CONTENTS 



OP 



THE FIKST VOLUME 



CHAPTER 



I. THE CONSTITUTION OP NATURE , . . 3 



II. RADIATION . . . . . . . 28 



in. ON RADIANT HEAT IN RELATION TO THE COLOUR 



AND CHEMICAL CONSTITUTION OF BODIES . 74 



IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT . 96 



V. THE SKY ....... 131 



VI. VOYAGE TO ALGERIA TO OBSERVE THE ECLIPSE . 142 



VII. NIAGARA . . . . . . 175 



VIII. THE PARALLEL ROADS OF GLEN ROY , . . 205 



IX. ALPINE SCULPTURE . . . .229 



X. RECENT EXPERIMENTS ON FOG-SIGNALS . . . 253 



XI. ON THE STUDY OF PHYSICS . . . .281 



XII. ON CRYSTALLINE AND SLATY CLEAVAGE . . . 304 



XIII. ON PARAMAGNETIC AND DIAMAGNETIC 1OUCES . 321 



XIV. PHYSICAL BASIS OF SOLAR CHEMISTRY . . . 329 

 XV. ELEMENTARY MAGNETISM . . . 343 



XVI. ON FORCE . . . . . . 369 



XVII. CONTRIBUTIONS TO MOLECULAB PHYSICS , 386 



