PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1920-21 
Part I] 
YOL. XLL 
CONTENTS. 
[FpJrS-.,^ 
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☆ JUN - 6 1921 
I. Size, A Neglected Factor in Stelar Morphology. O^&^g 0na | ^ 
Address by Professor F. O. Bower, M.A., D.Sc., 
F.R.S., F.L.S., President, 1 
( Issued separately December 30, 1920.) 
II On the Equations of Motion of a Single Particle. By J. H. M. 
Wedderburn, M.A., D.Sc., 26 
(. Issued separately January 24, 1921.) 
III. AEther and the Quantum Theory. By H. Stanley Allen, 
M.A., D.Sc., . . . 34 
(. Issued separately January 24, 1921.) 
IV. On the Transverse Galvanomagnetic and Thermomagnetic 
Effects in several Metals. By F. Unwin, M.Sc. Com- 
municated by Professor F. G. Bajly, .... 44 
(. Issued separately March 17, 1921.) 
V. Observations on the Interruption of the Endodermis in a 
Secondarily Thickened Root of Dracaena fruticosa, Koch. 
By Annette G. Mann, B.Sc. Communicated by Professor 
F. O. Bower, F.R.S., . 50 
{Issued separately March 17, 1921.) 
VI. On Fechner’s Law and the Self-Luminosity of the Eye. By 
Professor William Peddie, D.Sc. [Abstract], ... 60 
[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 Eleven Shillings. 
