CONTENTS OF VOL. II. FIFTH SERIES. Vll 



Page 

 Messrs. H. E. Eoscoe and T. E. Thorpe on the Absorption- 

 Spectra of Bromine and Iodine Monochloride 467 



Proceedings of the Geological Society : — 



Mr. S. Allport on the Metamorphic Rocks surrounding 



the Land's-End mass of Granite 469 



Mr. C. D. Davies on the relation of the Upper Carboni- 

 ferous strata of Shropshire and Denbighshire to beds 



usually described as Permian 470 



Mr. A. W. Howitt on the Physical Geography and Geo- 

 logy of North Gippsland, Victoria 470 



Mr. E. J. Dunn on the Diamond-Fields of South Africa 471 

 Mr. G. H. Kinahan on Chesil Beach, Dorsetshire, and 



Cahore Shingle Beach, co. Wexford 472 



The Rev. A. Irving on some recent Sections near Notting- 

 ham 472 



Mr. E. Wilson on the Permians of the North-east of 

 England and their Relations to the under- and overlying 



Eormations 473 



Mr. C. T. Clough on the Section at HighEorce, Teesdale. 473 

 Mr. J. R. Mortimer on the Distribution of Flint in the 



Chalk of Yorkshire 474 



Mr. D. Mackintosh on the Mode of Occurrence and Deri- 

 vation of Beds of Drifted Coal near Corwen, North 



Wales 474 



Mr. J. Buckman on the Cephalopoda-beds of Gloucester, 



Dorset, and Somerset 474 



Mr. R. A. Peacock on the Subsidence of the Island of 



Guernsey 475 



On the Rotatory Polarization of Quartz, by J. L. Soret and 



Ed. Sarasin 475 



On the Ratio of the two Specific Heats of a Gas, by Ch. Simon 478 

 A new Process for the Separation of Gallium, by Lecoq de 

 Boisbaudran 479 



NUMBER XIV.— SUPPLEMENT. 



Mr. R. Sabine on Electricity disengaged between Mercury 

 Surfaces, and on the Motions produced in Mercury by De- 

 oxidation 481 



Prof. A. M. Mayer's Researches in Acoustics 500 



Prof. E. Ketteler on a Theory of the (Anomalous) Dispersion 

 of Light in Singly and Doubly Refracting Media 508 



Mr. J. W. L. Glaisher on a Multiple Differentiation of a cer- 

 tain Expression 521 



Mr. O. J. Lodge on a Mechanical Illustration of Thermo- 

 electric Phenomena 524 



