VI CONTENTS OF VOL. XXXIII. SIXTH SERIES. 



Page 

 Lord Rayleigh on the Theory of Anomalous Dispersion .... 496 

 Prof. P. Ehrenfest on Adiabatic Invariants and the Theory 



of Quanta 500 



Mr. J. M. Burgers on Adiabatic Invariants of Mechanical 



Systems 514 



Dr. L. Silberstein on Molecular Eefractivity and Atomic 



Interaction. — II 521 



Notices respecting New Books : — 



Science Progress. No. 43 533 



Proceedings of the Geological Society : — 



Mr. H. Orunden Sargent on a Spilitic Pacies of Lower 

 Carboniferous Lava-Plows in Derbyshire ......... 534 



Intelligence and Miscellaneous Articles : — 



Arnold Lockhart Pletcher 535 



On the " Wolf-Note " in Bowed Stringed Instruments, 

 by J. W. GHltay ...... 536 



Index 537 



