﻿CONTENTS OF VOL. XXIII. SIXTH SERIES. V 



Page 

 Mr. Allan Ferguson on Photographic Measurements of 



Pendent Drops. (Plate VIII.) 417 



Lord Bavleigh on Departures from Eresnel's Laws of Reflexion 431 

 Dr. H. G-eiger and Mr. J. M. Nuttall on the Ranges of the 



a Particles from Uranium . - 439 



Notices respecting New Books : — 



C V. Durell's A Course of Plane Geometry for Advanced 



. Students 445 



Dr. W. P. Milne's Homogeneous Coordinates for use in 



Colleges and Schools 446 



Prof. J. A. Fleming's The Propagation of Electric 



Currents in Telephone and Telegraph Conductors . . 446 

 Bulletin of the Bureau of Standards 447 



NUMBER CXXXVL— APRIL. 



Sir J. J. Thomson on Ionization by Moving Electrified 



Particles 449 



Prof.. A. W. Porter on the Viscosity of Liquids . „ 458 



Dr. Norman Campbell on Ionization by Alpha Rays 462 



Mr. S. A. Shorter on the Application of the Theory of 

 Chemical Potential to the Thermodynamical Theory of 

 Solutions. — Part II. The Effect of Pressure on Vapour- 

 Pressure, etc 483 



Prof. Edward V. Huntington : A New Approach to the 



Theory of Relativity 494 



Mr. S. B. McLaren on the Emission and Absorption of 



Radiation in any Material System and Complete Radiation 513 

 Dr. J. Robinson on the Photoelectric Properties of Thin 



Metal Films 542 



Dr. S. R. Milner on the Virial of a Mixture of Ions 551 



Mr. Karl T. Compton on the Influence of the Contact Dif- 

 ference of Potential between the Plates emitting and re- 

 ceiving Electrons liberated bv Ultra-violet Light on the 

 Measurement of the Velocities of these Electrons. 



(Plate IX.) 579 



Prof. 0. W. Richardson on some Applications of the Electron 



Theory of Matter 594 



Dr. Georg von Hevesy on the Electrochemistry of Radio- 

 active Bodies ' 628 



Mr. N^vil Maskelyne on the Trisection of an Angle 646 



Prof. W. H. Bragg on the Direct or Indirect Nature of the 



Ionization by X-rays 647 



Mr. E. Buckingham on the Time-Scale 651 



Mr. N. Eumorfopoulos on the Expansion of Mercury and of 



Quartz 653 



Mr. R. D. Kleeman on the Law of Molecular Attraction . . 656 

 Mr. H. Davies on a Relation between Coefficients of Ex- 

 pansion of Liquids and their Critical Temperatures .... 657 



