IV CONTENTS OF VOL. XLI. SIXTH SERIES. 



Page 



Dr. J. 11. Airey on Bessel Functions of small Fractional Order 

 and their application to problems of Elastic Stability .... 200 



Mr. H. Carrington on the Determination of Values of Young's 

 Modulus and Poisson's Ratio by the Method of Flexures. 206 



Prof. Nihal Karau Sethi on Talbot's Bands and the Colour- 

 Sequence in the Spectrum 211 



Prof. W. B. Morton and Mr. T. C. Tobin on Times of Descent 

 under Gravity, suggested by a Proposition of Galileo's . . 225 



Dr. J. S. G. Thomas on the Thermal Effect produced by a 

 slow Current of Air flowing past a Series of fine heated 

 Platinum Wires, and its Application to the Construction of 

 Hot-Wire Anemometers of great Sensitivity, especially ap- 

 plicable to the Investigation of Slow Rates of Flow of Gases. 240 



Miss L. M. Swain on the Period of Vibration of the Gravest 

 Mode of a Thin Bod, in the form of a Truncated Wedge, 

 when in Rotation about its Base 259 



Dr. Megh Nad Saha on the Problems of Temperature Ra- 

 diation of Gases. (Paper C.) 267 



Prof. A. H. Compton on Possible Magnetic Polarity of Free 

 Electrons 279 



Prof. Or me Masson ou the Constitution of Atoms ........ 281 



Dr. W. J. Walker on Fluid Discharges as affected by Resist- 

 ance to Flow 286 



Prof. J. Joly on a Quantum Theory of Vision 289 



Prof. D. N. Mallik on the Electric Discharge in Hydrogen. . 304 



Sir E. Rutherford on the Collision of « particles with 

 Hydrogen Atoms 307 



NUMBER CCXLIIL— MARCH. 



Prof. W. L. Bragg, Mr. R. W. James, and Mr. C. H. Bosanquet 

 on the Intensity of Reflexion of X-Rays by Rock-Salt. . . . 309 



Prof. C. V. Raman and Prof. Bbabonath Banerji on the 

 Colours of Mixed Pla'es.— -Part I. (Plates IV. & \.) 338 



Mr. J. H. J. Poole on the Photo-Electric Theory of Vision. . 347 



Mr. G. H. Briggs on the Distribution of the Active Deposits 

 of Radium, Thorium, aud Actinium in Electric Fields .... 357 



Prof. H. Nagaoka on the Magnetic Field of Circular Currents. 

 (Plate VI.) 377 



Mr. II. T. Flint on Integration Theorems of Four-Dimen- 

 sional Vector Analysis 389 



Prof. S. R. Milner : Does an Acelerated Electron necessarily 

 Radiate Energy on the Classical Theory ? 405 



Mr. R. V. Southwell on a Graphical Method for determining 

 the Frequencies of Lateral Vibration, or "Whirling Speeds, 

 for a Rod of Non-Uniform Cross-Section. (Plate VII.) . . 419 



