520 Proceedings at the Meetings. 



February 1st, 1904. 



In the Optical Lecture Room. 



Dr Baker, President, in the Chair. 



The following was elected a Fellow of the Society : 



T. H. Havelock, B.A., St John's College. 



The following Communications were made : 



1. Free-living fresh- water New Zealand Nematodes. By N. A. 

 Cobb. (Communicated by Mr A. E. Shipley.) 



2. Some High Andine and Antarctic Umbelliferae. By A. W. 

 Hill, M.A., King's College. 



3. On the Relative Amount of Ionization produced in Air and 

 Hydrogen by Rontgen Bays. By R. K. McClung, B.A., Trinity 

 College. (Communicated by Professor Thomson.) 



February loth, 1904. 



In the Cavendish Laboratory. 



Dr Baker, President, in the Chair. 



The following Communications were made : 



1. On the presence of a radio-active constituent in various sub- 

 stances. By J. J. Thomson, M.A., Trinity College, Professor of 

 Experimental Physics. 



2. On the temperature effect on the rate of combination of 

 hydrogen and chlorine. By P. V. Bevan, M.A., Trinity College. 



3. On the Convection of Heat. By H. A. Wilson, M.A., Trinity 

 College. 



4. On the calculation of capacities in terms of the coefficients of 

 electrostatic induction. By G. F. C. Searle, M. A., Peterhouse. 



