CONTENTS OF VOL. XII. FIFTH SERIES. V 



Page 



Messrs. Ayrton and Perry on the Index of Eefraction of Ebo- 

 nite 196 



Mr. T. Gray on Instruments for Measuring and Recording 

 Earthquake-Motions. (Plate III.) 199 



Dr. J. Moser on the Microphonic Action of Selenium Cells . . 212 



Prof. G. Wiedemann on Prof. Hughes's Papers on Molecular 

 Magnetism 223 



Mr. C. E. A. "Wright on the Number of Electrostatic Units in 

 the Electromagnetic Unit , 224 



On the Determination of the Angular Distance of the Colours, 

 by M. A. Eosenstiehl , . . ; 228 



On a Method for Amplifying Displacements of the Plane of 

 Polarization, by M. H. JBecquerel 230 



Change of State — Solid-Liquid, by J. H. Poynting 232 



NUMBEE LXXV.— OCTOBEE. 



Dr. T. Sterry Hunt on the Domain of Physiology ; or Nature 



in Thought and Language 233 



Mr. E. D. Brown on Molecular Attraction 253 



Dr. A. Schuster on the Dynamical Theory of Eadiation .... 261 



Dr. A. Marquand on Logical Diagrams for n terms 266 



Mr. E. H. M. Bosanquet on the History of the Theory of the 



Beats of Mistuned Consonances 270 



Mr. T. Gray on the best Arrangement of the Wheatstone's 



Bridge for the Measurement of a particular Eesistance. 



(Plates IV., Y., & VI.) 283 



Miss E. M. Walton on Liquefaction and Cold produced by 



the Mutual Eeaction of Solid Substances 290 



Mr. A. Tribe on a new Method of Measuring certain Chemical 



Affinities 299 



Mr. E. Shida on the Number of Electrostatic Units in the 



Electromagnetic Unit 300 



Mr. A. Gray's Answer to Dr. Wright's Eemarks on Mr. Shida's 



Measurement of the Number of Electromagnetic Units 



in the Electrostatic Unit of Electromotive Eorce 301 



Explanation of an Anomaly in Double Circular Eefraction, by 



M. Croullebois ' 305 



On the Light of Comets, by M. Eespighi 306 



On the Magnetic Metals, by M. Gaiffe 307 



NUMBEE LXXVL— NOVEMBEE, 



M. H. Becquerel's Experimental Investigations on Magnetic 

 Eotatory Polarization in Gases. (Plates VII. & VIII.) 309 



Dr. S. L. Hart on some Capillo-electric Effects, and a Theory 

 of Contact-Potential 324 



