[ V 1 
LIST OF ILLUSTKATIONS. 
Plate 1.—^Sir F. W. Dyson, Prof. A. S. Eddington, and Mr. C. Davidson on a 
Determination of the Deflection of Light by the Sun’s Gravitational Field, from 
Observations made at the Total Eclipse of May 29, 1919. 
Plates 2-5. —W. M. Hicks ; A Critical Study of Spectral Series. Part V. —The 
Spectra of the Monatomic Gases. 
