IV CONTENTS OF VOL. XXX. FIFTH SERIES. 



Page 



Diamagnetism tested by Carnot's Principle — Theoretical Pre- 

 diction, by J. Parker 124 



An easy mode of producing the Active Spark in Hertz's Ex- 

 periments, by H. Classen 125 



On the Experiments of Hertz, by L. Boltzmann 126 



Lecture-experiment to demonstrate the Excitation of Elec- 

 tricity by Light, by W. Hallwachs "J 27 



Investigation of Electrical Resonance, by Dr. E. Lechner .... 128 



NUMBER CLXXXIIL— AUGUST. 



Prof. J. J. Thomson on some Experiments on the Velocity of 

 Transmission of Electric Disturbances, and their Application 

 to the Theory of the Striated Discharge through Gases .... 129 

 Messrs. W. G. Robson and S. W. J. Smith on the Diurnal 



Variation of the Magnet at Kew 140 



Mr. H. Tomlinson on the Effect of Change of Temperature 



on the Villari Critical Point of Iron. (Plates III. & IV.). . 145 

 Messrs. M. Maclean and Makita Goto on the Electrification 



of Air by Water- Jet 148 



Mr. A. B. Basset on an Electromagnetic Theory of Quartz . . 152 

 Mr. E. J. Smith on a Method of Eliminating the Effects 

 of Latency of Electromagnetic Styli, in Chronographic 



Measurements , 160 



Dr. J. H. Gladstone and Mr. W. Hibbert on Secondary 



Batteries '. 162 



Mr. J. Brown on Dropping-Mercury Electrodes 170 



Prof. E. Y. Edgeworth on Problems in Probabilities : No. 2, 



Competitive Examinations 171 



Messrs. M. Maclean and Makita Goto on some Electrical 



Properties of Elames. (Plate V.) 188 



Notices respecting New Books : — 



Dr. T. Muir's Theory of Determinants in the Historical 

 Order of its Development. — Part I. Determinants in 



general, Leibnitz (1693) to Cayley (1841) 191 



Proceedings of the Geological Society : — 



Prof. A. von Konen on the Disturbed Rocks of North- 

 western Germany 193 



Prof. J. W. Spencer on the Origin of the Basins of the 



Great Lakes of America 193 



Mr. J. C. B. Hendy on a " "Wash-out " found in the 

 Pleasley and Teversall Collieries, Derbyshire and 



Nottinghamshire 194 



Mr. D. Pidgeon on certain Physical Peculiarities exhibited 

 by the so-called " Raised Beaches '■ of Hope's Nose and 

 the Thatcher Rock, Devon 194 



