CONTENTS OF VOL. X.— SIXTH SERIES. V 



Page 

 Mr. K. Honda on a Porta Die Aero-mercurial Tide- Gauge. 

 (Plates III. & IV.) 253 



Mr. F. W. Lanchester on the Pendulum Accelerometer, an 

 Instrument for the Direct Measurement and Recording of 



Acceleration 260 



Mr. R. V. Stanford on a new Porm of Pyknometer 269 



Dr. A. D. Denning on a Simple Method of Determining the 



Radiation Constant : suitable for a Laboratory Experiment. 270 

 Notices respecting New Books : — 



Dr. V. Goldschmidt's Ueber Harmonie und Complication, 



and Ueber harmonische Analyse von Musikstiicken . . 279 

 O. Linders' Die Pormelzeichen 284 



NUMBER LVIL— SEPTEMBER. 



Lord Kelvin on the Statistical Kinetic Equilibrium of Ether 



in Ponderable Matter, at any Temperature 285 



Prof. E. Rutherford on Slow Transformation Products of 



Radium 290 



Dr. C. Chree : Deductions from Magnetic Disturbances at 



Greenwich 306 



Prof. W. H. Bragg and Mr. R. Kleeman on the a. Particles 



of Radium, and their Loss of Range in passing through 



various Atoms and Molecules 318 



Prof. Dr. J. Traube on the Space occupied by Atoms : The 



Theories of Th. W. Richards and J. Traube 340 



Mr. W. A. Price : The Electrical Resistance of a Conductor 



the Measure of the Current passing 352 



Lord Rayleigh on the Momentum and Pressure of Gaseous 



Vibrations, and on the Connexion with the Virial Theorem. 364 

 Dr. T. Godlevvski on the Absorption of the j3 and y Rays of 



Actinium , 375 



Prof. A. M. Worthington on a Eundamental Experiment in 



Electricity , 380 



Prof. D. B. Brace on the iEther "Drift''" and Rotary 



Polarization 383 



Mr. R. T. Lattey on the Mutual Solubilities of Diethvlamine 



and Water * 397 



Notices respecting New Books : — 



E. Gerard's Legons sur l'Electricite 400 



The late Sir G. G. Stokes's Mathematical and Physical 

 Papers, Vol. V .".... 400 



