CONTENTS OF VOL. XX. FIFTH SERIES. V 



Page 



On the Disengagement of Heat in the Swelling and Solution 



of Colloids, by E. Wiedemann and Ch. Ludeking 220 



On a Mercury-Galvanometer, by G. Lippmann 220 



NUMBER CXXIV.— SEPTEMBER. 



Dr. J. A. Fleming on the Distribution of Electric Currents 

 in Networks of Conductors treated by the Method of 

 Maxwell. (Plates VI. & VII.) " 221 



Dr. T. Carnelley on the Periodic Law, as Illustrated by certain 

 Physical Properties of Organic Compounds. — Part I. The 

 Alkyl Compounds of the Elements 259 



Dr. J. D. Dana on the Origin of Coral Reefs and Islands . . 269 



Dr. J. Hopkinson on an unnoticed Danger in certain Appa- 

 ratus for Distribution of Electricity 292 



Dr. W. W. J. Nicol on Supersaturation of Salt-Solutions .... 295 



Notices respecting New Books : — 



Messrs. Glazebrook and Shaw's Textbook of Practical 

 Physics 300 



On the Electrical Resistance of Alcohol, by M. Gr. Eoussereau. 301 



The Volcanic Nature of a Pacific Island not an Argument for 

 little or no Subsidence, by J. D. Dana 303 



On the Quantity of Electrical Elementary Particles, by E. 

 Budde 303 



NUMBER CXXV.— OCTOBER. 



Mr. F. Steuger on the Electric Conductivity of Gases. (Plate 

 IX.) ." 305 



Mr. R. H. M. Bosanquet on Electromagnets. — IV. Cast Iron, 

 Charcoal Iron, and Malleable Cast Iron 318 



Dr. J. J. Hood on the Influence of Heat on the Rate of Che- 

 mical Change 323 



Mr. S. Bidwell on the Generation of Electric Currents by 

 Sulphur Cells 328 



Dr. J. Hopkinson on the Seat of the Electromotive Eorces in 

 a Voltaic Cell 336 



Mr. R. T. Glazebrook on a Comparison of the Standard Resist- 

 ance-coils of the British Association with Mercury Standards 

 constructed by M. J. R. Benoit of Paris and Herr Strecker 

 of Wiirzburg 343 



Lord Rayleigh on the Accuracy of Eocus necessary for Sensibly 

 Perfect Definition 354 



Lord Rayleigh on an Improved Apparatus for Christiansen's 

 Experiment 358 



Lord Ravleigh's Optical Comparison of Methods for observing 

 Small Rotations 360 



