CONTENTS OF VOL. XIL 



(FIFTH SEEIES). 



NUMBEE LXXIL— JULY 1881. 



Pago 

 Messrs. Thorpe and Sucker on Dr. Mills's Eesearches on 



Thermometry , 1 



Prof. S. P. Thompson on the Conservation of Electricity, and 



the Absolute Scale of Electric Potential 13 



Mr. L. Fletcher's Crystallographic Notes 26 



Dr. E. J. Mills on the Ascent of Hollow Glass Bulbs in Liquids 27 

 Prof. J. H. Poynting on Change of State: Solid-Liquid. 



(Plate I.) 32 



Mr. J. J. Thomson on some Electromagnetic Experiments with 



Open Circuits 49 



Notices respecting New Books : — 



Mr. J. Venn's Symbolic Logic 61 



Prof. W. H. S. Monck's An Introduction to Logic .... 64 

 Sev. Dr. S. Haughton's Six Lectures on Physical Geo- 

 graphy 65 



Mr. J. W. Palliser's Practical Plane Geometry 67 



Dr. E. Atkinson's Natural Philosophy, for general readers 



aud young persons 68 



Mr. H. Bauerman's Textbook of Systematic Mineralogy 68 

 Proceedings of the Geological Society: — 



Mr. E. Eutley on the Microscopic Characters of the 



Vitreous Socks of Montana, U. S 69 



Mr. E. Rutley on the Microscopic Structure of Devttrified 



Socks from Beddgelert, Snowdon, and Skomer Island 70 

 Mr. T. M. Seade on the Date of the last Change of Level 



in Lancashire 70 



Mr. D. Mackintosh on the precise Mode of Accumulation 

 and Derivation of the Moel-Tryfan Shelly Deposits ; 

 on the Discovery of similar high-level Deposits along 

 the Eastern Slopes of the Welsh Mountains ; and on 

 the Existence of Drift-zones showing probable Varia- 

 tions in the Sate of Submergence 71 



Sev. J. E. Blake on the Correlation of the Upper Jurassic 



Socks of England with those of the Continent 72 



Prof. T. McKenny Hughes on the Basement-beds of 



the Cambrian in Anglesey 74 



Mr. J. S. Gardner's Description and Correlation of the 

 Bournemouth Beds 7o 



