CONTENTS. 



PART I. 



Page 

 Art. I. — On the Mechanical Equivalent of an Electric Discharge, 

 and the Heating of the Conducting Wire which accompanies 

 it. By R. Clausius I 



Art. II. — On the Processes which have taken place during the 



formation of the Volcanic Rocks of Iceland. By R. Bunsen 33 



Art. III.— On the Dependence of Radiant Heat in its passage 

 through Crystals upon the direction of transmission. By 

 H. Knoblauch, Professor of Natural Philosophy in the 

 University of Marhurg , 99 



PART II. 



Art. III. — On the Dependence of Radiant Heat in its passage 

 through Crystals upon the direction of transmission. By 

 H. Knoblauch, Professor of Natural Philosophy in the 

 University of Marburg {continued) 101 



Art. IV. — On the Conservation of Force. By Dr. H. Helmholtz 114 



Art. V. — On the Connexion of Diamaguetism with Magnetism 



and Electricity. By M. W. Weber 163 



Art. VI. — On the Work performed and the Heat generated in a 



Conductor by a Stationary Electric Current. By R. Clausius 200 



PART III. 



Art. VI. — On the Work performed and the Heat generated in a 

 Conductor by a Stationary Electric Current. By R. Clausius 



{continued) 201 



