IV CONTENTS OF VOL. XLII. SIXTH SERIES. 



Page 

 Mr. E. W. James on the Crystalline Structure of Bismuth . . 193 

 Prof. A. McAulay on Integration Theorems of Four-Dimen- 

 sional Vector Analysis 197 



Proceedings of the Geological Society 197 



Intelligence and Miscellaneous Articles : — 



Some Problems relating to Rotating Fluid in the Atmo- 

 sphere, by G. Green 200 



NUMBER OOXL VIII.— AUGUST. 



Mr. E. V. Appleton and Dr. Balth. van der Pol, Junr., on the 

 Form of Free Triode Vibrations. (Plates VII1.-X.) 201 



Mr. F. B. Pidduck on a Method of Measuring the Self- 

 induclance of Small Loops 220 



The Research Staff of the General Electric Company, Ltd., 

 London, on the Disappearance of Gas in the Electric 

 Discharge.— III. 227 



Mr. H. P. Waran on a Convenient Apparatus for the Pre- 

 paration of Small Quantities of Pure Nitrogen or Carbon 

 Monoxide 246 



Mr. L. A. Pars on the Lorentz Transformation 249 



Dr. O. C. M. Davis and Dr. F. W. Rixon on the Chromo- 

 genetic Properties of Sulphur and certain other Elements. 259 



Mr. R. B. Wilsey on the Crystal Structure of the Silver 

 Halides 262 



Mr. D. Laugharne Thornton on the Einstein Spectral Line 

 Effect 264 



Prof. J. S. Townsend and Mr. J. H. Morrell on Electric 

 Oscillations in Straight Wires and Solenoids 265 



Prof. F. Horton ou the Effect of an Electric Current on the 

 Photoelectric Effect 279 



Dr. B. C. Laws on the Strength of the Reinforced Thin-plate 

 Beam, held at its ends, and subject to a uniformly dis- 

 tributed Load — Special Case 281 



Mr. I. V. Margary on the Periodic Table. A Modification 

 more in accord with Atomic Structure 287 



NUMBER CCXLIX.— SEPTEMBER. 



Miss Marian Baxter on Dispersion of Light by Potassium 

 Vapour. (Plate XL) ." 289 



Mr. 8. J. Plimpton on the Scattering of Rays in X-ray 

 Diffraction < . . . . 302 



Prof. W. D. Harkins on the Constitution and Stability of 

 Atom Nuclei. (A Contribution to the Subject of Inorganic 

 Evolution.) (Plate XII.) , 305 



