296 Proceedings at the Meetings. 



5. On the parametric I'epresentation of the co-ordinates of points 

 on a cube surface in space of four dimensions. By H. W. Richmond, 

 M.A., King's College. 



6. The irreducible concomitants of two quadratics in n a ariables. 

 By H. W. TuKXBULL, B.A. (Communicated by Dr Barnes.) 



Mai/ onl 1909. 

 In the Botany School. 



Dr Hobsox, Yice-Pbesident, in the Chaik. 

 The following Communications were made : 



1. On a specimen of the cone Calamostachys hinneyaxa Oarruthers. 

 By H. H. Thomas, B.A., Downing College. (Communicated by 

 Mr E. A. N. Arber.) 



2. Note on two new leeches from Ceylon. By W. A. Harding, 

 M.A., Peterhouse. 



3. I^Tote on an abnormal pair of appendages in Lithobius. By 

 L. DoNCASTER, M.A., King's College. 



Jr. On a property of summable functions. By Dr A. C. Dixon. 



Maij 17 th, 1909. 

 In the Cavendish Laboratory. 

 Professor Sir J. J. Thomson, Vice-President, in the Chair. 



The following Communications were made : 



1. Phenomena of X-ray Transmission. By C. G. Bakkla, M.A., 

 King's College. (Communicated by Professor Sir J. J. Thomson.) 



2. Phenomena of the Cathode Discharge. By J. A. Orange, B.A., 

 Trinity College. (Communicated by Professor Sir J. J. Thomson.) 



3. Some fatigue effects of the Cathode in a dischax'ge tube. By 

 R. Whiddington, B.A., St John's College. (Commimicated by Pro- 

 fessor Sir J. J. Thomson.) 



-1:. The intiuence of dilution on the color and the absorption 

 spectra of various permanganates. By J. E. Purvis, M.A., St John's 

 College. 



5. Note on the Histology of the ' Giant ' and ordinary Forms of 

 Frimula sinens^i^. By R. P. Gregory, M.A., St John's College. 



