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Mutation Behavior as Observed by DcVries in O. 

 Lamarclciana and His Hvoothesis of Mutation Periods 



Mutation Behavior as Produced in Leptinotarsa and 

 Genctico-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. 



