Vlll CONTENTS OF VOL. IV. SIXTH SERIES. 



Page 

 JSToties respecting New Books : — 



Harper's Scientific Memoirs 724 



Prof. H. A. Lorentz's Sichtbare nnd Unsichtbare Beweg- 



ungen 725 



Electrochemical Industry 725 



Index 726 



PLATES. 



I. & II. Illustrative of Dr. J. II. Vincent's Paper on a General Numerical 

 Connexion between the Atomic Weights. 



III. Illustrative of Prof. J. Trowbridge's Paper on Spectra arising from 



the Dissociation of Water Vapour. 



IV. Illustrative of Dr. G. Johnstone Stoney's Paper on the Law of 



Atomic Weights. 



V. & VI. Illustrative of Dr. J. T. Bottomley's Paper on Radiation of 



Heat and Light from Heated Solid Bodies. 



