CONTENTS. 



VOL. XVII. 



Ko. 



1. Experiments on the Electrification produced by Breaking up 



Water, with Special Application to Simpson's Theory of the 

 Electricity of Thunderstorms. By Professor J. J. Nolan, m.a. 

 D.sc, and J. Enright, b.a., m.sc, University College, Dublin, 

 (June, 1922.) 



2. Cataphoresis of Air-Bubbles in Various Liquids. By Thomas A 



McLaughlin, m.sc, a.inst.p., University College, Galway. 

 (June, 1922.) 13 



3. On the Aeration of Quiescent Columns of Distilled Water and of 



Solutions of Sodium Chloride. By Professor W. E. Adeney, 

 a.r.c.sc.i., d.sc, p.i.c ; De. a. G. G. Leonard, e.r.csc.i., b.sc, 

 p.i.c. ; and A. Eichardson, a.r.c.sc.i., a.lc. (June, 1922.) . 19 



i. On a Phytophthora Parasitic on Apples which has both Amphigy- 

 nous and Paragynous Antheridia ; and on Allied Species which 

 show the same Phenomenon. By H. A. Lapferty and George 

 H. Pethybridge, Seeds and Plant Disease Division, Depart- 

 ment of Agriculture and Technical Instruction for Ireland. 

 (Plates I and II.) (June, 1922.) . . . .29 



5. Some Further Notes on the Distribution of Activity in Radium 



Therapy. By H. H. Poole, m.a., sc.d. (June, 1922.) . 45 



6. Preliminary Experiments on a Chemical Method of Separating 



the Isotopes of Lead. By Thomas Dillon, d.sc.; Eosalind 

 Clarke, d.sc ; and Victor M. Hinchy, b.sc (Chemical Depart- 

 ment, University College, Galway). (July, 1922.) . . 53 



7. The Lignite of Washing Bay, Co. Tyrone. By T. Johnson, d.sc, 



F.L.S., Professor of Botany, Royal College of Science for 

 Ireland; and Jane G. Gilmore, b.sc (Plate III.) (August, 

 1922.) 59 



8. Libocedrus and its Cone in the Irish Tertiary. By T. Johnson, 



D.sc, F.L.S., Professor of Botany, Royal College of Science for 

 Ireland; and Jane G. Gilmore, b.sc (Plate IV.) (August, 

 1922.) 66 



