viii Gontents. 



■ ■ PAGE 



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

 (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 inv.estigation 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 Test) . . , . . 352 



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

 of the two hinds 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 



On the relative velocities of diffusion in aqueous solution of rubidium and 



caesium chlorides. By G. R. Mines. (Two figs, in Text) . .381 

 Note on the iise of the experimental method described in the preceding 



paper. By A. V. Hill. (One fig. in Text) 387 



A note on some fossil plants from Newfoundland. By E. A. Newell 



Arber. (Two figs, in Text) 390 



A note on Gardiocarpon compressum, Will. B}^ Mrs E. A. Newell i 



Arber. (Communicated by E. A. Newell Arber) . . . 393' 

 On a oiew species of Physostoma from the Lower Carboniferous Rocks of 



Pettycur (Fife). By W. T. Gordon. (Communicated by E. A. 



Newell Arber) 395 



On the relation betioeen the fossil Osmundaceae and the Zygopterideae. 



By W. T. Gordon. (Communicated by E. A. Newell Arber) . 398 

 On the occurrence of Schizoneura paradoxa, Schimper and Mougeot, in 



the Biinter of Nottingham. By R. D. Vernon. (Communicated 



by E. A. Newell Arber) 401 



Notes on the genus Schizoneura, Schimper and Mougeot. By L. J. 



Wills. (Communicated by E. A. Newell Arber) . . . 406 

 On Petnfied Plant Remains from the Upper Coal Measures of Bristol. 



By D. G. Lillie. (Communicated by E. A. Newell Arber) . 411 



On the assimilating tissues of some Coal Measure Plants. By H. 



Hamshaw Thomas 413 



The production of Cathode Particles by Homogeneous Rontgen Radia- 

 tions. By R. T. Beatty. (Communicated by Professor Sir J. J. 



Thomson.) (Three figs, in Text) . .416 



The solution of a system of differential equations occurring in the theory 

 ■ of radio-active tra)isformatio7is. By H. Bateman. (One fig. in Text) 423 



