens, M.A. Communicated by Professor Whittaker. Proc., vol. xxxix, pp. 113-119. 
SIXTH ORDINARY MEETING. 
Monday , May 5, 1919. 
Dr John Horne, F.R.S., F.G.S., President, in the Chair. 
The Council have awarded : — The Makdougall-Brisbane Prize for the Biennial Period 1916-1918 
to 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 Gymnosperms. 
This Prize will be presented at the June Meeting. 
The following Communications were read 
1. Some Conditions influencing the Reaction-velocity of Sodium Nitrite on Blood. By Pro- 
fessor C. R. Marshall. Proc., vol. xxxix, pp. 149-156. 
2. On the Mode of Action of Metal Sols. By Professor C. R. Marshall. Proc.., vol. xxxix, 
pp. 143-148. 
3. Factors of Circulants. By Professor W. H. Metzlek. Proc., vol. xxxix, pp. 41-47. 
4. The Cooling of the Soil at Night. By Captain T. Bedford Franklin, B.A. Cantab. 
Communicated by The General Secretary. Proc., vol. xxxix, pp. 120-136. 
5. An Analysis of an Electron Transference Hypothesis of Chemical Valency and Combination. 
By John Marshall, AT. A., B.Sc. Communicated by Professor W. Peddie. Proc., vol. xxxix, 
pp. 209-233. 
Dr William John Dundas, Mr Alfred H. Roberts, Professor Arthur Robertson 
Cushny, and Dr Thomas Stewart Patterson, signed the Roll, and were duly admitted Fellows 
of the Society. 
