﻿IV CONTENTS OF VOL. XXXVIII. FIFTH SERIES. 



in reference to the Surface of the Kathode, by Dr. J. Elster 



and H. Geitel ; 158 



On Vortex Motions in Air, by Prof. G. Quincke 159 



On a new Apparatus for the Production of High Pressure, by 

 Prof. S. W. Stratton 160 



NUMBEE CCXXXL— AUGUST, 



Mr. C. Chree on the Physical Consequences of the Local 

 Alteration of the Material of Isotropic Spheres or Spherical 



Shells under Uniform Surface-Pressure 161 



Prof. John Trowbridge on Electrical Eesonance and Electrical 



Interference. (Plate VII.) 182 



Mr. "William Sutherland on the Attraction of Unlike Mole- 

 cules. — II. The Surf ace-Tension of Mixed Liquids 188 



Mr. G. H. Bryan on Electromagnetic Induction in Plane, 

 Cylindrical, and Spherical Current-Sheets, and its Eepre- 



sentation by Moving Trails of Images 198 



Prof. William Ramsay on the Passage of Hydrogen through a 

 Palladium Septum, and the Pressure which it produces . . 206 



Prof. Eudski on the Eigidity of the Earth 218 



Lord Kelvin and Mr. Magnus Maclean on the Electrification 



of Air , 225 



Professors Li vein g and Dewar: Preliminary Note on the 

 Spectrum of the Electric Discharge in Liquid Oxygen, Air, 



and Nitrogen 235 



Proceedings of the Geological Society : — 



Mr. C. J. Alford on Auriferous Eocks from Mashonaland 240 

 Prof. T. G. Bonney on some Cases of the Conversion of 



Compact Greenstones into Schists 240 



Dr. J. "W. Gregory on the Waldensian Gneisses and 



their Place in the Cottonian Sequence . 241 



Sir Archibald Geikie on the Eelations of the Basic and 

 Acid Eocks of the Tertiary Volcanic Series of the 



Inner Hebrides 242 



Mr. Beeby Thompson on Landscape Marble 243 



Mr. Frank Eutley on the Origin of certain Novaculites 



and Quarfczites 244 



Mr. W. W. Watts on the Occurrence of Perlitic Cracks 



in Quartz 245 



On the Thermal Behaviour of Liquids, by Prof. Battelli .... 245 

 On the Formation of Floating Metal Laurinse, by F. Mvlius 

 and O. Fromm '. . .• 248 



