No. 560] GENETIC AL STUDIES ON OENOTHERA 463 



Fig. 7 and Fig. 9, 12.59a, and it should be noted that the 

 specimen is not a seedling, but a half-grown rosette com- 

 parable in point of age to the large rosettes (shown 

 above) which represent closely the normal form and size. 

 The dwarfs are delicate plants, very sensitive to drought, 

 and I was able to bring only 46 individuals to maturity. 

 These proved to be in all respects similar to the dwarfs 

 of the F 2 generation, except that they were even smaller 

 in stature and flower size; this further dwarfing was, 

 however, probably due to less favorable cultivation. 

 From the behavior of this F 3 we may, I believe, safely 

 conclude that the dwarfs of the F 2 , representing an ex- 

 treme type, are stable, or homozygous, with respect to 

 their most important characteristics. 



There will now be described the F 3 generation from a 

 small-leaved plant, 11.42/ (Fig. 6), about 1 m. high, with 



