CONTENTS. 
PAGE 
1. Size, A Neglected Factor in Stelar Morphology. Opening Address by Professor 
F. 0. Bower, M.A , D.Sc , LL.D., F.R.S., F.L.S., President. Issued separately 
December 30, 1920, ........ 1 
2. On the Equations of Motion of a Single Particle. By J. H. M. Wedderburn, 
M.A., D.Sc. Issued separately January 24, 1921, . . . .26 
3. iEther and the Quantum Theory. By H. Stanley Allen, M.A., D.Sc. Issued 
separately January 24, 1921, . . . . . .34 
4. On the Transverse Galvanoinagnetic and Therm omagnetic Effects in several 
Metals. By F. Unwin, M.Sc. Communicated by Professor F. G. Baily, 
Issued separately March 17, 1921, . . . . . . 44 
5. Observations on the Interruption of the Endodermis in a Secondarily Thickened 
Root of Draccena fruticosa , Koch. By Annette G. Mann, B.Sc. Communi- 
cated by Professor F. O. Bower, F.R.S. Issued separately March 17, 1921, . 50 
6. On Fechner’s Law and the Self-Luminosity of the Eye. By Professor William 
Peddie, D.Sc. [Abstract], ....... 60 
7. The Relation of the Soil Colloids to the Thermal Conductivity of the Soil. By 
Capt. T. Bedford Franklin, B.A. (Cantab.). Issued separately May 9, 1921, 61 
8. On a Graphical Method of determining Shear Influence Lines and Diagrams of 
Maximum Shearing Force for a Beam subjected to a Series of Concentrated 
Rolling Loads. By Alex. R. Horne, B.Sc. (Lond.), Professor of Engineering, 
Robert Gordon’s Technical College, Aberdeen. Issued separately May 9, 
1921, .......... 68 
9. The Confluent Hypergeometric Functions of Two Variables. By Pierre 
Humbert. Communicated by Professor E. T. Whittaker, F.R.S. Issued 
separately May 9, 1921, ........ 73 
10. An Experimental Analysis of the Losses by Evaporation of Liquid Air con- 
tained in Vacuum Flasks. By Professor Henry Briggs, D.Sc., Ph.D., A.R.S.M. 
Issued separately June 20, 1921, . . . . . . . 97 
11. Note on a Continuant of Cayley’s of the Year 1874. By Sir Thomas Muir, F.R.S. 
Issued separately August 23, 1921, . . . . . .111 
