vi CONTENTS OF VOL. XXVIII. SIXTH SERIES. 



Page 

 Lord Eayleigh : Further Eeinarks on the Stability of Viscous 

 Fluid Motion 609 



Sir J. J. Thomson on the Production of Soft Eontgen Eadia- 



tion by the Impact of Positive and Slow Cathode Eays . . 620 

 Prof. W. H. Bragg and Mr. S. E. Peirce on the Absorption 



Coefficients of X Eays 626 



Dr. A. van den Broek : Ordinals or Atomic Numbers ? . . . . 630 

 Proceedings of the Geological Society : — 



Prof. J. W. Gregory on the Structure of the Carlisle- 

 Solway Basin 632 



NUMBEE CLXYII.— NOVEMBEE, 



Prof. O. W. Eichardson on the Distribution of the Molecules 

 of a Gas in a Field of Force, with Applications to the 

 Theory of Electrons 633 



Mr. G. H. Livens on the Statistical Relations of Eadiant 

 Energy 648 



Mr. J. Eice : Note on the Form assumed by the Eed Cor- 

 puscles of the Blood, or by the Suspended Particles in a 

 Lecithin Emulsion 5 . . 664 



Dr. J. E. Wilton on Figures of Equilibrium of Eotating 

 Fluid under the restriction that the Figure is to be a 

 Surface of Eevolution e 671 



Mr. W. H. Jenkinson on Concentration Cells in Ionized 

 Gases 685 



Prof. E. P. Adams and Mr. Albert K. Chapman on the 

 Corbino Effect 692 



Sir Joseph Larmor on the Eeflexion of Electromagnetic 

 Waves by a moving perfect Eeflector, and their Mechanical 

 Eeaction 702 



Messrs. Herbert E. Ives and Edwin F. Kingsbury on the 

 Theory of the Flicker Photometer 708 



Dr. G. A. Shakespear : Experiments on the Resistance of 

 the Air to Falling Spheres 728 



Prof. W. M. Thornton on the Least Energy required to start 

 a Gaseous Explosion. (Plate XIII.) 734 



Dr. Margaret B. Moir on Permanent Magnetism of Certain 

 Chrome and Tungsten Steels 738 



Mr. J. G. Stewart on the Inapplicability of Boltzmann's 

 Equipartition Hypothesis to Gases in a State of Change 

 of Internal Energy ; and its bearing on the experimental 

 determination of the Specific Heat of Gases 748 



Mr. F. H. Newman on the Ionization Potential of Mercury 

 Vapour 753 



Mr. G. H. Livens on the Theories of Eotational Optical 

 Activity 756 



