CONTENTS Of VOL. XXXVII. SIXTH SERIES. Vll 



NUMBER CCXXIL— JUNE. 



Page 



Prof. Sir E. Rutherford on Collision of a Particles with 

 Light Atoms. I. Hydrogen 537 



Prof. Sir E. Rutherford on Collision of a Particles with 

 Light Atoms. II. Velocity of the Hydrogen Atom .... 562 



Prof. Sir E. Rutherford on Collision of a Particles with 

 Light Atoms. III. Nitrogen and Oxygen Atoms 571 



Prof. Sir E. Rutherford on Collision of a Particles with 

 Light Atoms. IV. An Anomalous Effect in Nitrogen . . 581 



Mr. D. Coster on the Rotational Oscillation of a Cylinder in 

 a Viscous Liquid 587 



Mr. J. M. Burgers on a proposed Hydraulic Experiment . . 595 



Dr. H. T. H. Piaggio on the Numerical Integration of Dif- 

 ferential Equations 596 



Dr. Manne Siegbahu on Precision-measurements in the 

 X-Ray Spectra 601 



Index 613 



