CONTENTS OF VOL. XXII 



(SIXTH SERIES). 



NUMBER CXXVIL— JULY 1911. 



Page 

 Sir Oliver Lodge on the Mode of Conduction in Gases 



illustrated by the Behaviour of Electric Vacuum Valves . . 1 

 Dr. A. S. Eve on the Coefficient of Absorption by Air of the 



Beta Bays from Badium C 8 



Mr. W. Sutherland on Weak Electrolytes and towards a 



Dynamical Theory of Solutions 17 



Mr. S. B. McLaren on the Emission and Absorption o£ 



Energy by Electrons 66 



Dr. J. E. Mills on the Relation of Temperature and Molecular 



Attraction . , 84 



Mr. G. H. Berry on Pianoforte Bridges. (Plate I.) 113 



Prof. C. Bams on Elliptic and other Interference with 



Reflecting Gratings 118 



Lord Rayleigh on Aberration in a Dispersive Medium 130 



Prof. J. Joly on a Method of Investigating the Quantity of 



Radium in Rocks and Minerals, &c 134 



Dr. W. F. G. Swann on the Magnetic Eield produced by a 



Charged Condenser moving through Space 150 



Mr. G. II. Livens on the Initial Accelerated Motion of a 



Rigidly Charged Dielectric Sphere 169 



Mr. L. R. Manlove : Proposed Method for the better practical 



Application of Fourier's Theorem concerning the Roots of 



an Algebraical Equation 173 



Prof. D. N. Mallik on Lines of Force due to given Static 



Charges. (Plate II.) 177 



Mr. R. F. Gvvyther on the Stresses in a IleaAy Spherical 



Shell 191 



Dr. "W. C. M C C. Lewis on the Internal Pressure of a Liquid. 193 

 Mr. E. C. Snow : ISote on the Paper by Prof. Rutherford, 



E.R.S., andH. Geiger, Ph.D., on "The Probability Variations 



in Distribution of a Particles " 198 



Dr. H. Geiger on the Transformation of the Actinium 



Emanation 201 



Prof. J. S. Townsend on Charges on Ions in Gases 201 



The Earl of Berkeley and Dr. C. V. Burton on a Thermostat 



for Controlling the Temperature of a Room 211 



Dr. F. Horton on the Origin of Spectra 214 



