Vlll CONTENTS OF VOL. XXXI. — FOURTH SERIES. 



Page 

 M. G. Neumayer on Aqueous Vapour and Terrestrial Radiation. 510 

 Mr. W. Huggins and Dr. W. A. Miller on the Spectra of some 



of the Fixed Stars 515 



Mr. W. Huggins on the Spectra of some of the Nebulae 523 



Archdeacon Pratt on the Level of the Sea during the Glacial 



Epoch 532 



Prof. W. Thomson on the Observations and Calculations re- 

 quired to find the Tidal Retardation of the Earth's Rotation 533 

 Proceedings of the Royal Society : — 



Mr. J. Evans on a possible Geological Cause of Changes 



in the Position of the Axis of the Earth's Crust 53/ 



Proceedings of the Geological Society : — 



M. Fouque on the Eruptions at the Kaimeni Islands .... 545 

 Mr. A. Tylor on the Upper and Lower Valley-gravels of 



part of England and France 546 



Sir Philip de M. Grey Egerton on a new species of Acan- 



thodes from the Coal-sbales of Longton 546 



Mr. H. Seeley on the Gravels and Drift of the Fenland . . 547 

 Prof. Harkness and Mr. H. Nicholson on the Geology of 

 the Lake-country, and on the Lower Silurian Rocks of 



the Isle of Man 547 



On the Law of the Union of Simple Substances, and on Attrac- 

 tions at Small Distances, by MM. Athanase and P. Dupre. . 548 

 On a New Method of Measuring the Lengths of Luminous 



Waves, by Professor Stefan . . 550 



On the Influence of Internal Friction in the Air on the Motion 

 of Sound, by Professor Stefan 551 



Index 552 



PLATES. 



I. II. III. Illustrative of Sir David Brewster's Paper on the Bands formed 

 by the Superposition of Paragenic Spectra produced by the 

 Grooved Surfaces of Glass and Steel. 



IV. Illustrative of Prof. TyndalPs Paper on Calorescence. 



V. VI. Illustrative of Mr. W. Huggins and Dr. Miller's Paper on the 



Spectra of some of the Fixed Stars, and Mr. W. Huggins's on the 

 Spectra of some of the Nebulae. 



ERRATA. 



Vol. 30. Page 410, lines 30 and 31, transpose the words "common oxygen 

 and " ozone." 



-.4*1*1**. (gS)*-®' 



Vol. 31. — 305, line 2 from bottom, for simple proportion to the latitude 

 read simple proportion to the sine of the latitude. 



