IV CONTENTS OF VOL. XXXV. FIFTH SERIES. 



NUMBER CCXIIL— FEBRUARY. 



Page 



Dr. "W. E. Sumpner on the Diffusion of Light . . . . 81 



Dr. G. Gore on the Relation of Yolta Electromotive Eorce to 



Pressure &c 97 



B. Galitzine on Radiant Energy 113 



Mr. S. U. Pickering on the Diffusion of Substances in 



Solution 127 



Prof. J. G. MacGregor on Contact-Action and the Conserva- 

 tion of Energy , 134 



Mr. A. A. Campbell Swinton's Experiments with High 



Frequency Electric Discharges , 142 



Notices respecting New Books : — 



Mr. J. F. Blake's Annals of British Geology, 1891 .... 145 

 Proceedings of the Geological Society : — 



Prof. E. Hull's Outline of the Geological Features of 



Arabia Petrsea and Palestine 146 



Rev. A. Irving on the Base of the Keuper Formation in 



Devon 147 



Mr. J. H. Cooke on the Marls and Clays of the Maltese 



Islands 148 



Prof. T. G. Bonney on the Nufenen-Stock (Lepontine 



Alps) 148 



Prof. T. G. Bonney on some Schistose " Greenstones " 

 and allied Hornblendic Schists from the Pennine Alps, 

 as illustrative of the Effects of Pressure-Metamor- 



phism 149 



Prof. T. G. Bonney on a Secondary Development of 

 Biotite and of Hornblende in Crystalline Schists from 



the Binnenthal 150 



Mr. J. H. Collin s's Geological Notes on the Bridgewater 



District in Eastern Ontario : 150 



Visible Representation of the Equipotential Lines in Plates 

 traversed by Currents ; explanation of Hall's Phenomenon, 



by E. Lommel 151 



On the Action of Light upon Electrical Discharges in various 



Gases, by F. Breissig 151 



Notice of a Meteoric Stone seen to fall at Bath, South Dakota, 

 by A. E. Foote 152 



NUMBER CCXIV.— MARCH. 



Prof. Ludwig Boltzmann on the Equilibrium of Vis Viva. — 

 Part III 153 



Mr. Carl Barus on the Fusion Constants of Igneous Rock. — 

 Part II. The Contraction of Molten Igneous Rock on Passing 

 from Liquid to Solid. (Plate V.) 173 



Dr. J. R. Rydberg on a certain Asymmetry in Prof. Rowland's 

 Concave Gratings 190 



