VI CONTENTS OF VOL. XVII. SIXTH SERIES. 



NUMBEE CI.— MAY. 



Page 

 Mr. W. Sutherland on the Electric Origin of Molecular 



Attraction 657 



Prof. J. A. Fleming and Mr. G. B. Dyke on the Production 

 of Steady Electric Oscillations in Closed Circuits and a 



Method of Testing Eadiotelegraphic Eeceivers 670 



Prof. J. A. Fleming and Mr. H. W. Eichardson on the Effect 

 of an Air-Blast upon the Spark Discharge of a Condenser 



charged by an Induction Coil or Transformer 677 



Dr. C. V. Burton on the Kinetic Criterion of Potential Energy. 692 

 Mr. E. J. A. Barnard : Direct Application of the Electron 



Theory to Induction Currents 706 



Mr. E. B. Pidduck on the Absorption of Ultra- Violet Light 



by Dilute Solutions . , 710 



Mr. A. Holt, Junr., on the Dissociation of Water Vapour . . 715 

 Prof. E. Eutherford on Condensation of the Eadium Ema- 

 nation 723 



Dr. S. P. Thompson and Mr. E. W. Moss on the Self- 

 Demagnetizing Factor of Bar Magnets. (Plate XV.) .... 729 

 Dr. C. G-. Barkla and Mr. C. A. Sadler on the Absorption of 



Eontgen Eays 739 



Prof. J. Joly on the Distribution of Thorium in the Earth's 



Surface Materials 760 



Mr. A. Stephenson on Induced Stability 765 



Mr. S. Gr. Starling on the Treatment of Electrodynamics . . 767 

 Notices respecting New Books : — 



Dr. G. Senter's Outlines of Physical Chemistry 768 



Department of Commerce and Labor, Coast and Geodetic 

 Survey ; United States Magnetic Tables and Magnetic 



Charts for 1905, by L. A. Bauer 769 



Proceedings of the Geological Society : — 



Prof. J. H. L. Vogt on Labradorite-Norite with Por- 



phyritic Labradorite 769 



Miss G. L. Elles on the Conway Succession 771 



Mr. A. J. Jukes-Browne on the Depth and Succession 

 of the Bovey Deposits 772 



NUMBEE CIL— JUNE. 



Prof. J. H. Jeans on the Motion of Electrons in Solids. 

 Part I. — Electric Conductivity, Kirchhoft's Law and 

 Eadiation of Great Wave-length 773 



Dr. G. Eudorf on the Molecular and some other Constants 

 of the Inactive Gases. — Part I. 795 



Prof. O, W. Eichardson on Thermionics 813 



