﻿CONTENTS OF VOL. XII. SIXTH SERIES. V 



Page 



Prof. W. J. Sollas on Recumbent Folds produced as a 

 Result of Flow 175 



Dr. H. Pjetursson on the Grag of Iceland — an Inter- 

 calation in the Basalt-Formation 176 



NUMBER L XIX.— SEPTEMBER. 



Dr. M. Levin on the Origin of the f3 Rays emitted by 

 Thorium and Actinium 177 



Mr. A. 8. Eve on the Radioactive Matter in the Earth and 

 the Atmosphere 189 



Messrs. W. Hawthorne and W. B. Mortou on the Deflexions 

 caused by a Break in an Overhead Wire carried on Poles . 200 



Mr. A. Russell on the Dead Points of a Galvanometer 

 Needle for Transient Currents 202 



Mr. J. A. Brown : An Investigation of the Potential re- 

 quired to maintain a Current between Parallel Plates in a 

 Gas at Low Pressures 210 



Dr. J. Morrow on the Lateral Vibration of Bars subjected to 

 Forces in the Direction of their Axes 233 



Dr. O. Hahn on the Ionization Ranges of the n Rays of 

 Actinium 244 



Dr. J. A. Ewing on the Molecular Structure of Metals .... 254 



Prof. L. T. More on the Dielectric Strain along the Lines of 

 Force 268 



Prof. H. A. Wilson on the Theory of "Moving Coil" and 

 other kinds of Ballistic Galvanometers 269 



NUMBER LXX.— OCTOBER. 



Mr. R. D. Kleeman on the Recombination of Ions made by 

 a, /3, y, and X Rays 273 



Dr. S. R. Milner on the Use of the Secohm meter for the 

 Measurement of Combined Resistances and Capacities. . . . 297 



Dr. P. E. Shaw on the Disruptive Voltage of Thin Liquid 

 Films between Iridio-Platinum Electrodes. — Parti. Voltages 

 25-400 317 



Prof. R. W. Wood on the Fluorescence, Magnetic Rotation, 

 and Temperature Emission Spectra of Iodine Vapour. 

 (Plate IV.) 329 



Prof. F. T. Trouton and Mr. C. Searle on Leakage Currents 

 in the Moisture condensed on Glass Surfaces 336 



