IV CONTENTS. 



Art. VII. — On the Deviation of Projectiles ; and on a remarkable 



Phsenomenon of Rotating Bodies. By G. Magnus 210 



Art. VIII. — On the Motion of Liquids in a closed Galvanic Circuit. 



By G. Wiedemann 232 



Art. IX. — Researches upon the Optical Characters of Double Re- 

 fraction in Isomorphous Substances. By M. H. de Senar- 

 MONT 2.57 



PART IV. 



Art. IX. — Researches upon the Optical Characters of Double Re- 

 fraction in Isomorphous Substances. By M. H. de Senar- 

 MONT (continued) 281 



Art. X. — On the Phaenomena of closed Electro-Magnets. By 



J. C. POGGENDORFF 294 



Art. XI. — On the Nature of those Constituents of the Atmo- 

 sphere by which the Reflexion of the Light within it is 

 effected. By R. Clausius 303 



Art. XII. — On the Blue Colour of the Sky and the Morning 



and Evening Red. By R. Clausius 32G 



Art. XIII. — On the Theory of Diamagnetism, the Explanation of 

 the transition from the Magnetic to the Diamagnetic deport- 

 ment, and the Mathematical treatment of the Phaenomena 

 observed in Crystals. By M. Plucker, Professor of Natural 

 Philosophy in the University of Bonn 332 



FIVE PLATES. 



