iv Contents. 



No. PAGE. 



XI. — The Influence of Electrolytic Dissociation on the Distillation 

 in Steam of the Volatile Fatty Acids. By Joseph Eeilly, 

 M.A., D.sc, iMi.o.so.i., and Wilfred J. Hiokinbottom, b.so. 

 (October, 1920.) . . . . . .120 



XII. — Notes on some Applications of the Method of Distillation in 

 Steam. By Joseph .Eeilly, m.a., d.sc, f.e.o.so.i., and 

 Wilfred J. Hiokinbottom, b.so. (October, 1920.) . . 131 



XIII. — The Determination of the Bate of Solution of Atmospheric 

 Nitrogen and Oxygen by Water. By W. E. Adeney, d.sc, 

 A.R.o.so.i., F.I.C., and H. G. Becker, a.e.cso.i., a.i.c. 

 (September, 1920.) . . . . . .143 



XIV. — A Determination, by means of a Differential Calorimeter, 

 of the Heat produced during the Inversion of Sucrose. 

 By Henry H. Dixon, scd., f.k.s., and Nigel G. Ball, b.a. 

 (December, 1920.) . . . . . .153 



XV. — The Measurement of very Short Time Intervals by the Con- 

 denser-Charging Method. By John J. Dowling, m.a., 

 F.INST. p., and Donal Donnelly, m.sc. (In conjunction with 

 the late Prof. J. A. McClelland, f.r.s.) (February, 1921.) 165 



XVI. — A Vibrating-Flame Eectifier for High-Tension Currents. By 

 John J. Dowling, m.a., f.inst.p., and J. T. Harris, b.so. 

 (February, 1921.) . . . . . .171 



XVII. — A Sensitive Valve Method for the Measurement of Capacity, 

 with some Important Applications. By John J. Dowling, 

 M.A., f.inst.p. (February, 1921.) .... 175 



XVIII. — A Direct Beading Ultra-Micrometer. By John J. Dowling, 



M.A., M.R.I. A., F.INST.P. (March, 1921.) . . . 185 



XIX. — Studies in the Physiography and Glacial Geology of Southern 

 Patagonia. By E. G. Fenton. (Plates V, VI, and VII.) 

 (March, 1921.) . . . . . .189 



XX. — Award of the Boyle Medal to George H. Pethybridge, b.so., 



PH.D., 1921. (March, 1921). . . . .226 



XXI. — 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. Hiokinbottom, m.sc, a.i.c. (August, 1921.) . 233 

 XXII. — The "Browning" and "Stem-Break" Disease of Cultivated 

 Flax (Linum usitatissimimi), caused by Polyspora lini n. gen. 

 at sp. By H. A. Lafferty, a.r.c.sci. (Plates VIII-X.) 

 (August, 1921.) . . . , . .248 



