HUGO DE VRIES 



Hugo de Vries is director of the Botanic Garden in Amsterdam, Holland. He is the 

 greatest living exponent of the origin of species by sudden constant variations, or 

 mutations. His early investigations on variation, which convinced him of the truth of 

 the mutation theory, extended over a period of nearly twenty-six years and involved 

 experiments and breeding tests with some hundred species of wild plants. His experi- 

 ments and theories are set forth in his greatest work, "Die Mutations Theorie,"and 

 in numerous succeeding books and articles. In his method of work and in the im- 

 portance of his results De Vries is perhaps more nearly comparable to the great 

 Darwin than any other living investigator 



