VI CONTENTS OF VOL. XXV. SIXTH SERIES. 



Page 



Mr. A. O. Allen ou Measurements of Inductance 520 



Dr. W. F. G-. Swann on the Pulse Theory of X Eays, y Bays, 

 and Photoelectric Eays, and the Asymmetric Emission of 

 /3'Bays . . . 534 



Mr. John Wylie : Graphical Construction for Steering Course 

 of a Ship 558 



Prof. T. B. Lyle on an Exact Mechanical Analogy to the 

 Coupled Circuits used in Wireless Telegraphy, and on a 

 G-eometrical Method of Interpreting the Equations of 

 such Circuits 567 



Mr, Clive Cuthbertson on the Befraction and Dispersion of 

 Gaseous Compounds, and the Cause of the Divergence 

 from Additive Eelations 592 



Dr. H. Geiger and Mr. E. Marsden on the Laws of Deflexion 

 of a Particles through Large Angles 604 



Prof. H. L. Cooke and Prof. O. W. Eichardson ou the 

 Absorption of Heat produced by the Emission of Ious from 

 Hot Bodies * 624 



Prof. J. Joly aud Prof. E. Butherford on the Age of Pleo- 

 chroic Haloes. (Plate IX.) 644 



Prof. W. H. Bragg on the Production of Fluorescent Bontgen 

 Eadiation 657 



Proceedings of the Geological Society : — 



Mr. W. H. Monckton on the Hafslo Lake and the 

 Solvorn Valley (Norway ) 659 



Intelligence and Miscellaneous Articles : — 



On the Current Potential Curves of the Oscillating 

 Spark, by S. E. Milner 660 



NUMBEB CXLIX.— MAT. 



Prof. Lynde P. Wheeler on the Dispersion of Metals 661 



Dr. A. LI. Hughes on a Sensitive Photo-Electric Cell 679 



Dr. A. LI. Hughes on the Velocities with which Photo- 

 Electrons are emitted from Matter 683 



Mr. E. V. Southwell on the Collapse of Tubes by External 



Pressure . . . , 687 



Lord Eayleigh on Conformal Eepresentation from a Mech- 

 anical Point of View 693 



Prof. J. E. Ives on the Absorption of Short Electric Waves 



by Air and Water- Vapour , 702 



Mr. Alexander Fleck on the Existence of Uranium Y 710 



Mr. John A. Cranston on the Growth of Eadiothorium from 



Mesothorium 2 712 



Dr. E. A. Houstoun on the Eelative Visibility of the Different 

 Colours of the Spectrum. Beiug a Report of a Committee 

 on that subject appointed by the Physical Society of 

 Glasgow University 715 



