CONTENTS OF VOL. XXXVIII. SIXTH SERIES. V 



Page 



Prof. Barton and Miss Browning : A Syntonic Hypothesis of 

 Colour Vision with Mechanical Illustrations. (Plate VI.) 338 



Dr. Harold Jeffreys on the Derivation of the Lorentz-Einstein 

 Transformation 349 



Dr. B. van derPol, Jun., on a Method of Measuring without 

 Electrodes the Conductivity at various points along a Glow 

 Discharge and in Flames = 352 



Dr. B. van der Pol, Jun., on the Propagation of Electro- 

 magnetic Waves round the Earth 365 



Dr. G. W. Todd on a Simple Theory of the Knudsen Vacuum 

 Gauge 381 



Dr. L. Silberstein on a Time-Scale independent of Space 

 Measurement. Parabolic and Hyperbolic Kinematics. .. . 382 



Mr. A. B. Eason on Critical Speeds of Machiuery placed on 

 Upper Eloors of Buildings, as related to Vibration 395 



Dr. 11. A. Houstoun : A Theory of Colour Vision 402 



Prof. G. N. Antonoff on Surface Tension and Chemical 

 Interaction ............... «. 417 



The late Lord Kayleigh on the Travelling Cyclone ....... . . 420 



Proceedings of the Geological Society : — 



Dr. C. Taylor Trechmann on a Bed of Interglacial 

 Loess and some Pre-Glacial Freshwater Clays on the 

 Durham Coast 425 



Lord Rayleigh 427 



NUMBER CCXXVL— OCTOBER. 



Lt.-Col. A. B. Richardson on Stream-line Plow from a 



Disturbed Area 433 



Capt. J. Hollingworth on a JN"ew Form of Catenary 452 



Dr. T. R. Merton on an Experiment relating to Atomic 



Orientation 463 



Mr. N . R. Sen on the Potentials of Uniform and Heterogeneous 



Elliptic Cylinders at an External Point 465 



Mr. A. Everett on Proofs of Elementary Theorems of Oblique 



Refraction 480 



Prof. F. Soddy on the Relation between Uranium and Radium. 



—Part VII 4S3 



Dr. D. M. T. Sommerville on the " Slip-Curves " of an Amsler 



Planimeter 4S9 



Major W. T. David on the Origin of Radiation in a Gaseous 



Explosion 492 



