CONTENTS O* VOL. XXXIX 



(SIXTH SERIES). 



NUMBER CCXXIX.— JANUARY 1920. 



Page 



Capt. A. C. Egerton on the Determination of Chemical 



Constants 1 



Prof. F. A. Lindemann on the Significance of the Chemical 



Constant and its Relation to the Behaviour of Gases at 



Low Temperatures 21 



Prof. "W. C. McC. Lewis on an Unsolved Problem in the 



Application of the Quantum Theory to Chemical Reactions. 26 

 Mr. D. L. Hainmick on Latent Heat and Surface Energy. — 



Part II 32 



Dr. L. Silberstein : Contribution to the Quantum Theory of 



Spectrum Emission : Spectra of Atomic Systems containing 



a Complex Nucleus , 46 



Major W. T. David on the Calculation of Radiation emitted 



in GJ-aseous Explosions from the Pressure-Time Curves . . 66 

 Major W. T. David : An Analysis of the Radiation emitted 



in Gaseous Explosions 84 



Mr. Loyd A. Jones on a Method and Instrument for the 



Measurement of the Visibility of Objects 96 



Mr. Satyendra Ray on the Equivalent Shell of a Circular 



Current 134 



Prof. C. V. Raman and Mr. Ashutosh Dey on the Sounds of 



Splashes. (Plate I.) 145 



Prof. A. Anderson on Fresnel's Convection Coefficient .... 148 

 Mr. F. F. Renwick on the Fundamental Law for the true 



Photographic Rendering of Contrasts 151 



Prof. I. W. D. Hackh : A Table of the Radioactive Elements 



which indicates their Structure 155 



Prof. W. B. Morton and Mr. T. C. Tobin on the Construction 



of a Parabolic Trajectory and a Property of the Parabola 

 used by Archimedes 157 



