SCIENTIFIC PROCEEDINGS— core^mwe^i 



21. The Concentration and Purification of Alcoholic Fermentation Liquors. 



Part I. — -The Distillation in Steam of certain Alcohols. By Joseph Eeilly, 

 M.A., D.sc, M.R.I. A., F.I.C., and Wilfred J. Hickinbottom, m.sc, a.i.c. 

 (August, 1921.) 



22. The "Browning" and "Stem-Break" Disease of Cultivated Flax (Linum 



usitatissinmm), caused by Polyspora lini n. gen. et sp. By H. A. LAFFERiy, 

 A.R.c.sc.i., Assistant in the Seeds and Plant Disease Division, Department 

 of Agriculture and Technical Instruction for Ireland. [Communicated by 

 Dr. George H. Pethybridge, b.sc] (Plates VIII-X.) (August, 1921.) 



23i A New Principle in Blowpipe Construction. By H. G. Becker, 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.r.s., and J. J. M'Henry, 

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

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



25. Biological Studies of Aphis 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, Rothamgted 

 Experimental Station, Harpenden, Plerts. [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. Gilmore, b.sc (Plates XI, XII.) (August, 1921.) 



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



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

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

 A.R.c.sc.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, f.l.s., 



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

 Gilmore, b.sc. (Plates XIII, XIV.) (August, 1921.) 



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



Phytophthora infestans. By Paul A. Murphy, b.a., a.r.o.sci.. Assistant 

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

 Technical Instruction for Ireland. (August, 1921.) 

 [Nos. 25 to 29, price Qs. 6d.] 



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., scd., f.i.c. 

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



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

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

 (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, sc.d., 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.r.o.sci., Assistant in the Seeds and Plant 

 Disease Division, Department of Agriculture and Technical Instruction for 

 Ireland. (February, 1922.) 



[Nos. 30 to 34, price 7s.'} 



UUHLIN ; PRINTRI) AT THE UNIVRHfilTY PHRM8 BY hONSONHY AND OIHBS. 



