CONTENTS OF VOL. XXXI. SIXTH SERIES. Yll 



Page 



Mr. C. Scott Garrett on the Infra-red and Ultra-violet 



Absorption of Sulphur Dioxide and their Relation to the 



Infra-red Spectra of Oxygen and Hydrogen Sulphide .... 505 

 Prof. E. C. C. Baly and Mr. C. S. Garrett on the Ultra-violet 



Absorption System of Sulphur Dioxide 512 



Dr. John R. Airey: Bessel and JNeuinann Functions of Equal 



Order and Argument 520 



Prof. V. Karapetoff on Divergence and Curl in a Vector Field 



in terms of curvature and tortuosity 528 



Prof. H. Lamb on Wave-Patterns due to a Travelling 



Disturbance 539 



Dr. Horace Lester on the Variation of Thermionic Currents 



with Potentials 549 



Prof. I. J. Schwatt on the Partial Fraction Problem 560 



Proceedings of the Geological Society : — 



Mr. H. Dewey on the Origin of some River-Gorges in 

 Cornwall and Devon 571 



Index 573 



PLATES. 



I. Illustrative of Messrs. C. V. Raman and S. Appaswamaiyar's Paper 

 on Discontinuous Wave-Motion. 



II. Illustrative^ of Mr. E. J. Evans's Paper on the Absorption Spectra 

 of the Vapours of Inorganic Salts. 



