APPENDIX—KEITH, BRISBANE, NEILL, AND GUNNING PRIZES. 907 
3rd TRIENNIAL PaRiop, 1890—93.—ALExanDER BucHan, Hsq., LL.D., tor his varied, extensive, and 
extremely important Contributions to Meteorology, many of 
which have appeared in the Society’s Publications. 
47H TripnniaL Periop, 1893-96.—Joun Aitken, Esq., for his brilliant Investigations in Physics, 
especially in connection with the Formation and Condensation 
of Aqueous Vapour. 
1st QUADRENNIAL PeRiop, 1896-1900.—Dr T. D. Anpsrson, for his discoveries of New and 
Variable Stars. 
2nD QuUADRENNIAL PerRiop, 1900-04.—Sir James Dewar, LL.D, D.C.L, F.RS., &., for his 
researches on the Liquefaction of Gases, extending over the 
last quarter of a century, and on the Chemical and Physical 
Properties of Substances at Low Temperatures: his earliest 
papers being published in the Transactions and Proceedings 
of the Society. 
