ILLUSTRATIONS 



ENTRANCE TO THE ROYAL SOCIETY ROOMS, BURLINGTON 



HOUSE, LONDON Frontispiece 



ENTRANCE TO THE BRITISH MUSEUM, LONDON . . . Facing p. 6 



ASSEMBLY-ROOM OF THE ROYAL SOCIETY " 16 



LIBRARY OF THE ROYAL SOCIETY " 2O 



ENTRANCE TO THE ROYAL INSTITUTION, LONDON . . " 32 

 PROFESSOR DEWAR'S APPARATUS WITH WHICH HYDRO- 

 GEN WAS FIRST LIQUEFIED " 42 



HAMPSON'S APPARATUS FOR LIQUEFYING AIR .... " 44 



SIR NORMAN LOCKYER " 74 



SKETCH OF SIR WILLIAM RAMSAY " 84 



PROFESSOR J. J. THOMSON " 94 



PROFESSOR W. C. ROENTGEN DISCOVERER OF THE X-RAY " 96 



PROFESSOR HENRI BECQUEREL " 98 



DISCHARGING AN ELECTROSCOPE WITH RADIUM ... " IO2 



SIR WILLIAM CROOKES " 106 



ERNEST RUTHERFORD, F.R.S " IIO 



THE AQUARIUM OF THE MARINE BIOLOGICAL LABORA- 

 TORY " Il6 



TANKS FOR HOLDING SPECIMENS, MARINE BIOLOGICAL 



LABORATORY AT NAPLES " 134 



THE MARKET-PLACE, JENA " 148 



PROFESSOR ERNEST HAECKEL IN HIS STUDY .... " 160 



IX 



