VII. The Electrical Conductivity and other Properties of Sodium Hydroxide in 



Aqueous Solution as Elucidating the Mechanism of Conduction. By WILLIAM 

 ROBERT BOUSFIELD, M.A., K.C., M.P., and THOMAS MARTIN LOWRY, D.Sc., 

 Lecturer in Physical Chemistry and Crystallography at the Central Technical 

 College, South Kensington. Communicated by Professor HENRY E. ARMSTRONG, 

 F.R.S. page 253 



VIII. On the Refractive Indices of the Elements. By GU.VE CUTHBERTSON. Com- 

 municated by Professor F. T. TROUTON, F.R.S. 323 



IX. On the Compressibility of Gases between One Atmosphere and Half an 



Atmosphere of Pressure. By LORD RAYLEIGH, O.M., F.R.S. .... 351 



X. An Analysis of the Results from tlie Falmouth Magnetographs on " Quiet" Days 



during the Twelve Years 1891 to 1902. By CHARLES CHREE, Sc.D., LL.D., 

 F.R.S. (From the National Physical Laboratory) 373 



XI. On the Modulus of Torsional Rigidity of Quartz Fibres and its Temperature 



Coefficient. By FRANK HORTON, D.Sc., B.A., St. John's College, Cambridge, 

 Mackinnon Student of the Royal Society, Communicated by Professor 

 J. J. THOMSON, F.R.S. 407 



XII. Effects of Temperature and Pressure on the Thermal Conductivities of Solids. 



Part I. The Effect of Temperature on the TJiermal Conductivities of some 

 Electrical Insulators. By CHARLES H. LEES, D.Sc. Communicated by 

 ARTHUR SCHUSTER, F.R.S. 433 



XIII. Polarised Rontgen Radiation. By CHARLES G. BARKLA, D.Sc. (Liverpool), 

 M.Sc. (Viet.), B.A. (Cantab.), King's College, Cambridge; Oliver Lodge 

 Fellow, University of Liverpool. Communicated by Professor J. J. THOMSON, 

 F.R.S. .' 467 



XIV. On the Convergence of Infinite Series of Analytic Functions. By H. A. WEBB, 



B.A., Fellow of Trinity College, Cambridge. Communicated by Professor 

 A. R. FORSYTH, Sc.D., LL.D., F.R.S. 481 



Index to Volume 499 



