vi CONTENTS. 



Page 



Art. IX. — On the Relation of Magnetism to Diamagnetism. By 

 M. Plucker, Professor of Natural Philosophy in the Uni- 

 versity of Bonn 376 



Art. X. — Investigations on Radiant Heat. (Second Memoir.) 



By H. Knoblauch 383 



Art. XI. — On the Spectra of Fraunhofer formed by Gratings, 

 and on the Analysis of their Light. By O. F. Mossotti, 

 Professor of Mathematics in Pisa 435 



Art. XII. — Memoir on the Nocturnal Cooling of Bodies exposed 

 to a free Atmosphere in calm and serene Weather, and on 

 the resulting Phsenomena near the Earth's Surface. By M. 

 Melloni 453 



Art. XIII. — On the Excitation and Action of Diamagnetism 

 according to the Laws of Induced Currents. By Prof. W. 

 Weber 477 



PART XX. 



Art. XIV. — On the Measurement of Electro-dynamic Forces. 



By W. Weber 489 



Art. XV. — Memoir on the Nocturnal Cooling of Bodies exposed 

 to a free Atmosphere in calm and serene Weather, and on 

 the resulting Phsenomena near the Earth's Surface. (Second 

 Memoir.) By M. Melloni 530 



Art. XVI. — Experimental Researches on the Action of the 

 Magnet upon Gases and Liquids. By M. PlCcker, Pro- 

 fessor of Natural Philosophy in the University of Bonn .... 553 



Art. XVII. — On a simple Method of increasing the Diamag- 

 netism of Oscillating Bodies : Diamagnetic Polarity. By 

 Prof. PlIjcker 579 



Art. XVIII. — Experimental and Theoretical Researches on the 

 Figures of Equilibrium of a Liquid Mass withdrawn from the 

 Action of Gravity. By J. Plateau, Professor at the Uni- 

 versity of Ghent, Member of the Royal Academy of Bel- 

 gium, &c 584 



