CONTENTS 



OP 



THE FIRST VOLUME. 



PAGE 



I. THE CONSTITUTION OP NATURE r , ..,. .. . ......' Jl 



II. RADIATION . . . . . 28 



III. ON RADIANT HEAT IN RELATION TO THE COLOUR. 



AND CHEMICAL CONSTITUTION OF BODIES . 74 



IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT . 96 

 V. ON DUST AND DISEASE . . . . . 131 



VI. VOYAGE TO ALGERIA TO OBSERVE THE ECLIPSE . . 194 



VII. NIAGARA ....... 227 



VIII. THE PARALLEL ROADS OP GLEN ROY . . . 267 



IX. ALPINE SCULPTURE ..... 281 



X. RECENT EXPERIMENTS ON FOG-SIGNALS . . . 305 



XI. ON THE STUDY OF PHYSICS .... 333 



XII. ON CRYSTALLINE AND SLATY CLEAVAGE . . . 356 



XIII. ON PARAMAGNETIC AND DIAMAGNETIC FORCES . 373 



XIV. PHYSICAL BASIS OF SOLAR CHEMISTRY . . . 381 



XV. ELEMENTARY MAGNETISM * . . . 395 



XVI. ON FORCE . . . . . . 421 



XVII. CONTRIBUTIONS TO MOLECULAR PHYSICS , 438 



