CONTENTS. 



(A) 

 VOL. 207. 



List of Illustrations . Mf , v 



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I. The lonisation Produced bij Hot Platinum in Different Gases. By O. W. 



RICHARDSON, M.A.. D.Sc., Fellow of Trinity College and Clerk -Max well 

 Student, Cambridge University. Communicated by Professor J. J. THOMSON, 

 F-R-S- page 1 



II. Second Memoir on the Compositions of Numbers. By Major P. A. MAcMAHON, 



R.A. t D.Sc.,F.R.S. 65 



III. On the Refractive Indices of Gaseous Potassium, /me, Cadmium, Mercury, 



Arsenic, Selenium and Tellurium. By C. CUTHBKRTSON and E. PARR 

 METCALKK, B.Sc. Communicated by Professor F. T. TROUTON, F.R.S. . 135 



IV. On the Discharge of Negative Electricity from Hot Calcium and from Lime. 



By FRANK HORTON, D.Sc., B.A., Fellow of St. John's College, and Cl<>rk- 

 Mti.riri-11 Student of tht Cfotwrnfy, Oambridge. Oammnuucated /</ /',../:.>, 

 J. J. THOMSON, F.R.S. , 1 49 



V. The Grtirit'itional Stability of the Earth. By A. E. H. LOVE, F.R.S., Sedleian 



Professor of Natural Philosophy in the University of Oxford . . . . 171 



VI. Investigation "of the Latv of Burning of Modified Cordite. By Major J. H. 



MANSKLI., Royal Artillery. Communicated by Sir A. NOBLE, F.R.S. . 243 



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