iv Contents. 



No. PAGE. 



9. The Electrical Design of A.C. High Tension Transmission Lines. 



By H. H. Jeffcott. (August, 1922.) . . . .71 



10. The Occurrence of Helium in the Boiling Well at St. Edmunds- 



bury, Lucan. By A. G. G. Leonard, f.r.c.sc.l, ph.d., f.i.c, and 

 A. M. RicHAEDSON, A.K.c.sc.L, A.i.c. (Plate V.) (August, 

 1922.) 89 



11. On the Detonating Action of a Particles. By H. H. Poole, m.a., 



sc.D. (December, 1922.) . . . . .93 



12. The Variations of Milk Yield with the Cow's Age and the Length 



of the Lactation Period. By James Wilson, m.a., b.sc. 

 (December, 1922.) . . . . . .97 



13. A Note on Growth and the Transport of Organic Substances in 



Bitter Cassava {Manihot utilissima). By T. G. Mason, m.a., 

 B.sc. (December, 1922.) . . . . . 105 



14. The Action of the Oxides and the Oxyacids of Nitrogen on 



Diphenylurethane. By Hugh Ryan, d.sc, and Anne 

 Donnellan, m.sc, University College, Dublin. (February, 

 1923.) 113 



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



o-tolyurethane. By Hugh Ryan, d.sc, and Nicholas 

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

 1923.) . 119 



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



phenylurethane. By Hugh Ryan, d.sc, and Anna Connolly, 

 M.sc, University College, Dublin. (Pebruaiy, 1923.) . 125 



17. The Action of the Oxides and the Oxyacids of Nitrogen on Plienyl- 



benzylurethane. By Hugh Ryan, d.sc, and James L. 

 'Donovan,- M.sc, University College, Dublin. (February, 

 1923.) 131 



18. The Action of the Oxides and the Oxyacids of Nitrogen on the 



Phenylureas. By Hugh Ryan, d.sc, and Peter K. 'Toole, 

 M.sc, University College, Dublin. (Pebruaiy, 1923.) . . 139 



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



methylurea. By Hugh Ryan, d.sc, and Michael J. Sweeney, 

 m.sc, University College, Dublin. (February, 1923.) . . 157 



20. On the Cause of Rolling in Potato Foliage; and on some further 



Insect Carriers of the Leaf-roll Disease. By Paul A. Murphy, 

 sc.D., a.k.c.sc.i., Seeds and Plant Disease Division, Department 

 of Agriculture and Technical Instruction for Ireland. 

 (Plate VI.) (May, 1923.) . . . . . 163 



