CONTENTS OF VOL. XXVIII. SIXTH SERIES. Vll 



Proceedings of the Geological Society : — 



Mr. C. T. Trecbmann on the Scandinavian Drift of the 



Durham Coast 758 



Mr. F. W. Penny on the Eelationship of the Vredefort 



Granite to the Witwatersrand System 759 



Mr. E. B. Bailey on the Ballachulish Fold near the Head 



of Loch Creran 760 



Intelligence and Miscellaneous Articles : — 



Correction in " Notes on the Motion of Viscous Liquids 



in Channels " by J. Proudman 760 



NUMBER CLXV1IL— DECEMBEK. 



Dr. A. N. Lucian on the Distribution of the Active Deposit 



of Actinium in an Electric Field 761 



Mr. J. C. Buckley on the Bitilar Property of Twisted Strips . 778 

 Mr. Ivar Maimer on the High-Frequency Spectra of the 



Elements. (Plate XIV.) 787 



Mr. S. Lees on the Analysis of Energy Distribution for 



Natural Radiation 794 



Mr. T. Carlton Sutton on the Mechanism of Molecular 



Action. (A Contribution to the Kinetic Theory of Gases.) 798 

 Mr. A. B. Wood on the Volatility of Thorium D. With 



a Note on the Relative /3 Activities of Thorium C and D. . 808 

 Mr. R. W. Varder and Dr. E. Marsden on the Transforma- 

 tions of Actinium C 818 



Mr. T. Harris on the Reflexion of Electromagnetic Waves 



from the Surface of a Moving Mirror 822 



Messrs. Arthur Holmes and Robert W. Lawson on Lead and 



the End Product of Thorium.— Part 1 823 



Proceedings of the Geological Society : — 



Mr. L. Richardson on the Inferior Oolite and Contiguous 

 Deposits of the Doulting-Milborne-Port District 



(Somerset) 841 



Intelligence and Miscellaneous Articles : — 



Method of comparing Self-Inductance and Capacity, 

 by A. Campbell 842 



Index 843 



