VI 
Contents. 
PAGK 
12. On the Mode of Action of Metal Sols. By Professor C. R. Marshall. Issued 
separately October 20, 1919, . . . . . . .143 
13. Some Conditions influencing the Reaction Velocity of Sodium Nitrite on Blood. 
By Professor C. R. Marshall. Issued separately October 20, 1919, . . 149 
14. The Propagation of Earthquake Waves through the Earth, and connected 
Problems. By Professor C. G. Knott, D.Sc., LL.D. Issued separately 
October 21, 1919,. ........ 157 
15. An Analysis of an Electron-Transference Hypothesis of Chemical Valency and 
Combination. By John Marshall, M.A., B.Sc. Communicated by Professor 
W. Peddie. Issued separately January 8, 1920, .... 209 
16. A “Duplex” Form of Harmonic Synthetiser and its Mathematical Theory. By 
James Robert Milne, D.Sc. Issued separately January 29, 1920, . . 234 
17. Obituary Notice of Sir James Alexander Russell, Kt. By Dr T. R. Ronaldson, 243 
Appendix — 
Proceedings of the Statutory General Meeting, October 1918, . . . 251 
Proceedings of the Ordinary Meetings, Session 1918-1919, . . . 253 
Proceedings of the Statutory General Meeting, October 1919, . . 256 
The Keith, Makdougall-Brisbane, Neill, Gunning Victoria Jubilee, and James 
Scott Prizes, ......... 260 
Awards of the Keith, Makdougall-Brisbane, Neill, and Gunning Prizes, . 263 
Accounts of the Society, Session 1918-1919, ..... 269 
The Council of the Society at October 1919, . . .275 
Alphabetical List of the Ordinary Fellows of the Society, . . 276 
List of Honorary Fellows of the Society at January 15, 1920, . . . 295 
List of Ordinary Fellows of the Society elected during Session 1918-1919, . 297 
Changes in Fellowship during Session 1918-1919, .... 297 
Additions to Library by Gift or Purchase, .... 298 
Laws of the Society, ........ 301 
Index, ........... 308 
Index, under Authors’ Names, of Papers published in Transactions , . . 310 
