IV CONTENTS OF VOL. XXXI. SIXTH SERIES. 



Page 

 Prof. A. LI. Hughes on the Velocities of the Electrons emitted 



in the Normal and Selective Photo-Electric Effects 100 



Prof. I. J. Schwatt on the Partial Fraction Problem 108 



Prof. G. IN". Watson on the Sum of a Series of Cosecants . . Ill 

 Pte. J. Alfred Hughes on the Cooling of Cylinders in a 



Stream of Air ^ 118 



Prof. W. B. Morton and Miss Eleanor J. Harvey : An Appli- 

 cation of Nomography to a case of Discontinuous Motion 



of a Liquid 130 



Mr. C. D. Child on the Production of Light by the Eecom- 



bination of Ions 139 



Prof. A. Anderson and Mr. J. E. Bo wen on a Method of 



measuring Surface-Tension and Angles of Contact 143 



Prof. O. W. Eichardson on the Complete Photoelectric 



Emission 149 



Dr. William Wilson on the Quantum of Action 156 



Mr. E. Gr. Bilham on a Comparison of the Arc and Spark 



Spectra of .Nickel produced under Pressure 163 



Prof. W. M. Hicks on a Notation for Zeeman Patterns .... 171 

 Intelligence and Miscellaneous Articles : — 



Henry Gwyn Jeffreys Moseley 173 



NUMBER CLXXXIIL— MAECH. 



Lord Eayleigh on the Electrical Capacity of Approximate 

 Spheres and Cylinders 177 



Prof. E. M. AVellisch on Eree Electrons in Gases 186 



Dr. J. G. Leathern on Two-Dimensional Eields of Plow, with 

 Logarithmic Singularities and Eree Boundaries 190 



Dr. Horace H. Lester : The Determination of the Work 

 Function when an Electron escapes from the Surface of a 

 Hot Body 197 



Prof. C. G. Barkla and Miss Janette G. Dunlop on the 

 Scattering of X-rays and Atomic Structure 222 



Mr. S. S. Eichardson ; Magnetic Eotary Dispersion in 

 Eelation to the Electron Theory. — Part I. The Deter- 

 mination of Dispersional Periods 232 



NUMBEE CLXXXIV.— APEIL. 



Prof. C. G. Barkla on Experiments to detect Eefraction of 

 X-rays 257 



Dr. S. A. Shorter on the Constitution of the Surface Layers 

 of Liquids.— Part I. . . . , 260 



