CONTENTS OF VOL. XLIX. FOURTH SERIES. VH 



Page 

 Mr. E. Moon's Eemarks on Helmholtz's Memoir on the Con- 

 servation of Force 377 



Messrs. G. C. Foster and O. J. Lodge on the Flow of Electri- 

 city in a uniform plane conducting Surface. — Part I. (With 



a Plate.) 385 



Notices respecting New Books : — 



Prof. AV. S. Jevons's Principles of Science: a Treatise on 



Logic and Scientific Method 400 



Prof. A. F. Weinhold's Introduction to Experimental Phy- 

 sics, Theoretical and Practical, including directions for 

 constructing Physical Apparatus and for making expe- 

 riments 404 



Proceedings of the Geological Society : — 



Mr. J. Prestwich on the Phenomena of the Quaternary 



Period in the Isle of Portland and around Weymouth. 408 

 Prof. N. S. Maskelyne and Dr. Flight on the Character 



of the Diamantiferous Rock of South Africa 409 



On the Spectrum of the Aurora, by W. Marshall Watts 410 



Experiments with the Holtz Machine, by F. Eossetti 411 



On the solution of Hydrogen in Metals, and the decomposition 



of Water by Iron, by MM. L. Troost and P. Hautefeuille. 413 

 On a Lecture-room Apparatus for the determination of the 

 Mechanical Equivalent of Heat, by H. J. Puluj, Assistant 

 in the Imperial Marine Academy, Fiume 416 



NIJMBEE CCCXXVIL— JUNE. 



MM. F. Kohlrausch and O. Grotrian on the Electric Conduct- 

 ing-power of the Chlorides of the Alkalies, Alkaline Earths, 

 and Nitric Acid in Aqueous Solutions 417 



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

 certain Metallic Chlorides , 425 



Prof. A. M. Mayer's Eesearches in Acoustics. — No. VII 428 



Mr. C. Tomlinson on some Phenomena connected with the 

 Boiling of Liquids 432 



Prof. Wiillner on M. Goldstein's Observations on Spectra of 

 Gases 448 



Messrs. G. C. Foster and O. J. Lodge on the Flow of Electri- 

 city in a uniform plane conducting Surface. — Part I. (With 

 a Plate.) 453 



Mr. W. Spottiswoode on a new Eevolving Polariscope 472 



Proceedings of the Eoyal Society : — 



Mr. J. A. Broun on the Sun-spot Period and the Eainfall. 474 



Proceedings of the Geological Society : — 



Dr. J. Young and Mr. J. Young on new Carboniferous 

 Polyzoa ; and on Palceocoryne and other Polyzoal A ppen- 

 daa;es 478 



