GABRIELLE L. C. HOWARD. 107 



ences and diminution in the range of variation in the Fg cultures 

 raised from different variates of the F^ generation and by the 

 isolation in the F3 and succeeding generations of forms like 

 the parents and also of intermediate forms which breed true. 

 This isolation of new forms can easily be explained by a 

 rearrangement of the factors. 



Pusa, 



April 22nd, 1913. 



