viii CONTENTS OF VOL. XXV. -^SIXTH SERIES. 



PLATES. 



I. Illustrative of Mr. D. C. H. Florance's Paper on the Ioniza- 

 tion produced by /3 and y Rays at High Pressures. 

 II. Illustrative of Mr. J. H. T. Roberts's Paper on the Dis- 

 integration of Metals at High Temperatures. 



III. Illustrative of Prof. R. W. Wood's Papers on the Selective 



Dispersion of Mercury "Vapour at the 2536 Absorption 

 Line, and Resonance Experiments with the Longest Heat- 

 Waves. 



IV. Illustrative of Prof. R. W. Wood's Paper on the Satellites 



of the Mercury Lines. 

 V. Illustrative of Mr. Harold Smith's Paper on a Spectroscopic 

 Study of the Electric Brush Discharge in Water and Salt 

 Solutions. 

 VI. & VII. Illustrative of Prof. W. A. Douglas Rudge's Paper on the 

 Electrification associated with Dust-Clouds. 

 VIII. Illustrative of Mr. Allan Ferguson's Paper on the Theoretical 

 Shape of Large Bubbles and Drops, with other Allied 

 Problems. 

 IX. Illustrative of Profs. J. Joly and E. Rutherford's Paper on 



the Age of Pleochroic Haloes. 

 X. Illustrative of Prof. E. Percival Lewis's Paper on the Origin 

 of the Bands in the Spectrum of Active Mtrogen. 



