SCIENTIFIC PROCEEDmGS—coniinued. 



23. A New Principle in Blowpipe Construction. By H, G. Beckek, a.r.c.so.i.,, 



A.i.c, Demonstrator in the Royal College of Science, Dublin. (August, 

 1921.) 



24. Uncharged Nuclei produced in Moist Air by Ultra- Violet Light and other 



Sources. By the late Prof. J. A. McClelland, f.e.s., and J. J. M'Heney, 

 M.sc, University College, Dublin. (August, 1921.) 

 [Nos. 21 to 24, price 7s.] 



25. Biological Studies of Aj)his rumicis L. A. — Appearance of Winged Forms, 



B. — Appearance of Sexual Forms. By J. Davidson, d.sc. From the 

 Entomological Department, Institute of Plant Pathology, Eothamsted 

 Experimental Station, Harpenden, Herts. [Communicated by Professor 

 G. H. Carpenter.] (August, 1921.) 



26. The Occurrence of Dewalquea in the Coal-Bore at Washing Bay. By 



T. Johnson, d.sc, f.l.s., Professor of Botany, Royal College of Science for 

 Ireland, and .Jane G. Gilmobe, b.sc. (Plates XI, XII.) (August, 1921.) 



27. A Simple Form of Apparatus for observing the Kate of Reaction between 



Gases and Liquids, and its use in determining the Rate of Solution of 

 Oxygen by Water under different conditions of Mixing. By H. G. BEOKEBr 

 A.R.C.SO.I., a.i.c, Demonstrator in Chemistry, Royal College of Science, 

 Dublin. (August, 1921.) 



28. The Occurrence of a Sequoia at Washing Bay. By T. Johnson, d.sc, p.l.s.,- 



Professor of Botany, Royal College of Science for Ireland, and Jane G. 

 GiLMOEE, B.sc. (Plates XIII, XIV.) (August, 1921.) 



29. The Sources of Infection of Potato Tubers with the Blight Fungus, 



Pliijtophthora infestans. By Paul A. Murphy, b.a., a.e.cso.i.. Assistant 

 in the Seeds and Plant Disease Division, Department of Agriculture and 

 Technical Instruction for Ireland. (August, 1921.) 

 [Nos. 25 to 29, price 6s. 6rf.] 



30. Some Factors affecting the Hydrogen Ion Concentration of the Soil and its 



Relation to Plant Distribution. By W. R. G. Atkins, o.b.e., sc.d., f.i.c. 

 [Communicated by Professor H. H. Dixon, Sen., f.r.s. (February, 1922.) 



31. The Hydrogen Ion Concentration of Plant Cells. By W. R. G. Atkins, o.b.e.,. 



SC.D., f.i.c. [Communicated by Professor H. H. Dixon, sc.d., f.r.s. J 

 (February, 1922.) 



32. Note on the Occurrence of the Finger and Toe Disease of Turnips in Relation 



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

 sc.d., f.i.c [Communicated by Professor H. H. Dixon, sen., f.r.s.] 

 (February, 1922.) 



33. Photosynthesis and the Electronic Theory (II). By Henry H. Dixon, sc.d., 



f.r.s. , University Professor of Botany in Trinity College, Dublin ; and 

 Nigel G. Ball, m.a.. Assistant to the University Professor of Botany. 

 Trinity College, Dublin. (February', 1922.) 



34. The Bionomics of the Conidia of Phytophthora infestans (Mont.) de Bary. 



By Paul A. Murphy, b.a., a.e.o.sci.. Assistant in the Seeds and Plant 

 Disease Division, Department of Agriculture and Technical Instruction for 

 Ireland. (February, 1922.) 



[Nos. 80 to 34, price 7s.] 



35. On the Distribution of Activity in Radium Therapy under different conditions 



of Screening. By H. H. Poole, m.a., so.d. (April, 1922.) 

 36^ The Influence of Feeding on Milk Fat. By E. J. Sheehy, f.r.c.sci., b.sc. 

 (April, 1922.) 



37. On a New Method of Gauging the Discharge of Rivers. By J. Joly, sc.d., 



F.R.S., F.T.c.D. (April, 1922.) 



38. On a Variety of Pinite occurring at Ballycorus, Co. Dublin. By Louis B, 



Smyth, m.a., sc.b. (April, 1922.) 

 89. On the Life-History and Bionomics of the Flax Flea-Beetle {Longitarsus 

 I'anttlus, Payk.), with Descriptions of the hitherto unknown Larval and 

 Pupal Stages. By J. G. Rhynehart, a.e.c.sc.i., d.i.c, n.d.a. (Plates XV- 

 XIX.) (April, 1922.) 



[Nos. 35 to 39, price 8s.] 



UUHLIN : PRINTKII AT TUB UNITBKSITV yilBBS BY fONSUMHY AND OIHBS. 



