CONTENTS. 



PAGE 



Miss D. F. M. Pertz and Mr Francis Darwin, Experiments on the 



Periodic Movement of Plants 259 



Mr A. C. Seward, On the Wealden Plants from Bernissart . . . 259 

 Mr R. H. Biffen, On the Biology of Bulgaria polymorphs, . . . 260 

 Mr S. Skinner, On the Electro- chemical Equivalent of Carbon . . 261 

 Mr Alfred Harker, On the Magnetic Disturbances in the Isle of Sky e 



(with Plates XI, XII) . . . . . . . .... 268 



Mr A. C. Dixon, On Differential Equations with two Independent 



Variables . 278 



Mr G. E. H. Barrett-Hamilton, A suggestion as to a possible mode of 

 Origin of some of the Secondary Sexual Characters in Animals 

 as afforded by Observations on certain Salmon-ids . . . .279 



Mr W. L. H. Duckworth and Mr B. H. Pain, An Account of some 



Eskimo from Labrador 286 



Mr W. L. H. Duckworth and Mr D. H. Fraser, A Description of 



some dental Rudiments in human crania . . . . . 292 



Mr J. Graham Kerr, On the Zoological Position of Palaeospondylus, 



Traquair • 298 



Mr F. Gowland Hopkins, On the Separation of a pure Albumen from 



Egg-tvhite - 300 



Mr Herbert Richmond, On the simplest algebraic minimal curves, 



and the derived real minimal surfaces . . . . . .301 



Mr G. B. Mathews, Diophantine Inequalities . . . . . 302 



Mr R. S. Willows, On the distance between the striae in the positive 

 column and other phenomena connected with the discharge (with 

 Plate XIII). . . 302 



-Professor Ewing, The teaching of Mechanics by experiment . . . 317 



Mr W. F. Sheppard, On the calculation of the double integral ex- 

 pressing normal correlation .317 



Mr G. F. C. Searle, Apparatus for Measuring the Extension of a 



Wire . . . • 318 



