viii Contents. 



The decomposition of Hydrogen Dioxide under the influence of Radium 



Bromide. By H. J. H. Fenton 424 



Exhibition of Oribatid Mites taken in the neighbourhood of Cambridge. 



By C. Warburton and N. D. F. Pearce . 427 



Some observations upon the Determination of Sex in Plants. By R. P. 



Gregory. (Communicated by Mr W. Bateson) .... 430 

 On Variation in the Number and Arrangement of the Male Genital 

 Apertures and on the Proportion of the Sexes in the Norway Lobster 

 (Nephrops norvegicus). By D. C. McIntosh. (Communicated by 



Mr Francis H. A. Marshall) 441 



The Boiling Points of Homologous Compounds. By Hugh Ramage . 445 



On Partial Fractions. By A. C. Dixon 449 



Note on Plane Unicursal Curves. By A. C. Dixon 454 



On the Order of Certain Systems of Conditions. By A. C. Dixon . . 458 

 Electrical Oscillations in Wires. By H. C. Pocklington . . . 461 

 Metallic "Passivity" in relation to Time and Temperature. By Dr 



W. A. Hollis " . .462 



Note on Compounds containing an Asymmetric Nitrogen and an Asym- 

 metric Carbon Atom. By H. 0. Jones . . . • . . 466 

 Quasi-Radio-activity produced by the Point Discharge. By S. A. Edmonds 469 

 On the Early Development of the Unfertilized Egg in the Sawfly, Nematus 



ribesii. By L. Doncaster 474 



Effect of Screening on Ionisation in Closed Vessels. By A. Wood . .477 

 On the Proportion of the Sexes among the Todas. By R. C. Punnett. 



With a Note by W. H. R. Rivers . . . - . . . .481 

 The Spatial Configuration of Trivalent Nitrogen Compounds. By H. 0. 



Jones and J. P. Millington 489 



On the Magnetic Deflexion of the Negative Current of Electricity from a 



hot Platinum Wire at low pressures. By Gwilym Owen . . . 493 

 On the Absorption of Ultra-violet Light in different Oases. By W. 



Mansergh Varley 510 



Proceedings at the Meetings held during the Session 1903 — 1904 . . 517 

 Index 523 



PLATES. 



Plates I and II. To illustrate Mr Purvis' paper 206 



Plate III. To illustrate Messrs Marshall and Annandale's paper . . 297 



Plate IV. To illustrate Professor Liveing's paper 339 



