Proceedings at the Meetings 489 



February 28, 1921. 



In tlie Cavendish Laboratory. 

 Prof. Sir Ernest Rutherford, Vice-President, in the Chair. 



The following were elected Fellows of the Society : 



G. E. Briggs, M.A., St John's College. 



H. T. H. Piaggio, Sc.D., St John's College. 



The following Communications were made to the Society : 



1. On the nature of crystal-reflection of X-rays. By Professor Sir 

 Joseph Larmor. 



2. An experiment on focal lines formed by a Zone plate. By G. F. C. 

 Searle, Sc.D., Peterhouse. 



3. The origin of the disturbances in the initial motion of a shell. 

 By R. H. Fowler, M.A., Trinity College, and C. N. H. Lock, B.A., 

 Gonville and Caius College. 



4. On the latent heats of Vaporisation. By E. K. Rideal, M.A., 

 Trinity Hall. 



March 7, 1921. 

 In the Comparative Anatomy Lecture Room. 



Professor Seward, President, in the Chair. 



The following was elected a Fellow of the Society : 



R. E. Holthum, B.A., St John's College. 



The following was elected an Associate of the Society: 

 A. Harrison White. 



The following Communications were made to the Society : 



1. A peculiar case of heredity in the Sweet Pea. By Professor 

 Punnett. 



2. («) Insect Oases. 



(b) Wing Teratologies in Diptera. By C. G. Lamb, M.A., Clare 

 College. 



3. Some Alcyonaria in the Cambridge Museum. By S. J. Hickson, 

 M.A., Downing College. (Communicated by Mr H. H. Brindley.) 



4. The Mechanism of Ciliary Movement. By J. Gray, M.A., King's 

 College. 



5. The influence of function on the conformation of bones. By 

 A. B. Appleton, M.A., Downing College. 



6. A Note on the Hydrogen Ion Concentration of some Natural 

 Waters. By J. T. Saunders, M.A., Christ's College. 



