Modification of Germinal Constitution of Organisms 201 



Mutants t m Mutant* 



, ryrrn t 



' " '^/ * > 



Stem Mutants 



Mutation Behavior as Observed by DeVries in O. Mutation Behavior as Produced in Leptinotarsa and 



Lamartkiana and Hi. Hypothesis of Mutation Periods Genetico-Dynamic Hypothesis of Mutation and Pro- 



duction of Mutating Stem Forms 



FIG. 70. Diagram to show the differences between DeVries' theory of the 

 origin of mutations, and the hypothesis of Mutation as a result of hybrid 

 synthesis of the mutating stem form. 



