IV CONTENTS OF VOL. XXXVII. SIXTH SERIES. 



Page 



Prof. S. Banerji on the Eadiation of Light from the 

 Boundaries of Diffracting Apertures. (Plates III. & IV.). 112 



Capt. E. V. Appleton on the Effects of Grid Currents in 

 Three-Electrode Ionic Tubes 129 



Mr. A. E. McLeod on the Lags of Thermometers with Sphe- 

 rical and Cylindrical Bulbs in a Medium whose Temperature 

 is changing at a Constant Rate 134 



Prof. Q. Majorana : Experimental Demonstration of the 

 Constancy of Velocity of the Light emitted by a Moving 

 Source 145 



Prof. E. Birkeland : An Attempt to explain the Michel- 

 son Interference-Experiment 150 



Dr. Gilbert T. Walker on Fer mat's Law 156 



Prof. D. N. Mallik on Fermat's Law 158 



Sir Joseph Larmor on the Principle of Molecular Scattering 

 of Eadiation 161 



Mr. G. H. Livens on the Energy in the Electromagnetic Field 164 



NUMBEE CCXVIIL— FEBEUAET. 



Dr. Tycho E:son Auren on the Absorption of X-Eays .... 165 

 Mr. Oskar Klein : Calculation of Scattered Eadiation from a 



Plate exposed to a Beam of X-Eays , 207 



Dr. E. A. Houstoun on Fizeau's Experiment and the iEther 214 



Dr. II. Bateman on General Eelativity 219 



Dr. George W. Todd and Mr. S. P. Owen on the Influence 



of Temperature on Homogeneous Gas Eeactions 224 



Dr. L. Silberstein on Boundary Difficulties of Einstein's 



Gravitation Theory 230 



