IV CONTENTS OF VOL. XXIV. FIFTH SERIES. 



Page 

 Mr. W. E. Stanley on the Probable Amount of former 



Glaciation of Norway 139 



Prof. T. G. Bonney on the Structures and Eelations of 



some of the older Rocks of Brittany 139 



Rev. E. Hill on the Rocks of Sark, Herm, and Jethou. . 141 

 Mr. J. Radcliffe on Quartzite Boulders and Grooves in 



the Roger Mine at Dukinfield 141 



The Adams Prize, Cambridge University 142 



On Atmospheric Electricity, by R. Nahrwold 143 



On an Experimental Determination of the Work of Magnetiza- 

 tion, by A. Wassmuth and G. A. Schilling 144 



NUMBER CXLYII.— AUGUST. 



Lord Rayleigh on the Maintenance of Vibrations by Eorces of 

 Double Frequency, and on the Propagation of Waves 

 through a Medium endowed with a Periodic Structure .... 145 

 Mr. R. H. M. Bosanquet on the Production of Sudden 

 Changes in the Torsion of a Wire by Change of Tempera- 

 ture. (Plates VI. & VII.) 160 



Mr. C. V. Burton on the Value of " r " for a Perfect Gas . . 166 



Mr. W. Sutherland on the Law of Molecular Eorce 168 



Sir W. Thomson on the Stability of Eluid Motion. — Recti- 

 lineal Motion of Viscous Eluid between two Parallel Planes 188 

 Drs. W. Ramsay and S. Young on Evaporation and Dissocia- 

 tion. — Part VI. On the Continuous Change from the 

 Gaseous to the Liquid State at all Temperatures. (Plates 



Hl.-V.) 196 



Mr. T. M. Reade on the Secular Cooling of the Earth in re- 

 lation to Mountain-Building 212 



Mr. C. V. Boys on an Addition to Bunsen's Ice-Calorimeter. . 214 

 Proceedings of the Geological Society : — 



Mr. E. Rutley on the Rocks of "the Malvern Hills 217 



Dr. C. Callaway on the alleged Conversion of Crystalline 



Schists into Igueous Rocks in County Galway 218 



Dr. C. Callaway's Preliminary Inquiry into the Genesis 



of the Crystalline Schists of the Malvern Hills 219 



Mr. H. G. Lvons on the Loudon Clay and Bagshot Beds 



of Aldershbt , 220 



Mr. W. H. Hudleston's Supplementary Note on the 



Walton Common Section 221 



A New Method of Reducing Observations relating to several 



Quantities, by E. Y. Edgeworth 222 



A New Photographic Spectroscope, by C. C. Hutchins 223 



On the Electrification of Gases bv Ignited Bodies, bv ,T. Elster 

 and H. Geitel ' 224 



