APPENDIX— KEITH, BRISBANE, NEILL, AND GUNNING PRIZES. 867 



11th Triennial Period, 1886-89. — Robert Kidston, Esq., for his Researches in Fossil Botany, pub- 

 lished in the Transactions of the Society. 



12th Triennial Period, 1889-92. — John Horne, Esq., F.G.S., for his Investigations into the Geolo- 

 gical Structure and Petrology of the North- West Highlands. 



13th Triennial Period, 1892-95. — Robert Irvine, Esq., for his papers on the action of Organisms 



in the Secretion of Carbonate of Lime and Silica, and on the 

 solution of these substances in Organic Juices. These are 

 printed in the Society's Transactions and Proceedings. 



IV. GUNNING VICTORIA JUBILEE PRIZE. 



1st Triennial Period, 1884-87. — Sir William Thomson, Pres. R.S.E., F.R.S., for a remarkable 



series of papers " on Hydrokinetics," especially on Waves 

 and Vortices, which have been communicated to the Society. 



2nd Triennial Period, 1887-90. — Professor P. G. Tait, Sec. R.S.E., for his -work in connection with 



the " Challenger " Expedition, and his other Researches in 

 Physical Science. 



3rd Triennial Period, 1890-93. — Alexander Buchan, Esq., LL.D., for his varied, extensive, and 



extremely important Contributions to Meteorology, many of 

 which have appeared in the Society's Publications. 



4th Triennial Period, 1893-96. — John Aitken, Esq., for his brilliant Investigations in Physics, 



especially in connection with the Formation and Condensation 

 of Aqueous Vapour. 



