CONTENTS OF VOL. XXX. FIFTH SERTES. VI I 



Page 



Dr. Davis's Introduction to the Logic of Algebra, with 



Illustrative Exercises 434 



Dr. Forsyth's Theory of Differential Equations. — Part I. 



Exact Equations and Pfaff's Problem 436 



Actinoelectrical Investigations, by A. Stoltetow 436 



On Actinoelectric Phenomena, by J. Borgmann 438 



Stationary Luminous Vibrations, by O. Wiener 438 



Observations on a Paper by Mr. Elux " On the Shape of 



Newton's Eings," by A. Wangerin 439 



On Eluorescent Vapours, by F. Wiedemann 440 



NUMBER CLXXXVIL— DECEMBER, 



Prof. A. Gray on the Dynamical Theory of Electromagnetic 



Action 441 



Lord Rayleigh on the Theory of Surface Forces 456 



Mr. G. H. Bryan on the Deformation of Twisted Strips .... 476 

 Mr. J. Trowbridge on the Motion of Atoms in Electric Dis- 

 charges 480 



Dr. G. Gore on the Greater Influence of First Quantities of 



Electrolytes on Volta-Electromotive Force 483 



Prof. A. Gray on the Magneto-Optical Generation of Elec- 

 tricity 494 



W. von Siemens on the General System of Winds on the 



Earth 497 



On Photographs of Rapidly Moving Objects, by N. Khamon- 



toff * 506 



On Dropping-Mercury Electrodes, by W. Ostwald 506 



Velocity of Sound at very Low Temperatures, by M. Greely. . 507 

 On the Action of Oils on the Motions of Camphor on the 

 Surface of Water, by C. Tomlinson 508 



Index 509 



ERRATA. 



Page 156, line 16, read square of the wave-length. 



— 158, lines 21, 22, and 23, read ?i\~u, ?i'y-v, n'^w. 



— — line 24, read ri for n. 



— 429, end of § 6, for accommodating power read quantity of 



accommodation indicated. 



