398 
Proceedings of the Royal Society of Edinburgh. [Sess 
FIRST SPECIAL MEETING. 
Monday , 9th July 1917. 
Dr John Horne, Esq., LL.D., F.R.S. , F.G.S., President, in the Chair. 
The Makdougall-Brisbane Prize for the Biennial Period 1914-1916 was presented to 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. 
The Gunning Victoria Prize for the Quadrennial Period 1912-1916 was presented to Sir Thomas 
Muir, C.M.G., LL.D., F.R.S. , for his series of memoirs upon “The Theory and History of Deter- 
minants and Allied Forms,” published in the Transactions and Proceedings of the Society between 
the years 1872 and 1915. 
The following Communications were read : — 
1. The Origin, Rupture, and Closure of Ovarian Follicles. By Professor A. Robinson, M.D. 
2. Development of the Heart in Man. By Professor D. Waterston, M.D. 
3. Compound Determinants. By Professor E. T. Whittaker, F.R.S. 
4. Vanishing Aggregates. By Professor W. H. Metzler. 
5. A Further Contribution to our Knowledge of Platyzoma microphyllum , R.Br. By Dr J. 
M‘L. Thompson. 
