CONTENTS of N° 308.— Fourth Series. 



LIV. On Diffraction-Spectrum Photography. By Henry Dra- 

 per, M.D., Professor of Analytical Chemistry and Physiology in the 

 University of New York. (Illustrated by a Photograph printed by 

 the Alberttype process.) page 417 



LY. On Hamilton's Dynamic Principle in Thermodynamics. By 

 0. Szily 426 



LYI. On the Fundamental Modes of a Yibrating System. By Lord 

 Rayleigh, M.A., F.R.S 434 



LYIL On a new Spectroscope. By Professor Ch. Y. Zenger . . 439 



LYIII. Reply to Professor Ohallis's further Bemarks " On the 

 Beceived Principles of Hydrodynamics." By Robert Moon, M.A., 

 Honorary Fellow of Queen's College, Cambridge 446 



LIX. On a new Relation between Heat and Static Electricity. 

 By A. "W. BiCRERTOff, F.C.S., Associate of the Royal School of Mines, 

 Lecturer on Experimental Science, Winchester College, and the 

 Hartley Institution, Southampton 450 



LX. A Discourse on Molecules. By J. Clerk Maxwell, M.A., 

 F.R.S., Professor of Experimental Physics in the University of 

 Cambridge 453 



LXI. On the Differential Galvanometer. By Oliver Heaviside, 

 Newcastle-on-Tyne 469 



LXII. On certain remarkable Molecular Changes occurring in 

 Iron Wire at a low red Heat. By W. F. Barrett, F.C.S., Professor 

 of Experimental Physics in the Royal College of Science, Dublin . . 47S 



LXIII. On the Relationship of the Magnetic Metals. By W. F. 

 Barrett, F.C.S 47* 



LXIY. Intelligence and Miscellaneous Articles : — 



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



Cazin 48 



Experiments on Evaporation, by M. Stefan 48 



Index 48 



With Title-page, Contents, &c. 



It is requested that all Communications for this Work may be addresse 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, R< 

 Lion Court, Fleet Street, London. 



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