CONTENTS OF VOL. XXXVI. 



(SIXTH SEEIES). 



NUMBER CCXL— JULY 1918. 



Page 

 Prof. J. Joly on Scientific Signalling and Safety at Sea. 



(Plate I.) 1 



Prof. Barton and Miss Browning on Variably-Coupled Vi- 

 brations : III. Both Masses and Periods Unequal. (Plates 

 II.-V.) . . . . 36 



Dr. G. Green on Ship-Waves, and on Waves in Deep Water 

 due to the Motion of Submerged Bodies 48 



Dr. J. T. Tate and Dr. P. D. Foote on Eesonance and 

 Ionization Potentials for Electrons in Metallic Vapours . . 64 



Mr. Megh Nad Shaba on the Dynamics of the Electron .... 76 



Dr. B. van der Pol, Jr., on the Value of the Conductivity 

 of Sea- water for Currents of Frequencies as used in Wireless 

 Telegraphy 88 



Dr. L. Silberstein on General Eelativity without the Equi- 

 valence Hypothesis 94 



Mr. H. A. Webb and Dr. J. E. Airey on the Practical Im- 

 portance of the Confluent Hypergeometric Function. 

 (Plate VI.) 129 



