iv CONTENTS OF VOL. VIII.—SIXTH SERIES. 
NUMBER XLIV.—AUGUST. 
Page 
Dr. C. Chree on the Law of Action between Magnets 
and its bearing on the Determination of the Horizontal 
Component of the Earth’s Magnetie Force with Unifilar 
Magnetometers =. 2. Sa peeenete  Py ee am eh... alae 1138 
Messrs. L. Holborn and L. W. Austin on Cathede Disintegra- 
tion in the Discharge through Gases at Low Pressures .. 145 
Hon. R. J. Strutt on Conduction of Electricity through High 
Vacua, under the influence of Radioactive Substances .... 157 
Prof. 1. Traube on a Theory of Salgeions 22 ee 158 
Dr. P. E. Shaw and Mr. C. A. B. Garrett on Coherence and 
Reeoherence «2%. «2.0 2 wie stele en ere cc eae eee 165 
Prof. A. W. Porter on the Diffraction Images formed by a 
Plane Diffraction-Grating “7. 2eeeeer ee oe ee 174 
Dr. E. Philip Harrison on the Variation with Temperature 
of the Magnetic Permeability of Nickel and Iron........ 179 
Mr. George W. Walker on the Rate of Recombination of 
Tons in Gases -.. . similis. eb keene eens eee 206 
Mr. k. K. McClung: Reply to Mr. G. W. Walker’s Paper 
on the “ Rate of Recombination of Ions in Gases” ...... 211 
Dr. C. H. Lees on a Simple Graphical Method of treating 
the Impact of Smooth Elastic Spheres ..............-. 215 
Mr. C. E. 8. Phillips on a new Automatic Gas-Pump ...... 218 
Prof. J. A. Fleming on a Model illustrating the Propagation 
of a Periodic Electric Current in a Telephone Cable, and 
the. Simple Theory of its Operation. (Plate 1V.)........ 221 
Mr. Gwilym Owen on the Discharge of Electricity from a 
Nernst. Filament «-: . i. - 4:25) eee ee ek eee 230 
Mr. G. T. Beilby on the Hard and Soft States in Metals. 
(Plates. V.~LX.) 0:05 iy, se mieieee ene en Eee eee 258 
Mr. H. M. Macdonald on the Electrical Vibrations associated 
with thin terminated Conducting Rods ...............- 276 
Dr. W. Marshall Watts on the Atomic Weight of Radium, 
and on Relationships between the Atomic Weights of the 
Elements and their Spectray,eeatemesireeen s - o-'s ee 279 
Notices respecting New Books :— 
i. Rutherford’s Radio-agtivityy {70 Gi) ge.0..6" .:: sae 284 
The late Sir George Gabriel Stokes’s Mathematical and 
Physical Papers: ....-\..% cise 2Pi ~~ > <a 287 
G. C. Schmidt’s Die Kathodenstrahlen .............. 287 
O. Kibling’s Karl Heumanns Anleitung zum Experi- 
mentieren bei Vorlesungen tiber Anorganische Chemie. 288 
Proceedings of the Geological Society :— 
Mr. Clement Reid on the probable Occurrence of an 
Eocene Outlier off the Cornish Coast............0. 289 
Mr. A. J. Jukes-Browne onthe Valley of the Teign.... 289 
Mr. G. Barrow on the Moine Gneisses of the EHast- 
Central Highlands . ::. gee a 291 
