VI CONTENTS OF VOL. XLIII. SIXTH SERIES. 



NUMBER CCLVL— APRIL. 



j 



Mr. 0. G. Darwin on the Theory of Radiation . 641 



Mr. Shizuwo Sano : Thermodynamical Theory of Surface Tension. . 649 



Drs. Paul D. Foote, F. L. Mohler, and W. F. Meggers on a Sig- 

 nificant Exception to the Principle of Selection. (Plate XIII.) . . 659 



Prof. A. L. Narayan on a Modified Form of Double Slit Spectro- 

 photometer. (Plate XIV.) , . , 662 



Messrs. A. L. Narayan and G. Subrahmanyam on Surface Tension 

 of Soap Solutions for Different Concentrations. (Plate XV.) . . . . 663 



Prof. B. M. Sen on the Kinetic Theory of Solids (Metals) and the 

 Partition of Thermal Energy. — Part I , 672 



Prof. B. M. Sen on the Kinetic Theory of Solids (Metals) and the 

 Partition of Thermal Energy.— Part II 683 



Dr. J. S. G. Thomas on the Thermometric Anemometer 688 



Mr. Gerald A. Newgass on a Possible Physical Interpretation of 

 Lewis and Adams 1 Relationship between h, c, and e 698 



Dr. Balth. van der Pol on Oscillation Hysteresis in a Triode 

 Generator with Two Degrees of Freedom 700 



Prof. R. Whiddington on Polarization Phenomena in X-ray Bulbs . 720 



Sir J. J. Thomson : Application of the Electron Theory of Chemistry 

 to Solids 721 



Prof. R. W. Wood on Fluorescence and Photo-Chemistry, (Plate 

 XVI.) 757 



Mr. F. Ian G. Rawlins on a possible Relationship between the Focal 

 Length of Microscope Objectives and the Number of Fringes seen 

 in Convergent Polarized Light , 766 



Dr. J. W. Nicholson on Products of Legendre Functions 768 



NUMBER CCLVII.-MAY. 



Mr. R. H. Fowler on the Kinetic Theory of Gases. Sutherland's 

 Constant S and van der Waals' a and their relations to the 



intermolecular field 785 



Mr. C. G. Darwin on the Reflexion of X-Rays from Imperfect 



Crystals 800 



Mr. U. Doi on Scattering and Dispersion of Light 829 



Mr. G. A. Hemsalech and the Comte de Gramont : Observations and 

 Experiments on the Occurrence of Spark Lines (Enhanced Lines) 

 in the Arc. — Part II. Magnesium. Zinc, and Cadmium. (Plates 



XVII. -XXI.) 834 



Mr. H. Carrington on Young's Modulus and Poisson's Patio for 



Spruce. (Plate XXII.) 871 



Dr. Charles Davison on the Diurnal Periodicity of Earthquakes . . 878 



Dr. Albert 0. Crehore on Atoms and Molecules. — II 886 



The Research Staff of the General Electric Company Ltd., London, 



on the Disappearance of Gas in the Electric Discharge. — III. . . 914 

 Mr. A. G. Shenstone on an Attempt to detect Induced Radioactivity 



resulting from a-Ray Bombardment 938 



Mr. A. M. Mosharrafa on the Appearance ofUnsymmetric.il Com- 

 ponents in the Stark Effect 943 



Prof. G. D. Birkhoff on Circular Plates of Variable Thickness 953 



Dr. Gregory Breit on the Effective Capacity of Multilayer Coils 

 with Square and Circular Section 963 



