CONTENTS OF VOL. XLVI. FOURTH SERIES. Vll 



Page 

 A Contribution to the History of the Horizontal Pendulum, 



V V 



by Professor Safarik 412 



NUMBEE CCCVIIL— DECEMBER. 



Dr. H. Draper on Diffraction-Spectrum Photography. (Illus- 

 trated by a Photograph printed by the Alberttype process.) 417 

 M. C. Szily on Hamilton's Dynamic Principle in Thermody- 

 namics 426 



Lord Eayleigh on the Fundamental Modes of a Vibrating 



System 434 



Prof. Ch. V. Zenger on a new Spectroscope 439 



Mr. E. Moon's Eeply to Prof. Challis's further Eemarks " On 



the Eeceived Principles of Hydrodynamics " 446 



Mr. A. W. Bickerton on a new Eelation between Heat and 



Static Electricity 450 



Prof. J. C. Maxwell on Molecules 453 



Mr. 0. Heaviside on the Differential Galvanometer 469 



Prof. W. E. Barrett on certain remarkable Molecular Changes 



occurring in Iron Wire at a low red Heat 472 



Prof .W. E. Barrett on the Eelationship of the Magnetic Metals. 478 

 On various cases of Intermission of the Voltaic Current, by A. 



Cazin 481 



Experiments on Evaporation, by M. Stefan 483 



Index 485 



