VI 
Contents. 
PAGK 
11. Studies in Clocks and Time-keeping: No. 1. Theory of the Maintenance of 
Motion. By Professor R. A. Sampson, F.R.S. Issued separately June 17, 
1918, .......... 75 
12. The Sound-Waves and other Air- Waves of the East London Explosion of January 
19, 1917. By Charles Davison, Sc.D., F.G.S. Communicated by The General 
Secretary. Issued separately June 17, 1918, . . . . . 115 
13. Phycomycetous Fungi from the English Lower Coal Measures. By David Ellis, 
Ph.D., D.Sc. (With One Plate and Eight Text-Figures.) Issued separately 
August 22, 1918, . . . . . . . . 130 
14. Note on the Construction of an Orthogonant. By Sir Thomas Muir, LL.D., 
F.R.S. Issued separately August 22, 1918, ..... 146 
15. The Formation of the Germ-Band in the Egg of the Holly Tortrix Moth, 
Eudemis nxvana (Hb.). By Miss L. H. Huie, F.E.S. Communicated by 
J. H. Ashworth, D.Sc., F.R.S. (From the Department of Invertebrate 
Zoology, University of Edinburgh.) (With Two Plates.) Issued separately 
September 26, 1918, . . . . . . .154 
L6. Mirage on the Queensferry Road. By Alexander G. Ramage. Issued separately 
September 26, 1918, ........ 166 
17. Studies in Clocks and Time-keeping: No. 2. Tables of the Circular Equation. 
By Professor R. A. Sampson, F.R.S. Issued separately October 3, 1918, . 169 
18. The Quadratic Relations between the Determinants of a 4-by-8 Array. By 
Sir Thomas Muir, LL.D., F.R.S. Issued separately January 31, 1919, . 219 
Appendix — 
Proceedings of the Statutory General Meeting, October 1917, . . . 229 
Proceedings of the Ordinary Meetings, Session 1917-1918, . . . 231 
Proceedings of the Statutory General Meeting, October 1918, . . . 235 
The Keith, Makdougall-Brisbane, Neill. Gunning Victoria Jubilee, and James 
Scott Prizes, ......... 237 
Awards of the Keith, Makdougall-Brisbane, Neill, and Gunning Prizes, . 240 
Accounts of the Society, Session 1917-1918, ..... 246 
The Council of the Society at October 1918, ..... 252 
Alphabetical List of the Ordinary Fellows of the Society, . . . 253 
List of Honorary Fellows of the Society at January 1, 1919, . . . 272 
List of Ordinary Fellows of the Society elected during Session 1917-1918, . 274 
Changes in Fellowship during Session 1917-1918, . . . . 274 
Additions to Library by Gift or Purchase, ..... 275 
Laws of the Society, . . . . . . . .281 
Index, ........ . . 288 
Index, under Authors’ Names, of Papers published in Transactions , . . . 291 
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