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 II 



THE ORIGIN OF VARIETIES BY MUTATION 



WITH NUMEROUS ILLUSTRATIONS AND SIX COLORED PLATES 



CHICAGO 

 THE OPEN COURT PUBLISHING COMPANY 



. LONDON AGENTS 

 KEGAN I'AL L, TRENCH, TRUBNER & CO., LTD. 



191O 



