IV CONTENTS OF VOL. XXIV. FOURTH SERIES. 



NUMBER CLIX.— AUGUST. 



Page 



Prof. Clausius on the Application of the Theorem of the Equi- 

 valence of Transformations to the Internal Work of a mass of 



Matter 81 



Major-General Sabine on the Cosmical Features of Terrestrial 



Magnetism 97 



Dr. Joule on the History of the Dynamical Theory of Heat . . 121 



Prof. Field on some of the Basic Salts of Copper 123 



MM. J. G. S. van Breda and W. M. Logeman on Amperian 



Repulsion 126 



Sir W. R. Hamilton on the Existence of a Symbolic and Bi- 

 quadratic Equation, which is satisfied by the Symbol of Linear 



or Distributive Operation on a Quaternion 127 



Prof. Plateau on the Figures of Equilibrium of a Liquid Mass 



without Weight. — Sixth Series 128 



Prof. Challis on the Mathematical Theory of the Vibrations 



of an Elastic Fluid 135 



Proceedings of the Royal Society : — 



Prof. W. Thomson on the Measurement of Electric Re- 

 sistance 149 



Proceedings of the Royal Institution : — 



Prof. Faraday on Gas-Furnaces, &c 162 



Proceedings of the Geological Society : — 



Prof. Harkness on the Metamorphic Rocks of the Banff- 

 shire Coast, &c 1 65 



The Rev. D. Honeyman on the Geology of the Gold-fields ,—-.,.-' 



of Nova Scotia , 165 



Mr. J. W. Salter on some Fossil Crustacea; on some 

 Species of Eurypterus and allied forms; on Peltocaris; 

 and on a Crustacean Track in the Llandeilo Flags of 



Shropshire 166 



On the Density of Ice, by L. Dufour 167 



On a new Metal in the Native Platinum of Rogue River, Oregon, 

 by C. F. Chandler, Professor of Chemistry at Union College. 168 



NUMBER CLX.— SEPTEMBER. 



Prof. Tyndall on the Conformation of the Alps 169 



Prof. Tyndall on Mayer, and the Mechanical Theory of Heat. . 173 

 M. R. Franz on the Diathermancy of the Media of the Eye. ... 176 

 Dr. Atkinson's Chemical Notices from Foreign Journals .... 185 

 Mr. G. B. Jerrard's Note on some Objections of Mr. Cayley 



and Mr. Cockle 193 



Prof. Challis on the Principle of Discontinuity in Solutions of 



Problems in the Calculus of Variations 196 



Prof. Clausius on the Application of the Theorem of the Equi- 

 valence of Transformations to the Internal Work of a mass of 

 Matter 201 



