478 On the Latent Capacity for Mutation. 



in the year 1894 in which three of the sixteen individuals 

 that were grown showed signs of spHtting in the quite 

 young rosettes; two of these developed strong and tall 

 flowering stems. The fasciation repeated itself, here and 

 there, on these plants. 



In my later cultures (1895-1900) fasciation grad- 

 ually came to show a predilection, so to speak, for two 

 distinct periods on the life of the plant. First for the 

 seedling stage. In this case the axis divides either above 

 the cotyledons, or above the first two leaves. There arise 



Fig. io8. Oenothera Lamarckiana. A double rosette of 

 radical leaves at the beginning of July. The cotyledons 

 are still on. 



in this way two rosettes, whose leaves intertwine because 

 of the closeness of the two axes to one another. In the 

 plant figured in Fig. 108 I have bent the two axes apart 

 and separated the two groups of leaves as much as pos- 

 sible before photographing it, in order to make the figure 

 clearer. When a plant like this grows up it usually has 

 two equall}^ strong stems which attain the same height 

 and begin to flower at the same time. I have only arti- 



