392 Proceedings at the Meetings. 



5. On a relation between the velocity and the volume of the ions 

 of certain organic acids and bases. By T. H. Laby and G. A. Carse. 

 (Communicated by Professor Thomson.) 



6. A preliminary note on the maiotic phenomena in the eggs of 

 the Hermaphrodite Angiostomum nigrovenosum (Ascaris nigrovenosa). 

 By S. A. McDowall, B.A., Trinity College. 



7. On the reduction of the general ternary quintic to Hibbert's 

 canonical form. By H. W. Richmond, M.A., King's College. 



April 30th, 1906. 

 In the Optical Lecture Room. 



Mr J. J. Lister in the Chair. 



The following Communications were made : 



1. Demonstration of new apparatus for Psychological Tests. By 

 W. H. R. Rivers, M.A, St John's College. 



2. On the measurement of the earth-air current and on the origin 

 of atmospheric electricity. By C. T. R. Wilson, M.A., Sidney Sussex 

 College. 



3. A class of Integral Equations. By H. Bateman, M.A., Trinity 

 College. 



4. A suggestion as to the nature of the horny teeth of the Marsi- 

 fobranchii. By H. W. Marett Tims, M.A., King's College. 



May Uth, 1906. 



In the Optical Lecture Room. 



Dr Penton in the Chair. 



The following Communications were made : 



1. (1) The influence of a strong electro-magnetic field on the 

 spark spectra of palladium, rhodium and ruthenium. 



(2) Experiments on the band spectrum of nitrogen in a strong 

 electro-magnetic field. By J. E. Purvis, M.A., St John's College. 



2. On the ionization of gases exposed simultaneously to Rontgen 

 rays and the radiation from radio-active substances. By T. ISToda. 

 (Communicated by Professor Thomson.) 



