CONTENTS OF VOL. XLII.— -SIXTH SERIES. Vll 



Page 



Prof. A. S. Eddington on the Eelativity of Field and Matter. 800 



Mr. G. H. Livens : Does an Accelerated Electron necessarily 

 Eadiate Energy on the Classical Theory ? . 807 



Sir E. Eutherford and Dr. J. Ohadwick on the Artificial Dis- 

 integration of Light Elements 809 



Prof. C. V. Eaman and Mr. G. L. Datta on Quetelet's Eings 

 and other Allied Phenomena. (Plate XXV.) 826 



Prof. L. T. More on the Postulates and Conclusions of the 

 Theory of Eelativity 841 



Mr. E. W. B. Gill on Comparison of Processes of Ionization 

 which give rise to Currents in Gases 852 



Mr. G. P. Thomson on the Application of Anode Pays to the 

 Investigation of Isotopes. (Plate XXVI.) 857 



Prof. AV. T. David on Intra-Molecular Energy during 

 Combustion ['. 868 



Proceedings of the Geological Society 871 



Intelligence and Miscellaneous Articles : — 



The Mental Multiplication and Division of Large Num- 

 bers, by Clive Cuthbertson 872 



NUMBEE CCLIL— DECEMBER. 



Prof. J. S. Townsend and Mr. V. A. Bailey on the Motion of 

 Electrons in Gases 873 



Mr. A% L. McAulay on the Eecoil of Hydrogen Nuclei from 

 Swift ol Particles 892 



Mr. F. P. Slater on the Excitation of y Eadiation by a. Par- 

 ticles from Eadium Emanation 904 



Dr. J. Chad wick and Mr. E. S. Bieler on the Collisions of 

 ol Particles with Hydrogen Nuclei 923 



Dr. J. S. G. Thomas on the Mutual Action of the Convection 

 Currents arising from two fine heated Platinum Wires . . 940 



Mr. H. E. G. Beer and Prof. A. M. Tyndall on Manometric 

 Observations at the Poles of the Electric Arc 956 



Prof. A. M. Tyndall on the Forces acting upon the Poles of 

 the Electric Arc 979 



Sir J. J. Thomson on a Theory of the Striated Discharge. . . 981 



Drs. P. D. Eoote, W. F. Meggers, and F. L. Mohler on the 

 Excitation of the Enhanced Spectrum of Magnesium in a 

 Low Voltage Arc. (Plate XXVII.) 1002 



Profs. O. W. Eichardson and C. B. Bazzoni on the Excitation 

 of soft characteristic X-rays .1015 



Prof. C. Stormer : Eemarks concerning Professor Vegard's 

 Paper entitled " Eecent Eesults of Northlight Investi- 

 gations and the Nature of the Cosmic Electric Pays ". . . . 1019 



Prof. Akimasa Ono on the First Eoot of Bessel Functions of 

 Fractional Order , 1020 



Prof. A. Anderson on the Measurement of the Viscosity of 

 Gases , * I ( )oo 



Proceedings of the Geological Society 1024 



Index . . ■ 1025 



