viii Contents 



PAGE 



The pressure in a viscous liquid moving throiigh a channel ivith diverging 

 boundaries. By W. J. Harrison, M.A., Fellow of Clare College, 

 Cambridge. (One fig. in Text) 307 



The Effect of Ions on Ciliary Motion. By J. Gray, M.A., Fellow of 



King's College, Cambridge ........ 313 



A Note on Photosynthesis and Hydrogen Ion Concentration. By J. T. 



Saunders, M.A., Christ's College 315 



The distribution of intensity along the loosiiive ray parabolas of atoms and 

 molecules of hydrogen and its possible explanation. By F. W. Aston, 

 M.A., Trinity College (D.Sc., Birmingham), Clerk-Maxwell Student 

 of the University of Cambridge. (Three figs, in Text) . . . 317 



Gravitation and Light. By Sir Joseph Larmor, St John's College, 



Lucasian Professor 324 



On a Micro-voltameter. By C. T. R. Wilson, M.A., Sidney Sussex College 345 



The self-oscillations of a Thermionic Valve. By R. Whiddington, M.A., 



St John's College 346 



Proceedings at the Meetings held during the Session 1918 — 1919 . . 347 



Index to the Proceedings with references to the Transactions . . 350 



