Contents. 
Vll 
PAGE 
On the Recovery of foliage Leaves from surgical Injuries. By F. F. 
Blackman and Miss G. L. C. Matthaei 222 
Liquid Motion from a Single Source inside a Hollow Unlimited Boun- 
dary. By H. J. Sharpe 223 
Liveingite , a new mineral from the Binnenthal. By K. H. Solly, with 
analysis by H. Jackson 239 
Proceedings at the Meetings held during the Session 1900 — 1901 . . 241 
On the Hall Effect in Gases at Low Pressures. By H. A. Wilson . . 249 
On some Phenomena connected with the Combination of Hydrogen and 
Chlorine under the influence of Light. By P. Y. Bevan . . . 264 
Notes on the Development of Sagitta. By L. Doncaster . . . 267 
On the Unit of Classification for Systematic Biology. By H. M. Bernard 268 
Notes on the Binney Collection of Coal-Measure Plants. Part III. The 
Type-Specimens of Lyginodendron Oldhamium (Binney). By E. A. 
Newell Arber 281 
On the Negative Radiation from hot Platinum. By 0. W. Richardson 286 
On the Action of Incandescent Metals in producing Electric Conductivity 
in Gases. By J. A. McClelland 296 
On the Question of “ Predisposition ” and “ Immunity ” in Plants. By 
Prof. H. Marshall Ward 307 
On the Genito-urinary Organs of Dipnoan Fishes. By J. Graham Kerr 329 
Further Observations upon the Biological Test for Blood. By Dr G. H. 
F. Nuttall 334 
Note on a Method for determining the Concentration of Hydrogen Ions in 
Solution. By H. O. Jones and 0. W. Richardson . . . 337 
On the oxidation of Glucosone to Trioxybutyric Add. By R. S. Morrell 340 
On the formation of Di-nitro-phenoxazines. By J. C. Crocker . . 342 
On the interaction of Thiocyanates , Picric Chloride , and Alcohols. By 
J. C. Crocker 347 
Note on the Reduction of a Ternary Quantic to a Symmetrical Deter- 
minant. By Dr A. C. Dixon 350 
On the Zeros of a Polynomial. By J. H. Grace 352 
On Oxidation in Presence of Iron. By H. J. H. Fenton . . . 358 
On a method of increasing the sensitiveness of Michelson's Interferometer. 
By H. C. Pocklington 375 
On the Influence on Light reflected from and transmitted through a Metal 
of a Current in the Metal. By P. Y. Bevan 380 
On the Hall Effect in Gases at Low Pressures. By H. A. Wilson . .391 
On the Coeffdent of Mutual Induction for a drcle and a drcuit with two 
parallel sides of infinite length. By G. F. C. Searle . . . 398 
Notes on Semper' s Larvae (With Plate IY.). By K. Ramunni Menon . 407 
On a Definite Integral. By T. J. FA. Bromwich 419 
On the Unit of Classification for Systematic Biology. By J. Stanley 
Gardiner 423 
