A MUTANT ON ITS NATIVE HEATH 



Figure 6. Three rosettes of the normal O. laiimrkiaiia are shown, and in the right 

 foreground is one of the mutants, a tiny plant of the type called O. nanclla by de Vries. 



Inn fuUNDATION OF A GREAT THEORY 



Figure 7. Even should de Vries' theory of evolution be finally discarded by students 

 of biology, there could be ro doubt of the value of his researches. They gave the impetus 

 so much needed to make the study of evolution an experimental rather than theoretical 

 science. Great strides have been made in our understanding of heredity and evolution, 

 until now we have reached the paradoxical position of realizing how little we really know- 

 about this most interesting of subjects, — the scientific study of life itself. 



