CONTENTS OF VOL. L. FOURTH SERIES. 



NUMBER CCCXXXL— OCTOBEE. 



Page 

 Mr. H. A. Rowland's Studies on Magnetic Distribution .... 257 

 Sir G. B. Airy on a controverted Point in Laplace's Theory of 



the Tides 277 



Sir W. Thomson on the " Oscillations of the First Species " in 



Laplace's Theory of the Tides 279 



Prof. J. H. Gladstone and Mr. A. Tribe on the Augmentation of 

 the Chemical Activity of Aluminium by Contact with a more 



negative Metal 284 



Professor Gladstone and Mr. A. Tribe on the Action of the 



Copper-Zinc Couple 285 



Mr. J. Croll on the Wind Theory of Oceanic Circulation. — Ob- 

 jections examined 286 



Frederick Guthrie on Stationary Liquid Waves 290 



The Rev. O. Eisher on Mr. Mallet's Theory of Volcanic Energy 302 

 Notices respecting New Books : — 



Dr. H. L. E. Helmholtz on the Sensations of Tones as 



a Physiological Basis for the Theory of Music 319 



Mr. J. Croll on Climate and Time in their Geological Re- 

 lations : a Theory of Secular Changes of the Earth's 



Climate 322 



Proceedings of the Geological Society: — 



Mr. J. G. Goodchild on the Glacial Phenomena of the 

 Eden Valley and the Western Part of the Yorkshire- 

 Dale District 325 



Dr. E. Stoliczka's Geological Observations made on a 



visit to the Chaderkul, Thian-Shan range 325 



Mr. C. Gould on a recent Discovery of Tin-ore in Tas- 

 mania 326 



Mr. L. C. Miall on the occurrence of a Labyrinth odont 



in the Toredale Rocks of Wensleydale 326 



Dr. E. Stoliczka's Geological Notes on the Route traversed 



by the Tarkund Embassy 326 



Mr. J. D. Kendall on the Hematite Deposits of White- 

 haven and Eurness 327 



Mr. J. Milue on the Physical Characters and Mineralogy 

 of Newfoundland ; and on the Sinaitic Peninsula and 



North-western Arabia 327 



MM. W. C. Brogger and H. H. Reusch on Giant's Kettles 



at Christiania 327 



Mr. J. C. Ward on the Comparative Microscopic Rock- 

 structure of some Ancient and Modern Volcanic Rocks 327 

 Prof. Owen on fossil Evidences of a Sirenian Mammal . . 330 

 The Rev. J. E. Cross on the Geology of North-west Lin- 

 colnshire 331 



On the Cold Bands of Dark Spectra, by MM. P. Desains and 

 Avmonet 331 



