CONTENTS. 



PAGE 



On the variation with the wave-length of the double refraction in strained 



glass. (Third paper.) By L. N. G. Filon . . . . .. 313 



Note on the measurement of the dispersion of double refraction in strained 



glass. By L. N. G. Filon . . . . . . ' . .337 



On Differences between the Spectra at Anode and Kathode in certain gases, 

 and on the probable reasons for these differences (with Plate IV). By 

 Prof. G. D. Liveing . . . . . . . . . . 338 



On the Distribution and Spectra of Metallic Vapours in Electric Sparks. 



By Hugh Ramage ... . . 350 



On the transmission of Earthquake wa/oes through the Earth. By Rev. 



0. Fisher 354 



Some High Andine and Antarctic Umteiliferae. By A. W. Hill . . 362 



Free-living fresh-water New Zealand Nematodes. By N. A. Cobb, with 



note by K. Lucas. (Communicated by A. E. Shipley) . . . 363 



Relative Amount of Ionization produced in Air and Hydrogen by Rontgen 



Rays. By R. K. McClung . . ... . . . 375 



On the Calculation of Capacities in terms of the Coefficients of Electrostatic 



Induction. By G. F. C. Searle . , . . . . .^378 



On a soluble colloidal form of ferric and of other phosphates. By 



W. J. Sell . . . .... . . . .388 



On the pi'esence of Radio- Active Matter in ordinary substances. By Prof. 



J. J. Thomson .... ....... 391 



The Temperature Effect in the Combination of Hydrogen and Chlorine 



under the influence of Light. By P. V. Bevan .... 398 



On Convection of Heat. By Harold A. Wilson 406 



The decomposition of Hydrogen Dioxide under the infltmice of Radium 



Bromide. By H. J. H. Fenton . . . . . . , 424 



Exhibition of Oribatid Mites taken in the neighbourhood of CamhHdge. 



By C. Warburton and N. D. F. Pearce . . . . . 427 



Some observations upon the Determination of Sex in Plants. By R. P. 



Gregory. (Communicated by W. Bateson) . . . . . 430 



On Variation in the Number and Arrangement of the Male Genital 

 Apertures and on the Proportion of the Sexes in the Norway Lobster 

 (Nephrops norvegicus). By D. C. McIntosh. (Communicated by 

 Francis H. A. Marshall) ........ 441 



The Boiling Points of Homologous Compounds. By Hugh Ramage . 445 



