IV CONTENTS OF VOL. XXVIII. SIXTH SERIES. 



Page 

 Proceedings of the Geological Society : — 



Lady McBobert on Acid and Intermediate Intrusions in 



the Neighbourhood of Melrose 155 



Prof. J. W. Judd on the geology of Eockall 156 



Dr. H. S. Washington on the Composition of Bockallite. 157 

 Prof. J. W. Gregory on the Evolution of the Essex 



River-System 158 



Mr. J. B. Scrivenor on the Topaz-bearing Eocks of 



Gunong Bakau (Federated Malay States) 160 



NUMBEE OLXIV.— AUGUST. 



Lord Eayleigh on the Equilibrium of Eevolving Liquid under 

 Capillary Force 161 



Dr. Charles Sheard on the Positive Ionization from Heated 

 Platinum 170 



Messrs. C. E. Magnusson and H. C. Stevens ort Visual Sen- 

 sations caused by a Magnetic Field. (Plates III. & IV.) . 188 



Dr. Albert C. Crehore on the, Theory of the String Galvano- 

 meter of Einthoven 207 



Prof. D. N. Mallik on the Dynamical Theory of Diffraction . 224 



Mr. P. .T. Edmunds on the Discharge of Electricity from 

 Points 234 



Dr. Frank Horton on the Action of a Wehnelt Cathode .... 244 



Dr. C. V. Burton on the Possible Dependence of Gravitational 

 Attraction on Chemical Composition, and the Fluctuations 

 of the Moon's Longitude which might result therefrom . . 252 



Mr. S. S. Eichardson on Polarizing Prisms for the Ultra- 

 violet 256 



Sir Ernest Eutherford and Dr. E. N. da C. Andrade on the 

 Spectrum of the Penetrating y Eays from Eadium B and 

 Eadium C. (Plate V.) 263 



Mr. W. F. Eawlinson on the X-ray Spectrum of Nickel .... 274 



Messrs. H. Eobinson and W. F. Eawlinson on the Magnetic 

 Spectrum of the /3 Bays excited in Metals by Soft X Bays 277 



Sir Ernest Eutherford and Messrs. H. Eobinson and W. F. 

 Eawlinson on the Spectrum of the /3 Eays excited by;iy Eays. 281 



Dr. Norman Campbell on the Ionization of Platinum by 

 Cathode Eays 286 



Dr. G. Bruhat on the Theories of the Eotational Optical 

 Activitv 302 



NUMBEE CLXV.— SEPTEMBEE/ 



Sir Ernest Eutherford on the Connexion between the /3 and 

 y Eay Spectra 305 



Sir Ernest Eutherford : Eadium Constants on the Inter- 

 national Standard 320 



Messrs. H. G. J. Moseley and H. Eobinson on the Number 

 of Ions produced by the (3 and y Eadiations from Eadium. 327 



