CONTENTS OF VOL. IX. SIXTH SERIES. Vll 



NUMBER LI V.— JUNE. 



Page 



Lord Kelvin on Deep "Water Ship-Waves 733 



Prof. J. A. Fleming on the Application of the Cymometer to 

 the Determination of the Coefficient of Coupling of Oscil- 

 lation Transformers. (Plate XI.) 758 



Mr. P. Soddy on the Production of Eadium from Uranium . . 768 



Lord Eayleigh on an Optical Paradox 779 



Mr. W. Sutherland on a Dynamical Theory of Diffusion for 



Non-Electrolytes and the Molecular Mass of Albumin. . . . 781 

 Dr. C. Chree on the Stresses in the Earth's Crust before and 



after the Sinking of a Bore-hole 785 



Mr. Gr. T. Bennett on the Parallel Motion of Sarrut and 



some Allied Mechanisms 803 



Dr. C. H. Lees on the Depression due to a Load at the 

 Centre of an Elastic Chain tightly stretched between Two 



Points in the same Horizontal Plane 811 



Notices respecting New Books : — 



E. Wiedemann & H. Ebert's Phvsikalisches Praktikum . 817 



Prof. J. J. Thomson's Elektrizitiit und Materie 817 



Proceedings of the Geological Society : — 



Lord Avebury on an Experiment in Mountain-Building. 818 

 Mr. L. Richardson on the Ehaetic Bocks of Monmouth- 

 shire 818 



Index 819 



