V1U CONTENTS OF VOL. XLVII. FOURTH SERIES. 



Page 

 the prolongation of the axis of the Magnet, by MM. Auguste 



de la Eive and Edouard Sarasin 462 



Experiments on Apparent Adhesion, by M. Stefan 465 



On a Spark-adjuster for the Holtz Machine, by James J. 

 Minot 467 



Index 468 



PLATES. 



I. Illustrative of Mr. J. Y. Buchanan's Paper on an Apparatus for Gas- 

 Analysis. 



II. Illustrative of Mr. J. Croll's Paper on the Physical Cause of Ocean- 

 currents. 

 III. Illustrative of Prof. J. P. Cooke's Paper on the Vermiculites, and 

 M. G. Lippmann's on the Connexion between Capillary and Elec- 

 trical Phenomena. 



IV. Illustrative of M. F. Kohlrausch's Papers :— on the Determination of 

 the Absolute Value of the Siemens Mercury Unit of Electrical 

 Resistance ; and on a Variation- Barometer. 



