380 Proceedings at the Meetings. 



January 22nd, 1900. 



In the Optical Lecture Room. 



Mr J. Larmor, President, in the Chair. 

 The following was elected a Fellow of the Society : 



J. G. Leathern, M.A., St John's College. 



The Balance Sheet for the year 1899 was presented and laid on the 

 table. 



Mr F. Darwin proposed a vote of thanks to the Auditors ; this was 

 seconded by Mr Bateson and carried unanimously. 



The following Communications were made : 



1. Experiments on the periodic movement of Plants. By Miss 

 D. F. M. Pertz and F. Darwin, M.A., Christ's College. 



2. Wealden Plants from Bernissart. By A. C. Seward, M.A., 

 Emmanuel College. 



3. Bulgaria polymorpha as a wood-destroying Fungus. By R. H. 

 Biffen, B.A., Emmanuel College. 



February bth, 1900. 



In the Cavendish Laboratory. 



Mr J. Larmor, President, in the Chair. 



The following were elected Fellows of the Society : 



Professor W. Somerville, M.A., King's College. 

 W. McDougall, M.A., St John's College. 

 Hon. N. C. Rothschild, B.A., Trinity College. 



The following Communications were made : 



1. Ionization of Gases in the Electric Field. By Professor 

 J. J. Thomson, Trinity College. 



