LIST OF ILLUSTRATIONS 



PROFESSOR JACQUES LOEB. Discoverer of artificial par- 

 thenogenesis facing p. 204 



ELIAS METCHNIKOFF. Pasteur Institute, Paris, famous 



for his researches in immunity .... facing p. 278 



PROFESSOR HENRI BECQUEREL. Discoverer of the 

 "Becquerel rays," or radioactive substances, in his 

 laboratory at the Jardin des Plantes, Paris, facing p. 296 



HEINRICH HERTZ. Discoverer of electrical oscillations, 

 or Hertz waves, which have given us wireless teleg- 

 raphy; died 1894 facing p. 314 



SIR OLIVER LODGE. Principal of the University of 

 Birmingham, one of the first to demonstrate the 

 possibility of wireless telegrahy .... facing p. 336 



