CONTENTS. 



(A) 



VOL 204. 



List of Illustrations page v 



Advertisement . '. vii 



I. The Effects of Changes of Temperature on the Modulus of Torsional Rigidity of 



Metal Wires. By FRANK HORTON, D.Sc., B.A., St. John's College, Cambridge; 

 1851 Exhibition Research Scholar of the University of Birmingham. Com- 

 municated by Professor J. 'J. THOMSON, F.R.S. page 1 



II. On the Construction of some Mercury Standards of Resistance, unth a 



Determination of the Temperature Coefficient of Resistance of Mercury. 

 By F. E. SMITH, A.R.C.Sc., Assistant at the National Physical Laboratory. 

 Communicated by R. T. GLA/EBKOOK, F.R.S. (From the National Physical 

 Laboratory) 57 



III. On the Electric Effect of Rotating a Dielectric in a Magnetic Field. By 



HAROLD A. WILSON, M.A., D.Sc., Fellow of Trinity College, Cambridge. 

 Communicated by Professor J. J. THOMSON, F.R.S. 121 



IV. On Flame Syx-ctra. By CHARLES DE WATTEVILLE. Communicated by ARTHUR 



SCHUSTER, F.R.S. 139 



V. BAKERIAN LECTURE. Tlie Succession of Changes in Radioactive Bodies. By 



Professor E. RUTHERFORD, F.R.S. , Macdonald Professor of Physics, McGill 

 University, Montreal 169 



VI. On the General Theory of Integration. By W. H. YOUNG, Sc.D., St. Peter's 



College, Cambridge. Communicated by Dr. E. W. HOBSON, F.R.S. . . 221 



a 2 



