CONTENTS OF VOL. X 



(SIXTH SEEIES). 



NUMBER LV.— JULY 1905. 



Page 



Mr. P. S. Barlow : Osmotic Experiments on Mixtures of 



Alcohol and Water 1 



Mr. E. A. Houstoun on the Effect of a Surface-Eilrn in Total 



Reflexion : 12 



Mr. R. A. Houstoun on Total Reflexion at the Second Surface 



of a Thin Plane Parallel Plate 24 



Mr. S. H. Burbury : Lord Rayleigh on the Virial Equation . . 33 

 Dr. T. Godlewski on Actiuium and its Successive Products . . 35 

 Dr. T. Godlewski on some Radioactive Properties of Uranium. 45 



Mr. J. W. Sharpe on the Boomerang 60 



Mr. J. Peck on the Effect, of a Transverse Magnetic Eield on 



the Discharge of Electricity through a Vacuum-Tube .... 67 

 Prof. D. B. Brace on the Negative Results of Second and 



Third Order Tests of the "iEther Drift," and Possible First 



Order Methods 71 



Prof. A. Wehnelt on the Discharge of Negative loos by 



Glowing Metallic Oxides, and Allied Phenomena 80 



Mr. J. H. Jeans on the Partition of Energy between Matter 



and iEther 91 



Mr. A. S. Eve on the Radioactive Matter present in the 



Atmosphere 98 



Mr. J. Morrow on the Lateral Vibration of Bars of Uniform 



and Varying Sectional Area. 113 



Dr. G. J. Stoney on 'An Optical Paradox'. .' 126 



Dr. W. Watson on the Determination of the Moment of 



Inertia of the Magnets used in the Measurement of the 



Horizontal Component of the Earth's Eield 130 



Dr. E. H. Barton and Mr. C. A. B. Garrett on the Vibration 



Curves simultaneously obtained from a Monochord Sound- 



Box and String (Plate I.) 149 



Mr. H. C. Jones on the Theory of Electrolytic Dissociation : 



A Correction 157 



