SCIENTIFIC PROCEEDINGS— continued. 



21. Further Observations on the Cause of the Common Dry-Rot of the Potato 



Tuber in the British Isles. By George H. Pethybridge. b.sc, ph.d., and' 

 H. A. Lafferty. (Plates VI- VII.) (June, 1917.) Is. Gd. 



22. The Gymnosomatous Pteropoda of the Coasts of Ireland. By Anne L. Massy. 



(Plate VIII.) (July, 1917.) Is. 

 28. Spermolithus Devonicus, gen. et sp. nov., and other Pteridosperms from the 

 Upper Devonian Beds at Kiltorcan, Co. Kilkenny. By Thomas Johnson, 

 d.sc., f.l.s. (Plates IX-XIV.) (August, 1917.) Is. Gd. 



24. The Genus Taenitis, with some Notes on the remaining Taenitidinae. By 



Elizabeth J. Leonard, m.so. (Plate XV.) (February, 1918). Is. 



25. The Quantitative Spectra of Lithium, Rubidium, Caesium, and Gold. By 



A. G. G. Leonard, a.r,c.so.i., b.sc, ph.d., and P. Whelan, a.r.c.sc.i.. 

 (Plate XVI.) (February, 1918.) Gd. 



26. The Polarisation of a Leclanch6 Cell. By Felix E. Hackett, ph.d., and 



R. J. Feely, a.r.c.sc.i. (March, 1918.) 6d. 



27. The Electrical Resistance of Porcelain at Different Temperatures. By R. G. 



Allen, b.sc, lond. ; a.r.c.sc.i. (June, 1918.) Is. 



28. Observations on the Morphology of Larix leptolepis. By Joseph Doyle, 



b.a., m.sc (Plates XV1I-XVIII.) (August, 1918.) Is. 



29. The Insulating Properties of Erinoid. By R. G. Allen, b.sc (lond.), a.r.c.sc.i. 



(August, 1918.) Is. 



80. A Disease of Flax Seedlings caused by a species of Colletotrichum, and. trans- 



mitted by Infected Seed. By George H. Pethybridge, b.sc, ph.d., and 

 H. A. Lafferty, a.r.c.sc.i. (Plates XIX-XX.) (August, 1918.) Is. Gd. 



81. The Determination of the Rate of Solution of Atmospheric Nitrogen and 



Oxygen by Water. Part I. By W. E. Adeney, d.sc, a.r.c.sc.i., f.i.c, and 

 H. G. Becker, a.r.c.sc.i. (Plate XXI.) (August, 1918.) Is. 



32. The Absorption of Water by Vulcanized Fibre and Erinoid on Exposure to 

 Moist Air, and the consequent change of Electrical Resistance. By 

 R. G. Allen, b.sc (lond.), a.r.c.sc.i. (October, 1918.) Gd. 



83. The Twist and Magnetization of a Steel '.Cube in a Spiral Magnetic Field. 

 By F. E. Hackett, m.a., ph.d. (October, 1918). Gd. 



34. Mahogany, and the Recognition of some of the Different Kinds by their Micro- 

 scopic Characteristics. By Henry H. Dixon, sc.d., f.r.s. (Plates XXII- 

 XLIV.) (December, 1918.) 4s. Gd. 



85. A Disease of Tomato and other Plants caused by a New Species of Phytoph- 

 thora. By George H. Pethybridge, b.sc, ph.d., and H. A. Lafferty, 

 a.r.c.sc.i. (Plates XLV.-XLVII.) (February, 1919). Is. Gd. 



36. Exudation of Water by Colocasia Antiquorum. By Margaret G. Flood, b.a. 



(Plates XLVIII.-XLVIIIa.) (April, 1919.) Is. 



37. The Determination of the Volatile Fatty Acids by an Improved Distillation 



Method. By Joseph Reilly, m.a., d.sc, f.r.csc.i., and Wilfred J. 

 Hiokinbottom. (Plate XLIX.) (April, 1919.) Is. 

 88. Solar Halos seen at Greystones, Co. Wicklow, on September 22nd, 1879 ; and 

 in Texas and Ohio, U.S.A., on October 3rd, 1917. By Sir John Moore, 

 m.a., m.d., d.sc, f.r. MET. soc (Plate L.) (April, 1919.) Gd. 



39. Two New Species of Collembola from Nyassaland. By George H. Carpenter, 



d.sc, m.r.i.a. (Plate LI.) (April, 1910.) Gd. 



40. An Economic Method of Determining the Average Percentage of Fat in a. 



Cow's Milk for a Lactation Period. By E. J. Sheehy, f.r.csc.i. (Plates 

 LII.-LIII.) (May, 



41. The Comparative Variatj^ J^jt^Substances of Cows' Milk. By 

 E. J. Sheehy, f.r.c 



puintkd A-mlTe ™HWI ■pttonsonhy AND OMtBS. 



