CONTENTS OF VOL. IX. FIFTH SERIES. Vll 



Page 

 Mr. J. Herschel on the Determination of the Acceleration of 



Gravity for Tokio, Japan 446 



Prof. Challis on the Hydrodynamical Theory of the Physical 



Forces, including a Theory of the Microphone 448 



On the Theory of Induction-currents, by M. Mascart 452 



Experimental Researches on the Decomposition of some Explo- 

 sives in a closed Vessel, by MM. Sarrau and Vieille 455 



Summary of the Laws which govern Matter in the Spheroidal 



State, by P.-H. Boutigny. . . . 457 



On a General Theorem advanced by Prof. Clausius in refer- 

 ence to Electrical Influence, by G.J. Legebeke 458 



PLATES. 



I. Illustrative of M. Gustav Wiedemann's paper on Torsion. 

 II. ) Illustrative of Frederick Guthrie's Paper on certain Vibrations 



in. f of Solids. 



IV. Illustrative of Mr. J. A. Fleming's Paper on a new Form of Re- 

 sistance-Balance. 



V. Illustrative of Mr. L. Fletcher's Crystallographic Notes. 



VI. Illustrative of Mr. John Bridge's Paper on a Calculating Appa- 

 ratus. 



VII. Illustrative of Dr. J. H. Long's Paper on the Diffusion of Liquids. 



