INTRODUCTION 



MADAME CURIE, of the Uni- Copyright by Underwood & Underwood 



versity of Paris, who discovered GUGLIELMO MARCONI, who in- 



radium. vented wireless telegraphy. 



EDWARD JENNER, who about Louis PASTEUR, who discovered 



1800 discovered a method of pre- the germs of many contagious dis- 

 venting smallpox by vaccination. eases and how to kill them. 



SOME OF THOSE WHO HAVE MADE USEFUL DISCOVERIES 



