IV CONTENTS OF VOL. IV. SIXTH SERIES. 



Page 

 Proceedings of the Geological Society : — 



Mr. P. F. Kendall on a System of Glacier-Lakes in the 



Cleveland Hills 174 



Mr. A. R. Dwerryhouse on the Glaciation of Teesdale, 

 Weardale, and the Tyne Vallev, and their Tributary 

 Valleys 176 



NUMBER XX.— AUGUST. 



Lord Kelvin on the Weights of Atoms 177 



Dr. Giuseppe Zettwnch : Researches on the Blue Colour of 



the Sky 199 



Mr. A. M. Herbert on the Effect of the Presence of Hydrogen 



on the Intensity of the Lines of the Carbon Spectrum .... 202 

 Mr. H. A. Wilson on the Laws of Electrolysis of Alkali 



Salt-Vapours 207 



Lord Rayleigh : Is Rotatory Polarization influenced by the 



Earth's Motion ? .' 215 



Prof. R. Straubel : Experiments on the Electro-thermal Effect 



in Tourmaline 220 



Mr. F. J. Jervis-Smith on a High Pressure Spark-Gap used 



in connexion with the Tesla Ceil • 221 



Mr. J. W. Peck on the Steady Temperatures of a Thin Rod . . 22G 

 Mr. T. H. Blakesley on a Method of mechanically obtaining 



d from the Hyperbolic Trigonometrical Functions of 6. . . . 238 

 Mr. G. J. Parks on the Heat Evolved or Absorbed when a 



Liquid is brought in Contact with a Finely Divided Solid . . 240 

 Prof. J. J. Thomson on some of the Consequences of the 



Emission of Negatively Electrified Corpuscles by Hot Bodies. 253 

 Prof. C. Barus on Spontaneous Nucleation, and on Nuclei 



produced by Skaking Solutions 202 



Dr. Meyer Wilderman on the Velocity of Reaction before 

 Complete Equilibrium and the Point of Transition are 



reached, &c— Part II 270 



Notices respecting New Books : — 



Sir George G. Stokes's Mathematical and Physical Papers, 



Vol. hi 277 



Prof. H. Geitel's Ueber die Anwendung der Lehre von 

 den Gasionen auf die Erscheinungen der atmosphar- 



ischen Elektricitat 278 



J. M. Pernter's Meteorologische Optik 278 



P. Barbarin's La Geometrie Non Euclidienne 278 



W. R. Cooper's Primary Batteries, their Theory, Con- 

 struction, and Use 278 



E. Lemoine's Geometrographie ou Art des Constructions 



Ge'ometriques 2^ {) 



H, Andoyer's The'orie de la Lune 280 



