VI 
Contents. 
PAGE 
16. A Law of Force giving Stability to the Rutherford Atom. By J. Marshall, 
M.A., B.Sc., University College, Nottingham. Issued separately October 12, 
1920, .......... 150 
17. The Explanation of an apparent Anomaly outstanding in the Results of Measure- 
ment of Dissociation Pressures. By Professor Alan W. C. Menzies. Issued 
separately October 12, 1920, . . . . . . .158 
18. The Musical Scale. By Joseph Goold. Communicated by C. R. Gibson. Issued 
separately January 22, 1921, . . . . . . .161 
19. Thermometer Screens. By the late Dr John Aitken, F.R.S. (The paper was 
finished shortly before his death.) Communicated by Dr C. G. Knott, F.R.S. 
Issued separately January 24, 1921, . . . . . 172 
Obituary Notices : — 
Sir John Jackson, Kt., LL.D. By David Alan Stevenson, B.Sc., M.Inst.C.E,, . 182 
David Berry Hart, M.D., F.R.C.P.E., Librarian, Royal College of Physicians, 
Edinburgh. By J. W. Ballantyne, M.D., F.R.C.P.E., . . . 185 
Surgeon-General W. C. Gorgas. By Major-General W. B. Bannerman, M.D., 
D.Sc., .......... 187 
Obituary Notices of Fellows, Honorary and Ordinary. By The Assistant 
Secretary, ......... 191 
Appendix — 
Proceedings of the Statutory General Meeting, October 1919, . . . 199 
Proceedings of the Ordinary Meetings, Session 1919-1920, . . 203 
Proceedings of the Statutory General Meeting, October 1920, . . . 207 
List of Contributions to Special Subscription Fund, .... 208 
The Keith, Makdougall- Brisbane, Neill, Gunning Victoria Jubilee, and James 
Scott Prizes, ......... 210 
Awards of the Keith, Makdougall-Brisbane, Neill, and Gunning Prizes, . 213 
Accounts of the Society, Session 1919-1920, ..... 219 
The Council of the Society at October 1920, ..... 226 
Alphabetical List of the Ordinary Fellows of the Society ? . . .227 
List of Honorary Fellows of the Society at January 1, 1921, . . . 246 
List of Ordinary Fellows of the Society elected during Session 1919-1920, . 248 
Changes in Fellowship during Session 1919-1920, .... 248 
Additions to Library by Gift or Purchase, ..... 249 
Laws of the Society, ........ 253 
Index, . . . . . . . . . . 260 
Index, under Authors’ Names, of Papers published in Transactions , . . . 263 
