7G8 APPENDIX — KEITH, BRISBANE, NEILL, AND GUNNING PRIZES. 



18th Biennial Period, 1861-G3. — Professor William Thomson, of the University of Glasgow, for his 



Communication " on some Kinematical and Dynamical 



Theorems." 



19th Biennial Period, 1863-C5. — Principal Forbes, St Andrews, for his "Experimental Inquiry into 



the Laws of Conduction of Heat in Iron Bars," published in 

 the Transactions of the Society. 



20th Biennial Period, 18G5-C7. — Professor C. Piazzi Smyth, for his paper "on Eecent Measures at 



the Great Pyramid," published in the Transactions of the 

 Society. 



2 1st Biennial Period, 1867-69. — Professor P. G. Tait, for his paper " on the Rotation of a Rigid 



Body about a Fixed Point," published in the Transactions of 

 the Society. 



22nd Biennial Period, 1869-71. — Professor Clerk Maxwell, for his paper "on Figures, Frames, 



and Diagrams of Forces," published in the Transactions of the 

 Society. 



23rd Biennial Period, 1871-73. — Professor P. G. Tait, for his paper entitled "First Approximation 



to a Thermo-electric Diagram," published in the Transactions 

 of the Society. 



24th Biennial Period, 1873-75. — Professor Crum Brown, for his Researches " on the Sense of Rota- 

 tion, 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 Rhom- 



bohedral Carbonates," and " on the Felspars of Scotland," 

 published in the Transactions of the Society. 



26th Biennial Period, 1877-79. — Professor H. C. Fleeming Jenkin, for his paper "on the Appli- 

 cation of Graphic Methods to the Determination of the Effi- 

 ciency 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 Chrtstal, for his paper "on the Differential 



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 communications, 



extending over several years, on subjects connected with 

 Ocean Circulation, Compressibility of Glass, &c. ; 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. 



3 1st 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. 



