252 Proceedings at the Meetings. 



k 



2. On the Diathermancy of Antimonite. By A. Hutchinson, 

 M.A., Pembroke College. 



3. On the Potential difference between the terminals of a Vacuum 

 tube. By W. A. D. Rudge, M.A., St John's College. 



4. The determination of curves satisfying given conditions. By 

 H. Batbman. (Communicated by Mr H. M. Macdonald.) 



5. On the Existence of a Radio-active Gas in the Cambridge tap- 

 water. By J. J. Thomson, M.A., Trinity College, Cavendish Professor 

 of Experimental Physics. 



6. On a continuous spectrum. By T. H. Havelock. (Communi- 

 cated by Professor Thomson.) 



7. On the Thomson-effect in alloys of Bismuth and Tin. By S. C. 

 Laws. (Communicated by Professor Thomson.) 



8. A preliminary account of an Investigation of the effect of 

 Temperature on the Ionisation of gases by Rontgen Rays. By 

 R. K. McClung. (Communicated by Professor Thomson.) 



May 18th, 1903. 



In the Optical Lecture Room. 



Dr Baker, President, in the Chair. 

 The following was elected a Eellow of the Society : 

 T. H. Middleton, M.A., St John's College, Professor of Agriculture. 

 The following Communications were made : 



1. A Coleopterous insect embedded in the wall of the human 

 intestine. By L\ Sharp, M.A. 



2. Exhibition of a rare Parasite. By A. E. Shipley, M.A., 

 Christ's College. 



3. On the influence of Electrons on Colloidal solutions. By 

 W. B. Hardy, M.A., Gonville and Caius College. 



4. On Bismuth. By R. H. Adie, M.A., Trinity College. 



5. (1) On the influence of great dilution on the absorption spectra 

 of highly concentrated solutions of the nitrates and chlorides of 

 Didymium and Erbium. (2) On a method of estimating the amounts 

 of the oxides of Didymium and Erbium by means of the absorption 

 bands of their solutions. By J. E Purvis, M.A., St John's College. 



6. A lecture experiment to illustrate the rotation of a magnetic 

 pole around a straight current. By P. V. Bevan, M.A., Trinity 

 College. 



7. Irreversible simultaneous linear Reactions. By H. O. Jones, 

 M.A., Clare College, and O. W. Richardson, B.A., Trinity College. 



