vi Contents. 



No. PAGE. 



32. On the Extraction of Sap from living Leaves by means of Com- 



pressed Aii\ By Heney H. Dixon, sc.d.^ f.r.s., Professor of 

 Botany in tlie University of Dublin ; and Nigel G. Ball, m.a., 

 Assistant to the Professor of Botany, University of Dublin. 

 (December, 1923.) 263 



33. Some Experiments on the Convection of Heat in Vertical Water 



Columns. By H. H. Poole, sc.d. (December, 1923.) . 267 



34. On the supposed Homology of the Golgi Elements of the Mam- 



malian Nerve Cell, and the Nebenkern Batonettes of the Genital 

 Cells of Invertebrates. By P. W. Rogers Brambell, b.a., 

 SC.D. (dubl.), and J. Bronte Gatenby, m.a. (dubl.), d.phil. 

 (oxoN.), D.sc. ■ (LOND.). (Plate XVII.) (December, 1923.) . 275 



35. Phototropic Movements of Leaves — The Functions of the Lamina 



and the Petiole with regard to the Perception of the Stimulus. 

 By Nigel Ball, m.a.. Assistant to the Professor of Botany in 

 the' University of Dublin. (December, 1923.) . . . 281 



36. The Action of the Oxides and the Oxyacids of Nitrogen on Phenyl- 



benzylether. By Hugh Ryan, d.sc, and John Keane, ph.d.. 

 University College, Dublin. (February, 1924.) . . 2S7 



37. The Action of the Oxides and the Oxyacids of Nitrogen on Ethyl- 



/3-naphthylether. By Hugh Ryan, d.sc, and John Keane, 

 PH.D., University College, Dublin. (February, 1924.) . . 297 



38. The Action of the Oxides and the Oxyacids of Nitrogen on Di- 



phenylethyleneether. By Hugh Ryan, d.sc, and Terence 

 Kenny, m.sc. University College, Dublin. (February, 1924) 305 



39. The Action of the Oxides and the Oxyacids of Nitrogen on Di- 



phenylether. By Hugh Ryan, d.sc, and Peter J. Dkumm, 

 M.sc, University College. (February, 1924.) . . 313 



40. The Action of the Oxides' and the Oxyacids of Nitrogen on Di- 



phenylene Oxide. By Hugh Ryan, d.sc, and Nicholas 

 Cullinane, PH.D., University College, Dublin. (February, 

 1924.) .321 



41. The Habitats of LimnMw tnmcatula and L. pereger in relation 



to Hydrogen Ion Concentration. By W. R. G. Atkins, o.b.e., 

 F.i.c, and Maree V. Lebour, d.sc, Marine Biological Labora- 

 tory, Plymouth. (February, 1924.) . . . • . 327 



42. Experiments on the Possible Effect of Vitamins on Quantity of 



Milk and Butter Fat. By E. J. Sheehy, f.r.csci., b.sc, 

 M.R.I.A., Biochemical Laboratory, D.A.T.I. (April, 1924.) . 333 



43. A Mechanical Device for Sealing off Radium Emanation Tubes. 



By H. H. Poole, SC.D. (July, 1924J . . . . 337 



