CONTENTS. 
32 - 
1. Notices of Fellows, Honorary and Ordinary, recently deceased. By The General 
Secretary. Issued separately January 31, 1920, .... 
2. The Cooling of the Soil at Night, with Special Reference to Late Spring Frosts 
(II). By Captain T. Bedford Franklin, B.A. (Cantab.). Communicated by 
The General Secretary. Issued separately February 3, 1920, . 
3. Note on the Determinant whose Matrix is the Sum of Two Circulant Matrices. 
By Sir Thomas Muir, M. A., LL.D., F.R.S. Issued separately February 3, 1920, 
4. Note on Mr Quilter’s Photographs of Mirage. By The General Secretary. Issued 
separately February 23, 1920, ....... 
5. The Absorption of X-Rays. By Dr R. A. Houstoun, Lecturer on Physical 
Optics in the University of Glasgow. Issued separately February 23, 1920, . 
6. Note on the Scattering of X-Rays. By Dr R. A. Houstoun, Lecturer on Physical 
Optics in the University of Glasgow. Issued separately March 25, 1920, 
7. An Unnoticed Point in the Theory of Newton’s Rings. By J. Marshall, M.A., 
B.Sc., University College, Nottingham. Communicated by Professor W. 
Peddie, D.Sc. Issued separately March 25, 1920, .... 
8. The Effect of Weather Changes on Soil Temperatures. By Captain T. Bedford 
Franklin, B.A. (Cantab.). Issued separately March 25, 1920, 
9. On the Quaternionic System as the Algebra of the Relations of Physics and 
Relativity. By Professor W. Peddie. Issued separately May 29, 1920, 
10. Note on Pfaffians with Polynomial Elements. By Sir Thomas Muir, M.A., 
LL.D., F.R.S. Issued separately May 29, 1920, .... 
11. The Daily Temperature Curve. By L. Becker, M.A., Ph.D., Professor of 
Astronomy in the University of Glasgow. Issued separately August 4, 1920, 
12. Molecular Energy in Gases. By Sir J. A. Ewing, K.C.B., F.R.S. Issued separ- 
ately August 4, 1920, „ ...... 
13. On a Class of Graduation Formuhe. By Catherine W. M. Sherriff, M.A., B.Sc. 
Communicated by Professor E. T. Whittaker, F.R.S. Issued separately 
August 4, 1920, ......... 
14. An Identical Relation connecting Seven Vectors. By F. L. Hitchcock, Massa- 
chusetts Institute of Technology, Cambridge, Mass. Communicated by The 
General Secretary. Issued separately October 13, 1920, 
15. 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. Issued 
separately October 13, 1920, ....... 
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