CONTENTS OF VOL. XVII. SIXTH SERIES. Vll 



Page 

 Dr. S. W. J. Smith on the Action between Metals and Acids 

 and the Conditions under which Mercury causes Evolution 



of Hydrogen 833 



Mr. E. C. Snow on Pirani's Method of Measuring the Self- 

 Inductance of a Coil 849 



M. A. Dufour on the Secondary Spectrum of Hydrogen . . 854 

 Prof. W. H. Bragg and Mr. J. L. Glasson on a Want of 



Symmetry shown by Secondary X-Rays 855 



Notices respecting New Books : — 



Dr. Ph. Kohnstamm's Lehrbuch der Therm odynamik . . 864 



Dr. W. Voigt's Magneto- unci Electrooptik 865 



The Norwegian Aurora Polaris Expedition 1902-1903 : 

 Vol. I. On the Cause of Magnetic Storms and the 

 Origin of Terrestrial Magnetism, by Kr. Birkeland . . 866 



Index 868 



