TRANSACTIONS OF THE SECTIONS. 



Section A.— MATHEMATICAL AND PHYSICAL SCIENCE. 



THURSDAY, SEPTEMBER 12. 



Page 

 Address by Captain W. de W. Abney, C.B., R.E., F.R.S., F.R.A.S., Presi- 

 dent of the Section 481 



1. Fifth Report of the Committee for promoting Tidal Observations in 



Canada 488 



2. Report of the Committee for preparing Instructions for the practical Work 



of Tidal Observation 488 



3. Fifth Report of the Committee for the Harmonic Analysis of Tidal Ob- 

 servation 488 



4. On the Heliocentric Longitudes of Come tic Perihelia. By Henry Mttir- 

 HEAD, M.D., LL.D 488 



5. On Cometic Nebulae. By Professor A. W. Ruckee, M.A., F.R.S 489 



6. Re-examination of the Spectra of 23 Gas- Vacuum, End-on Tubes, after 



six to ten years of Existence and Use. By 0. Piazzi Smyth 490 



7. On the Tones of Bells. By Lord Rayleigh, LL.D., Sec.R.S 491 



8. Seismological Work in Japan. By Professor .Tohn Milne, F.R.S 492 



9. On the Vibration of Railway Trains. By Professor John Milne, F.R.S. 492 



FRIDAY, SEPTEMBER 13. 



1. On the Quantity of Deposit of Silver produced by the development on a 

 Photographic Plate in terms of the intensity of Light acting. Bv Captain 

 Abney, C.B., R.E., F.R.S „ ., •;...... 493 



2. On Pin-hole Photography. By Loed Rayleigh, LL.D., Sec.R.S 493 



^' 0" Boscovich's Theory. By Sir William Thomson, D.C.L., LL.D., 



^•^•^ 494 



4. On the Determination of ' v ' by means of Electric Oscillations. Bv 0. J. 



Lodge, F.R.S., and R. T. Glazebrook, F.R.S 497 



5. On the Instruments used in the recent Magnetic Survey of France. Bv 

 Professor A. W. Rucker, M.A., F.R.S 497 



6. Report of the Committee on the Molecular Phenomena connected with 



the Magnetisation of Iron 407 



7. On Magnetic Viscosity in Iron. By Professor J. A. Ewinq, F.R.S 497 



