Index. 



683 



Iron Wires, Subsidence of Torsional Oscil- 

 lations and the Fatigue of, when sub- 

 jected to the Influence of Alternating 

 Magnetic Fields of Frequencies up to 

 250 per Second (Brown), 1. 



Johnson (Thomas) . Spertnolithns Devorii- 

 cus, gen. et sp. nov., and other Pterido- 

 sperms from the Upper Devonian Beds 

 at Kiltoroan, Co. Kilkenny, 245. 



Laminated Magnets, Note on (Brown), 

 137. 



Lun'x lejituhpis, Observations on the Mor- 

 phology of (Dosrr.E), 310. 



Leaf-sap of Syringa vulgaris, On some 

 Factors affecting the Concentration of 

 Electrolytes in the (Mason), 651. 



Leclanche Cell, The Polarisation of a 

 (Hacketi and Fkely), 279. 



Leonard (A. G. G.) and P. Whelau. The 

 Quantitative Spectra of Lithium, Rubi- 

 dium, Caesium, and Gold, 274. 



Leonard (Elizabeth J.). The Genus 

 'Taenilis, with some Notes on the re- 

 maining Taeiiitidinae, 255. 



Letts (E. A.) and Florence W. Rea. The 

 Chemistry of Foul Mud Deposits, 171. 



Magnets, Note on Laminated (Bkown), 

 137. 



Mahogany, and the Recognition of some of 

 the Different Kinds by their Microscopic 

 Characteristics (Dixon), 431. 



Mason (Thomas G.). On some Factors 

 ali'ecting the Concentration of Electro- 

 lytes in the Leaf-sap of Syringa vulgaris, 

 651. 



Preliminary Notes on the Carbohy- 

 drates of the Musci, 13. 



Massy (Anne !..). The Gymnosomatous 

 Pteropoda of the Coasts of Ireland, 223. 



Mode of Occurrence and Origin of the 

 Orbicular Granite of Mullaghderg, Co. 

 Donegal (Cole), 141. 



Moore (Sir John). Solar Halos seen at 

 Greystones, Co. Wicklow, on September 

 22nd, 1879; and in Texas and Ohio, 

 U.S.A., on October 3rd, 1917, 539. 



Mud Deposits, The Chemistry of Foul 

 (Letts and Rea), 171. 



Musci, Preliminary Notes on the Carbohy- 

 drates of the (Mason), 13. 



New Form of very High Resistance for use 

 with Electrometers (Dowling), 29. 



Nickel and Iron Wires, Fatigue of, when 

 subjected to the Influence of Transverse 

 Alternating Magnetic Fields (Bkown), 

 163. 



Nickel and Iron Wires, Subsidence of Tor- 

 sional Oscillations of, when subjected to 

 the Influence of Transverse Magnetic 

 Fields up to 800 C.G.S. Units (Bkown), 

 125. 



Nickel Wires, Change of Length in, due to 

 Transverse Magnetic Fields Direct and 

 Alternating (Beown), 121. 



Nickel Wires of Different Rigidities, 

 Change of Length in, due to Alternating- 

 Magnetic Fields of Frequencies up to 

 150 per Second (Bkown), 41. 



Nickel Wires, Subsidence of Torsional 

 Oscillations of, when subjected to the 

 Influence of Transverse Magnetic Fiehls 

 up to 200 C.G.S. Units (Brown), 99. 



Nitrogen and Oxygen, Determination of 

 the Rate of Solution of Atmospheric, by 

 Water. Parts I and II (A.DENUY and 

 Becker), 385, 609. 



Observations on the Morphology of Lurix 



le/jlolepis (Don.*:), 310. 

 Orbicular Granite of Mullaghderg, Co. 



Donegal, on the Mode of Occurrence of 



(Cole), 141. 

 Osmotic Pressures in Plants. VI — On the 



Composition of the Sap in the Conducting 



Tracts of Trees at Different Levels and 



at Different Seasons of the Tear (Dixon 



and Atkins), 51. 



Path of a small Permeable Body moving 

 with Negligible Acceleration in a Bipolar 

 Field (Belas and Hartog), 33. 



Pethybridge (G. H.). The Verticillium 

 Disease of the Potato, 63. 



Pethybridge (G. H.) and H. A. Lafferty. 

 A Disease of Flax Seedlings caused by a 

 species of Golletolrickum, and transmitted 

 by Infected Seed, 359. 



A Disease of Tomato and other 



Plants caused by a New Species of l'hy- 

 lophthora, 487. 



Further Observations on the Cause 



of the Common Dry-Rot of the Potato 

 Tuber in the British Isles, 193. 



