454 THE AMERICAN NATURALIST [Vol. XLVII 



number of remarkable forms appeared in the F 2 culture 

 in addition to the segregates, forms which no taxonomist 

 would think of relating to either parent of the cross or 

 to the Y x hybrid plant 10.30L«. Some of these forms 

 were sterile, but the 141 peculiar dwarfs from etiolated 

 rosettes and the extreme types showing progressive evo- 

 lution were fertile, as was the culture, as a whole. 



The problem which I outlined for study through the 

 F 3 generation was two-fold: (1) Would extreme types of 

 the F 2 , such as the dwarfs, hold their characteristics, and 

 (2) Would a selfed plant representative of the mass of 

 the F 2 produce an F 3 progeny with points of similarity 

 to the F 2 generation? If this proved true there would be 

 presented a behavior analogous to that of Lamarckiana 



