72 Mr. W. B. Hardy on Problems of Lubrication [Feb. 27, 



exploring the most difficult region of the physics of boundary zones — 

 namely, the surface energy of solids. It will, for instance, I believe, 

 enable us to prove that the simplest chemical change at the surface 

 of a metal takes place only when the surface energy is decreased 

 thereby. The film of oxide or sulphide which forms on copper acts 

 as a very effective lubricant, and it acts also like a grease film in 

 preventing water from wetting the surface : and from both of these 

 tacts we may conclude that the presence of the film lowers the surface 

 energy of the metal. 



[W. B. H.] 



GENERAL MONTHLY MEETING, 

 Monday, March 1, 1920. 



Sir James Crichtox-Browxe, J.P. M.D. LL.D. F.R.S., 



Treasurer and Vice-President, in the Chair. 



Sir William Henry Bragg, K.B.E. D.Sc. F.R.S. 



W. Carter, M.A. ' 



Mrs. Stanton Coit, 



Major-Gen. T. M. Corker, C.B. M.A. M.D. LL.D. 



J. F. Crowley, B.Sc. 



Captain Sir Charles Oust, Bt,, R.N. G.C.Y.O. C.B. C.M.G. 



Charles F. de Ganahl, 



Kenneth Gray, 



Miss A. N. Kershaw, B.Sc. 



Miss M. H. Kinnear, 



Miss Evelyn A. McGhee. 



Brig.-General Ernest Makins, C.B. D.S.O. 



Captain Horace George Mason, R.G.A. B.Sc. 



Clayton Conyers Morrell, M.D. 



Lady Rayleigh, 



William Bristow Saville, 



Ker George Russell Yaizev, 



Miss R. Y. Wagner, 



Frederick Womack, 



Lieut.-Col. Vincent Wright, D.Sc. F.R.G.S. 



were elected Members. 



