684 



Index. 



I'liyluphthora, a New Species of, causing 

 Disease in the Tomato and other Plants 

 (Pethybridge and Lafferty), 487- 



Plants, Osmotic Pressures in (Dixon and 

 Atkins), 51. 



Polarisatiim of a I.eclanehe Cell (Hackett 

 and Feelt), 279. 



Porcelain, Electrical Resistance of, at Dif- 

 ferent Temperatures (Allen), -S9. 



Potato Tuber in the British Isles, Further 

 Observations on the Cause of the Com- 

 mon Dry-Rot in the (Pethybiudge and 

 Lafferty), 193. 



Potato, Vertieillium Disease of the (Pethy- 

 brtdge), 63. 



Preliminary Notes on the Carbohydrates of 

 the Musci (Mason), 13. 



Pteridosperms from the Upper Devonian 

 Beds of Kiltorcan, Co. Kilkenny (John- 

 son), 245. 



Pteropoda (G3'mnosornatous) of the Coasts 

 of Ireland (Massy), 223. 



QuantitativeSpeetraol Lithium, Rubidium, 

 Caesium, and Gold (Leonard and Wee- 

 LAN), 274. 



Rabbit, an Abnormality in the Arterial 

 System of the (Sheeh y), 159. 



Reilly (Joseph) and Edgar W. Ralph. 

 The System n-Butyl Alcohol-Acetone- 

 Water, 597. 



Reilly (Joseph) and Wilfred J. Hickin- 

 bottoji. The Determination of the 

 Volatile Fatty Acids by an Improved 

 Distillation Method, 513. 



Ryan (Hugh) and Thomas Hillon. On 

 the Hydrocarbons of Beeswax, 107. 



Ryan (Hugh) and Michael J. Walsh. 

 On Dcsoxy-Hydroeatechin-Tetramelliyl- 

 Ether, 113. 



Sap, Composition of the, in the Conducting 

 Tracts of Trees at Different Levels and 

 at Different Seasons of the Year (Dixon 

 and Atkins), 51. 



Sheehy (Edmond J.). An Abnormality in 

 the Arterial System of the Rabbit, 159. 



The Comparative Variation of the 



Constituent Substances of Cows' Milk, 

 574. 



Sheehy (Edmond J.), An Economic 

 Method of Determining the Average 

 Percentage of Fat in a Cow's Milk for a 

 Lactation Period, 546. 



Possible Causes of Variation in the 



Quantity and Quality of Cows' Milk, 

 585. 

 Solar Halos seen at Greystones, Co. Wick- 

 low, on September 22nd, 1879; and in 

 Texas nnd Ohio, U.S.A., on October 3rd, 

 1917 (Moore), 539. 

 Some Factors affecting the Concentration 

 of Electrolytes in the Leaf- sap of Syriiiga 

 vulgaris (Mason), 651. 

 Spectra (Quantitative) of Lithium, Rubi- 

 dium, Caesium, and Gold (I.konahii and 

 Whixan), 274. 

 S/iermoiithns Devoniens, gen. et sp. nov., 

 and other Pteridosperms from the Upper 

 Devonian Beds at Kiltorcan, Co. Kil- 

 kenny (Johnson), 215. 

 Steel Tube, The Twist and Magnetization 

 of a, in a Spiral Magnetic Field 

 (Hacketi), 415. 

 Subsidence of Torsional Oscillations and the 

 Fatigue of Iron Wires when subjected 

 to the Influence of Alternating Magnetic 

 Fields of Frequencies up to 250 per 

 Second (Urown), 1. 

 Subsidence of Toi'sional Oscillations of 

 Nickel and Iron Wires when subjected 

 to the Influence of Transverse Magnetic 

 Fields up to S00 C.G.S. Units (Brown), 

 125. 

 ■Subsidence of Torsional Oscillations of 

 Nickel Wires when subjected to the In- 

 fluence of Transverse Magnetic Fields 

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

 Syrinya vulgaris, On some Factors afl'eeting 

 the Concentration of Electrolytes in the 

 Leaf-sap of (Mason), 651. 

 System n- Butyl Alcohol-Acetone-Water 

 (Reilly and Ralph), 597. 



Taenitis, with some >'otes on the remaining 

 Taenitidiiiae (Leonard), 255. 



Tomato and other Plants, a Disease of, 

 caused by a New Species of PhylophLhoru 

 (Pethybridge and Laffeuty), 487. 



Trajectories in a Magnetic Field : Experi- 

 mental Lemma to Mitokinetism (Belas 

 and Hartog), 33. 



Twist and Magnetization of a steel Tube in 

 a Spiral Magnetic Field (Hac .kbit), 415. 



