VI CONTENTS OF VOL. XXII. SIXTH SERIES. 



Page 



Prof. R. B. Bolt wood and Prof. E. Rutherford on the Pro- 

 duction of Helium by Radium 086 



Dr. H. Geiger and Dr. A. E. Kovarik on the Relative Number 

 of Ions produced by the /3 Particles from the Various 

 Radioactive Substances 604 



Dr. H. Geiger and Mr. J. M. Nuttall on the Ranges of the 

 a Particles from Various Radioactive Substances and a 

 Relation between Range and Period of Transformation . . 013 



Prof. E. Rutherford and Dr. H. Geiger: Transformation 

 and Nomenclature of the Radioactive Emanations 621 



Mr. PI. G. J. Moseley and Dr. K. Eajans : Radio-active 

 Products of Short Life ' 629 



Prof. J. C. McLennan and Mr. E.N. Macallum on the Intensity 

 of the Earth's Penetrating Radiation at Different Altitudes 

 and a Secondary Radiation excited by it 639 



Mr. J. L. Glasson on the Variation of Ionizing Power with 

 the Velocity of Cathode Rays 6-17 



Prof. J. S. Townsend and Sir Oliver Lodge on the Mode of 

 Conduction in Gases ; tio6 



Mr. J. R. Airey : Tables of Neumann Functions G n (V) and 



**(*) ••••; ; 658 



Prof. W. Peddie on the Problem of Partition of Energy, 

 especially in Radiation 663 



Mr. L. R. Manlove : Supplemental Note on a Proposed 

 Method for the better practical application of Fourier's 

 Theorem 668 



NUMBER CXXXL— NOVEMBER. 



Prof. 0. W. Richardson on the Positive Ionization from Hot- 

 Salts 669 



Prof. 0. W. Richardson and Mr. R. C. Ditto on the Diffusion 

 of Neon through Hot Quartz 704 



Prof. E. Taylor Jones and Mr. D. E. Roberts on the Induction- 

 Coil. (Plates XII. & XIII.) 706 



Mr. IT. Donaldson on the Spectra of the Electrodeless Ring 

 Discharge in certain Gases 720 



Mr. G. Stead on the Separation of Spectra in Compound 

 Gases 727 



Lord Rayleigh on the General Problem of Photographic Re- 

 production, with suggestions for enhancing Gradation 

 originally invisible . . 734 



Dr.R. A.Houstoun on a Relation between Tension and Torsion. 740 



Dr. Plenry Wilde on the Origin of Cometary Bodies and 

 Saturn's Rings. (Plates XIV. & XV.) 741 



Mr. H. D. Arnold : Limitations imposed by Slip and Inertia 

 Terms upon Stokes's Law for the Motion of Spheres 

 through Liquids , 755 



