CONTENTS OF VOL. XXV. FOURTH SERIES. Vll 



Page 

 Prof. Sylvester on Theorems relating to " Canonic Roots" . . 453 

 Prof. Challis on the Source and Maintenance of the Sun's Heat. 460 

 M. Verdet's Historic Notice of the Mechanical Theory of Heat. 467 

 Notices respecting New Books : — 



Mr. H. Watts 's Dictionary of Chemistry and the Allied 



Branches of other Sciences 473 



Mr. O. Byrne's Dual Arithmetic, a New Art 475 



Proceedings of the Royal Society : — 



The Rev. S. Haughton on the Reflexion of Polarized Light 



from Polished Surfaces « 478 



Mr. G. Gore on the Properties of Electro-deposited Anti- 

 mony 479 



Mr. B. Stewart on the Forces concerned in producing the 



larger Magnetic Disturbances 480 



Mr. F. Jenkin on the Laws of Transmission through 



various lengths of one Cable 483 



Dr. Joule and Prof. W. Thomson on the Thermal Effects 



of Fluids in Motion 486 



Dr. Robinson on the Spectra of Electric Light, as modified 

 by the Nature of the Electrodes and the Media of 



Discharge 486 



Mr. B. C. Brodie on the Oxidation and Disoxidation effected 



by the Alkaline Peroxides 489 



On the Velocity of the Propagation of Sound in Gaseous Bodies, 



by J. Stefan 490 



On the Origin of Amygdaloid Rocks, by Dr. Tschermak .... 491 

 On the Motion of Camphor towards the Light, by C. Tomlinson. 492 



NUMBER CLXXL— SUPPLEMENT. 



Dr. Mayer on the Mechanical Equivalent of Heat 493 



Mr. A. H. Church on some Reactions of Hydride of Benzoyle. 522 



Mr. A. Cayley on the Delineation of a Cubic Scrole 528 



Mr. D. Heath on a passage in Professor Tyndall's Lectures on 



Force and on Heat 53 1 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 536 

 Prof. Steen on the Equations which conduct to the Skew Surface. 546 

 Proceedings of the Royal Society : — 



Mr. C. F. Varley on the Relative Speed of the Electric 

 Wave through Submarine Cables of different lengths. . 548 

 Proceedings of the Geological Society : — 



Sir R. I. Murchison on the Permian Rocks of Bohemia .... 552 

 Dr. Holl on the Correlation of the several Subdivisions of 



the Inferior Oolite of the Middle and South of England. 554 

 Dr. Porter on the occurrence of large quantities of Drifted 



Wood in the Oxford Clay near Peterborough 554 



Mr. H.Woodward on a new Macrurous Crustacean from 

 the Lias of Lyme Regis 554 



