CONTENTS OF VOL. XXXVII. 



(SIXTH SERIES). 



NUMBEE CCXVIL— JANUARY 1919. 



Page 



Dr. Harold Jeffreys on Travelling Atmospheric Disturb- 

 ances 1 



Mr.T. K. Chinmayam on the Flow of Energy in the Electro- 

 magnetic Field surrounding a Perfectly Reflecting Cylinder. 

 (Plate I.) 9 



Dr. Paul D. Foote and Dr. Fred. E. Mohler on Ionization and 

 Resonance Potentials for Electrons in Vapours of Magne- 

 sium and Thallium 33 



Mr. Sisir Kumar Mitra on Sommerfeld's Treatment of the 

 Problem of Diffraction by a Semi-infinite Screen. (Plate 

 II.) 50 



Mr. C. D. Child on the Light from Mercury Vapour 61 



Mr. James Kam on Molecular Attraction and Attraction of 

 Mass, and some New Gas Equations 65 



Lord Eayleigh on the Optical Character of some Brilliant 

 Animal Colours , 98 



