PROCEEDINGS 
OF THE 
toAH 5 
1921 
'°»*1 KuS ^ / 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1918-19 
Part III] VOL. XXXIX. [Pp. 209-310 
CONTENTS. 
NO. PAGE 
XV. An Analysis of an Electron-Transference Hypothesis of 
Chemical Valency and Combination. By John Marshall, 
M.A., B.Sc., Scholar of Trinity College, Cambridge ; Lecturer 
in Mathematics, University College, Nottingham. Com- 
municated by Professor W. Peddie, D.Sc., .... 209 
{Issued separately January 8, 1920.) 
XVI. A “Duplex” Form of Harmonic Synthetiser and its Mathe- 
matical Theory. By J. R. Milne, D.Sc., .... 234 
( Issued separately January 29, 1 920.) 
Obituary Notice : — 
Sir James Alexander Russell, Kt., M.A., M.B., F.R.C.P.E., 
B.Sc. in Public Health, LL.D., J.P., D.L. By Thomas R. 
Ronaldson, M.B., F.R.C.P.E., 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 
[Continued on page iv of Cover. 
EDINBURGH: 
Published by ROBERT GRANT & SON, 107 Princes Street, and 
WILLIAMS & NORGATE, 14 Henrietta Street, Covent Garden, London, W.C. 2. 
Price Eight Shillings. 
