CONTENTS, 



PAGE 



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 use of the experimental method described in the preceding 



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



A note on some fossil plo.nts from Nevjfoundland. By E. A. Newell • 

 Arber. (Two figs, in Text) .390 



A note on Cardiocarpbn compressum, .Will. By Mrs E. A. Newell 



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



On a nev) 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 between the fossil Osmundaceae and the Zygopterideae. 



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



Oil the occurrence of Schizoneura paradoxa., Schimper and Mougeot, in 

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

 by E. A. Newell Arber) 401 



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



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



On Petrified Plant Remains from the Upper Goal Me_asv,res 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 RSntgen 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 transformations. By H. Bateman. (One fig. in Text) 423 



■On double-sixes. By W. Burnside 428 



On the Procession and Pupation of the Larva of Cnethocampa pinivora. 



By T. G. Edwards. (Communicated by H. H. Brindley) . . 431 



Secondary Rontgen Rays from Metallic Salts. By J. L. Glasson. (Com- 

 municated by Professor Sir J. J. Thomson.) (Five figs, in Text) . 4:37 



On the Trans-mission of ^-rays. By J. A. Crowther. (Six figs, in Text) 442 



Some Experiments on lonisation in Dried Air. By S. G. Lusby. (Com- 

 municated by Professor Sir J. J. Thomson) ..... 459 



On the Scattering of rapidly moving Electrified Particles. By Professor 



Sir J. J. Thomson 465 



Jacobins double-residue theorem in relation to the theory of point-groups. 



By A. C. Dixon .... .472 



On the phosphorescence observed on the glass of vacuum tubes when the 



p)-essure is not very low. By Professor Sir J. J. Thomson . . 482 



