IV CONTENTS OF VOL. XXXIX. SIXTH SERIES. 



NUMBER COXXX.— FEBRUARY. 



Page 

 Dr. L. Silberstein on the recent Eclipse Eesults and Stokes- 



Planck's JEther 161 



Sir Oliver Lodge on a Possible Structure for the Ether 170 



Prof. A. Anderson on the Spheroidal Electron. . 175 



Dr. Norman .Campbell on the Adjustment of Observations. I. 177 

 Dr. J. Prescott on the Buckling of Deep Beams. (Second 



Paper.) With an Appendix by Mr. H. Carrington 194 



Miss Alice Everett on a Simple Property of a Eefracted Kay. 223 

 The late Lord Eayleigh on Eesonant Reflexion of Sound 



from a Perforated Wall , 225 



Dr. D. N. Mallik and Prof. A. B. Das on the Quantum 



Theory of Electric Discharge 233 



Dr. G-. Eudorf on Latent Heat and Surface Energy 238 



Notices respecting New Books :— 



J. de Graaf Hunter's The Earth's Axes and Triangula tion. 239 



NUMBER CCXXXL— MARCH. 



Mr. G. A. Hemsalech on the Excitation of the Spectra of 

 Carbon, Titanium, and Vanadium by Thermelectronic 

 Currents. With special Reference to the Cause of Emis- 

 sion of Light Radiations by Luminous Vapours in the 

 Carbon Tube Resistance Furnace. (Plates IT.-V.) 241 



Mr. E. T. Bell on Parametric Solutions for a Fundamental 

 Equation in the general Theory of Relativity, with a Note 

 on similar Equations in Dynamics 285 



Mr. J. Tykocinski-Tykociner on the Mandelstain Method 

 of Absolute Measurement of Frequency of Electrical 

 Oscillations ' 289 



Mr. L. C. Jackson on Variably Coupled Vibrations : Gravity- 

 Elastic Combinations. Masses and Periods equal. (Plates 

 VI. & VII.) . . 294 



Mr. Take Sone on the Magnetic Susceptibilities of Hydrogen 

 and some other G-ases 305 



Mr. Gilbert Cook : An Experimental Determination of the 

 Inertia of a Sphere moving in a Fluid 350 



Mr. F. Bates on a New Cadmium- Vapour Arc Lamp 353 



Mr. S. P. Owen on Radiation from a Cylindrical Wall 359 



Dr. L. Silberstein on the Measurement of Time— a Rejoinder 

 to Dr. N. Campbell ... 366 



