viii 



Page 



The Spectrum of the Radium Emanation. By Sir William Ramsay, 



K.C.B., F.R.S., and Professor J. Norman Collie, F.R.S 470 



Notes on the Statolith Theory of Geotropism. I. Experiments on the 

 Effects of Centrifugal Force. II. The Behaviour of Tertiary Roots. 

 By Francis Darwin, F.R.S., and D. F. M. Pertz 477 



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. 

 (Abstract) 490 



Bakerian Lecture. — The Succession of Changes in Radio-active Bodies. 

 By E. Rutherford, F.R.S., Macdonald Professor of Physics, McGill 

 University, Montreal. (Abstract) 493 



On the Electric Equilibrium of the Sun. By Svante Arrhenius. Com- 

 municated by Sir William Huggins, Pres. R.S 496 



No. 496.— July 7, 1904. 



Studies on Enzyme Action. II. — The Rate of the Change, conditioned 

 by Sucroclastic Enzymes, and its Bearing on the Law of Mass 

 Action. By Edward Frankland Armstrong, Ph.D., Salters' Company's 

 Research Fellow, Chemical Department, City and Guilds of London 

 Institute, Central Technical College. Communicated by Professor 

 H. E. Armstrong, F.R.S 500 



Studies on Enzyme Action. III. — The Influence of the Products of 

 Change on the Rate of Change conditioned by Sucroclastic Enzymes. 

 By Edward Frankland Armstrong, Ph.D., Salters' Company'^ 

 Research Fellow, Chemical Department, City and Guilds of London 

 Institute, Central Technical College. Communicated by Professor 



IT. E. Armstrong, F.R.S 516 



Studies on Enzyme Action. IV. — The Sucroclastic Action of Acids 

 as contrasted with that of Enzymes. By Edward Frankland 

 Armstrong, Ph.D., Salters' Company's Research Fellow, and Robert 

 John Caldwell, B.Sc, Clothworkers' Scholar, Chemical Department, 

 City and Guilds of London Institute, Central Technical College. 

 Communicated by Professor H. E. Armstrong, F.R.S 526 



Enzyme Action as bearing on the Validity of the Ionic-Dissociation 

 Hypothesis and on the Phenomena of Vital Change. By Henry E. 

 Armstrong, Ph.D., F.R.S 537 



Index 543 



