CONTENTS OF VOL. XXV. SIXTH SERIES. Vll 



Page 

 Prof. E. Butherford and Mr. H. Eichardson : The Analysis 



of the Gamma Eays from Eadium B and Eadium C .... 722 

 Dr. Gwilym Owen and Mr. Eobert Halsall on the Carriers 



of the Negative Thermionic Current in a Vacuum 735 



Mr. A. van den Broek on a Quantitative Eelation between 

 the Eange of the a Particles and the Number of Charges 



emitted during Disintegration 740 



Dr. S. E. Milner on the Effect of Interionic Forces on the 



Osmotic Pressure of Electrolytes 742 



Notices respecting New Books : — 



^mmi j^ Blein's Optique ge'ometrique 752 



A. S. Percival's Geometrical Optics 752 



Proceedings of the Geological Society : — 



Mr. J. Brooke Scrivenor on the Geological History of 



the Malay Peninsula 752 



Mr. C. T. Trechmann on a Mass of Anhydrite in the 



Magnesian Limestone at Hartlepool 754 



Dr. C. A. Matley on the Geology of Bardsey Island 



(Carnarvonshire) 755 



Mr. E. Battersby Bailey on the Loch Awe Syncline 

 (Argyllshire). 756 



NUMBEE CL.— JUNE. 



Sir Oliver Lodge on a Dynamo for maintaining Electrical 

 Vibrations of High Frequency. With some notes on the 

 Transmission of Waves in Wireless Telegraphy 757 



Mr. J. Crosby Chapman on some Experiments on Polarized 

 Ebntgen Eadiation 792 



Dr. Norman Campbell on Ionization by Charged Particles . . 803 



Mr. G. H. Livens on Eotational Optical Activity of 

 Solutions « « 817 



Prof. E. Percival Lewis on the Origin of the Bands in the 

 Spectrum of Active Nitrogen. (Plate X.) 826 



Prof. C. G. Barkla and Mr. A. J. Philpot : Ionization in 

 Gases and Gaseous Mixtures by Ebntgen and Corpuscular 

 (Electronic) Eadiations 832 



Prof. J. Joly on the Temperature of Sublimation 856 



Notices respecting New Books : — 



Prof. Jean Perrin's Les Atomes 869 



Intelligence and Miscellaneous Articles : — 



The Production of Fluorescent Ebntgen Eadiation, by 

 J. Crosby Chapman 870 



Index , 871 



