VI CONTENTS OF VOL. X. SIXTH SERIES. 



NUMBEE LVIIL— OCTOBEB. 



Page 



Lord Bayleigh ou the Origin of the Prismatic Colours 401 



Prof. E. W. Wood on the Magneto-Optics of Sodium Vapour 



and the Botatory Dispersion Formula. (Plate V.) 408 



Prof. E. W. Wood on the Scintillations produced by Radium. 



(Plate VI.) 427 



Dr. J. A. Harker on the Specific Heat of Iron at High Tem- 

 peratures 430 



Mr. A. E. Harward on the Transfinite Numbers 439 



Miss J. M. W. Slater on the Emission of Negative Electricity 



by Eadium and Thorium Emanations 460 



Eev. P. J. Kirkby on the Union of Hydrogen with Oxygen 



at Low Pressures caused by the Heating of Platinum .... 467 

 Dr. Harold A. Wilson on the Electrical Conductivity of 



Elames 476 



Mr. Eollo Appleyard on Contact with Dielectrics 485 



Lord Blythswood and Mr. H. S. Allen on Devvar's Method 



of producing High Vacua 497 



NUMBER LIX.— NOVEMBEE. 



Prof. E. W. Wood on the Fluorescence of Sodium Vapour 

 and the Eesonance Eadiation of Electrons. (Plate VII.). . 513 



Mr. Walter Makower on the Method of Transmission of the 

 Excited Activity of Eadium to the Cathode 526 



Mr. W. H. Jackson on a Paper by W. Makower entitled 

 u On the Method of Transmission of the Excited Activity 

 of Eadium to the Cathode " 532 



Prof. A. Stanley Mackenzie on the Deflexion of a Eays from 

 Eadium and Polonium. (Plate VIII.) 538 



Messrs. K. Honda and S. Shimizu on the Magnetization and 

 the Magnetic Change of Length in Ferromagnetic Metals 

 and Alloys at Temperatures ranging from — 186° C. to 

 + 1200° C. (Plates IX.-XIL) 548 



Dr. J. Larmor on the Constitution of Natural Eadiation .... 574 



Prof. J. J. Thomson on the Emission of Negative Corpuscles 

 by the Alkali Metals 584 



Prof. D. B. Brace : A Eepetition of Fizeau's Experiment on 

 the Change produced by the Earth's Motion on the Rotation 

 of a Eefracted Bay 591 



Prof. W. H. Bragg on the a Particles of Eadium 000 



Dr. T. H. Havelock on Surfaces of Discontinuity in a Rota- 

 tionally Elastic Medium * , . . . 603 



