THE 



MUTATION THEORY 



EXPERIMENTS AND OBSERVATIONS 



ON THE 



ORIGIN OF SPECIES IN THE VEGETABLE 



KINGDOM 



BY 



HUGO DE VRIES 



PROFESSOR OF BOTANY AT AMSTERDAM 



TRANSLATED BY 



PROF. J. B. FARMER AND A. D. DARBISHIRE 



VOLUME I 



THE ORIGIN OF SPECIES BY MUTATION 



WITH NUMEROUS ILLUSTRATIONS AND FOUR COLORED PLATES 



CHICAGO 



THE OPEN COURT PUBLISHING COMPANY 



LONDON AGENTS 

 KEGAN PAUL^ TRENCH, TRUBNER & CO., LTD. 



1909 



