THE KKI) MITANT, Fl 



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Adult plant of Oenothera ruhricalyx, a young seedling of which was shown in the preceiling 

 illustration. The number of chromosomes in its cells is 14, as in those of its jiarent; Dr. 

 Gates therefore argues that the origin of the mutation must be chemical in nature, and 

 not morphological. (Fig. 7.) 



