Xll CONTENTS. 



Page 



4. On (lie Convergence of certain Series used in Electron Theory. By 



Professor A. W. Conway 529 



5. Two Notes on Theory of Numbers. By Lieut. -Colonel Allan 



Cunningham, R.E 529 



6. The Initial Motions of Electrified Spheres. By J. W. Nichol- 



son, M.A., D.Sc 530 



7. On the Need of a Non-Euclidean Bibliography. By Duncan M. Y. 



Sommerville, M.A., D.Sc 531 



8. Report on the History and Present State of the Theory of Integral 



Equations. By H. Bateman (p. 345) 532 



9. The Foci of a Circle in Space and some Geometrical Theorems 



connected therewith. By H. Bateman 532 



10. On the Theory of the Ideals. By Professor J. C. Field 533 



11. Report on Bessel Functions (p. 37) 533 



MONDAY, SEPTEMBER 5. 



1. Demonstration of Vacuum-tight Seals between Iron and Glass. 



By Henry J. S. Sand, Ph.D., D.Sc 533 



2. *The Relation between Density and Refractive Index. By Dr. T. 



H. Havelock 534 



3. A Complete Apparatus for the Measurement of Sound. By Pro- 



fessor Arthur Gordon Webster 534 



4. On the Relation of Spectra to the Periodic Series of the Elements. 



By Professor W. M. Hicks, D.Sc, F.R.S 534 



5. The Series Spectrum of the Mercury Arc. By S. R. Milner, D.Sc. 534 



6. On Apparatus for the production of Circularly Polarised Light and 



a New Form of White Light Half-shade. By A. F. Oxley 535 



^Joint Discussion with Section G on the Principles of Mechanical 

 Flight. Opened by Professor G. H. Bryan, F.R.S 536 



TUESDAY, SEPTEMBER 6. 



Discussion on Atmospheric Electricity. Opened by Dr. ('hakles 



Chree, F.R.S 536 



Department of Mathematics and Physics. 



1. An Auto-collimating and Focussing Prism, and a Simple Form of 



Spectrograph. By Professor C. Fery, D.Sc 537 



2. The Magnetic Field produced by the Motion of a Charged Con- 



denser through Space. By W. F. G. Swann, B.Sc 538 



3. On the Secondary Radiation from Carbon at Low Temperatures. 



By V. E. Pound 538 



4. Photoelectric Fatigue. By H. Stanley Allen, M.A., D.Sc 538 



5 On the Recoil of Radium B from Radium A. By Dr. W. Makoweh, 



Dr. S. Russ, and E. J. Evans 541 



