CONTENTS OF VOL. XIX. SIXTH SERIES. V 



Page 



Mr. J. V. Elsden on the Geology of the Neighbourhood 

 of Seaford (Sussex) 333 



Messrs. C. T. Clough, H. B. Muff, and H. B. Bailey on 

 the Cauldron Subsidence of Glen Coe and the 

 Associated Igneous Pheuomena 334 



Mr. C. Carus- Wilson on the Pitting of Flint-Surfaces. . 336 



NUMBER CXI.— MAECH. 



Mr. C. A. Sadler on Homogeneous Corpuscular Kadiation. 



(Plate V.) 337 



Mr. S. D. Chalmers on the Sine Condition in Relation to 



the Coma of Optical Systems 356 



Mr. C. E. Van Ors trail d on Reversion of Power Series .... 366 

 Mr. J. L. Hogg on Friction in Gases at Low Pressures .... 376 

 Prof. W. M. Thornton on the Polarization of Dielectrics in a 



Steady Field of Force 390 



Mr. Koberfc E. Baynes : Saturation Specific Heat?, &c, with 



van der Waals's and Clausius's Characteristics. (Plate VI.). 407 

 Dr. C. V. Burton on the Sun's Motion with respect to the 



^Ether , 417 



Sir J. J. Thomson on Kays of Positive Electricity ....... 424 



Dr. J. W. Nicholson on the Bending of Electric Waves 



round the Earth 435 



Prof. Jean Perrin on the Charge of the Electron 438 



Prof. J. P. Kuenen on Pirani's Method of Measuring Self- 

 Inductance 439 



Notices respecting New Books : — 



The Scientific Papers of Sir William Huggfus 441 



J. Cavalier's Lecons sur les Alliages metalliques 444 



Q. Cramp and C. F. Smith's Vectors and Vector 



Diagrams applied to the Alternating Current Circuit. 445 

 J. L. Coolidge's Elements of Non-Euclidean Geometry.. 445 

 Dr. F. Kohlrausch's Lehrhuch der Practischen Physik. . 446 

 Proceedings of the Geological Society : — 



Dr. J. E. Marr and Mr. W. G. Fearnsides on the Howgill 



Fells and their Topography 447 



Dr. W. F. Hume on the Granite-Bidges of Kharga 



Oasis : Intrusive or Tectonic? 448 



Intelligence and Miscellaneous Articles: — 



Correction to Mr. E. Gold's Paper on "The Eelation 

 between Periodic Variations of Pressure, Temperature, 

 and "Wind in the Atmosphere." 448 



