CONTENTS. 



PAGE 



On the Oscillations of Stiperposed Fluids. By H. J. Priestley. (Com- 

 municated by W. Welsh.) (One fig. in Text) . . . . 297 



Discontinuities in Light Emission. By Norman Campbell. (Three 



figs, in Text) . . . . . 310 



The emission of positive rays from heated phosfhoms compoimds. By 



Frank Horton. (Two figs, in Text) 329 



On the shape of beams of canal-rays. By J. A. Orange. (Communi- 

 cated by Professor Sir J. J. Thomson.) (Seven figs, in Text) . 334 



An Electric Detector for Electromagnetic Waves. By E. M. Welhsch. 

 (Communicated by Professor Sir J. J. Thomson.) (One fig. in 

 Text) 337 



Aldahra and neighbouring Islands. By J. C. F. Fryer. (Plate XII) . 340 



Notes on the larger Cetacea. By D. G. Lillie. (Communicated by 



A. E. Shipley) . 347 



Experimental investigation as to Dependence of the Weight of a Body on 

 its state of Electrification. By L. Southerns. (Communicated by 

 Professor Sir J. J. Thomson.) (Five figs, in Text) . . . . .352 



Note on an Attempt to Detect a Difference in the Magnetic Properties 

 of the two kinds of Ions of Oxygen. By Miss D. B. Pearson. (Com- 

 municated by Professor Sir J. J. Thomson) . . . . . 373 



On the theory of the motion of charged Ions through a Gas. By Professor 



Sir J. J. Thomson 375 



