CONTENTS OF VOL. XLII. SIXTH SERIES. V 



Page 



Mr. J. H. J. Poole on a Possible Connexion between the 

 Magnetic State of Iron and its Photo-Electric Properties. . 339 



Mr. Yngve Bjornstahl on Magnetic Double Refraction of 

 Gold Colloids. (Plate XIII.) . 352 



Dr. Dorothy Wrinch and Dr. H. Jeffreys on Certain Funda- 

 mental Principles of Scientific Inquiry 369 



Mr. V. A. Bailey on the Mental Multiplication and Division 

 of Large Numbers , , 390 



Messrs. Kei Iokobe and Sukeaki Sakai on the Effect of Tem- 

 perature on the Modulus of Rigidity, and on the Viscosity 

 of Solid Metals 397 



Mr. A. Miiller on an X-Ray Bulb with a Liquid Mercury 

 Anticathode, and on Wave-Length Measurements of the 

 L-Spectrum of Mercury. (Plate" XIY.) 419 



Mr. W. Hughes on the Application of the Law of Mass Action 

 to Strong Electrolytes, and the derivation of the general 

 equation of the ionization isotherm 428 



Dr.T. J. la. Bromwich on Units and the Theory of Relativity. 431 



Dr. T. J. Pa. Bromwich on the Problem of Random Flights. 432 



Dr. F. W. Aston on the Mass Spectra of the Alkali Metals. 

 (Plate XV.) 436 



Prof. H. M. Dadourian on the Temperature Coefficient of the 

 Modulus of Longiudinal Elasticity of Steel 442 



Dr. S. H. C. Briggs on the Elements regarded as Compounds 

 of the First Order 44* 



Messrs. C. H. Bosanquet and H. Hartley on the Angle of 

 Contact 456 



Mr. Snehamoy Datta on the Variation of Resistance of 

 Selenium with Temperature 463 



D . H. Jeffreys on the Effect of Gravitation on Light 470 



Proceedings of the Geological Society 471 



NUMBER CCL.— OCTOBER. 



Dr. D. A. Keys on a Piezoelectric Method of Measuring Ex- 

 plosion Pressures. (Plate XVI.) 473 



Dr. H. H. Poole on the Electrical Conductivity of some 

 Dielectrics 488 



Mr. A. A. Campbell Swinton on the Reception of Wireless 

 Waves on a Shielded Frame Aerial 502 



Prof. A. Anderson on Neumann's Law of Electromagnetic 

 Induction 506 



Prof. A. Anderson on the Convection Coefficient in a Dis- 

 persive* Medium 509 



Prof. W. B. Morton on the Forms of Planetary Orbits on the 

 Theory of Relativity 511 



Dr. H. Stanley Allen on Faraday's " Magnetic Lines " as 

 Quanta. — Part 1 503 



Mr. O. H. Henderson on the Range and Ionization of the 

 a Particles from Radium C and Thorium C. (Plate XVII.) 538 



