PROCEEDINGS 
/ 
V- 
ROYAL SOCIETY OF EDIN 
SESSION 1919-20 
Part II] 
YOL. XL. 
[Pp. 97-263 
CONTENTS. 
NO. PAGE 
XII. Molecular Energy in Gases. By Sir J. A. Ewing, K.C.B., 
F.R.S., . 102 
{Issued separately August 4, 1920.) 
XIII. On a Class of Graduation Formulae. By Catherine W. M. 
Sherriff, M.A., B.Sc. Communicated by Professor 
E. T. Whittaker, F.R.S., 112 
{Issued separately August 4, 1920.) 
XIV. An Identical Relation connecting Seven Vectors. By 
F. L. Hitchcock, Massachusetts Institute of Technology, 
Cambridge, Mass. Communicated by The General 
Secretary, 129 
{Issued separately October 13, 1920.) 
XV. The Harmala Alkaloids in Malaria. By J. A. Gunn, M.D., 
D.Sc., Professor of Pharmacology in the University of 
Oxford ; and Lt.-Col. D. G. Marshall, M.B., Lecturer on 
Tropical Medicine in the University of Edinburgh, . . *140 
{Issued separately October 13, 1920.) 
XVI. A Law of Force giving Stability to the Rutherford 
Atom. By J. Marshall, M.A., B.Sc., University College, 
Nottingham, . . . . . . . . .150 
{Issued Separately October 12, 1920.) 
XVII. The Explanation of an apparent Anomaly outstanding in 
the Results of Measurement of Dissociation Pressures. 
By Professor Alan W. C. Menzies, 158 
{Issued separately October 12, 1920.) 
[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 Fifteen Shillings. 
