PLATES. 



I. & II. Illustrative of Mr. W. N. Bond's Paper on the Properties of 

 Plastic Crystals of Ammonium Nitrate. 

 III. Illustrative of Mr. L. Siinons's Paper on the Beta-Ray Emission 

 from Thin Films of the Elements exposed to Rontgen Rays. 

 IV. & V, Illustrative of Profs. 0. V. Raman and Bhabonath Banerji's 

 Paper on the Colours of Mixed Plates, 

 VI. Illustrative of Prof. H. Nagaoka's Paper on the Magnetic Field 

 of Circular Currents* 

 VII. Illustrative of Mr. R. V. Southwell's Paper on a Graphical 

 Method for determining the Frequencies of Lateral Vibration, 

 or Whirling Speeds, for a Rod of Non-Uniform Cross-Section. 

 VIII. Illustrative of Mr. G. Stead's Paper on the Design of Soft 

 Thermionic Valves. 

 IX. Illustrative of Mr. H. Carrington's Paper on the Moduli of 

 Rigidity for Spruce. 



