VII. On the Fundamental Formulations of Electrodynamics. By G. H. LIVENS, 



University of Manchester. Communicated by W. M. HICKS, F.R.S. page 207 



VIII. The Influence of Molecular Constitution and Temperature on Magnetic 

 Susceptibility. Part IV. Further Applications of the Molecular Field. By 

 A. E. OXLEY, Major, R.A.F., M.A., D.Sc., Mackinnon Student of the Royal 

 Society. Communicated by Prof. J. W. NICHOLSON, F.R.S. . . . . 247 



IX. A Determination of the Deflection of Light fyy the Sun's Gravitational Field, 



from Observations made at the Total Eclipse of May 29, 1919. By Sir F. W. 

 DYSON, F.R.S., Astronomer Royal, Prof. A. S. EDDINGTON, F.R.S., and 

 Mr. C. DAVIDSON. (Communicated by the Joint Permanent Eclipse 

 Committee) 291 



X. A Critical Study of Spectral Series. Part V. -The Spectra of the Monatomic 



Gases. By W. M. HICKS, F.R.S. 335 



Index to Volume . 4G9 



