SHULL: DUPLICATION OF A LEAF-LOBE FACTOR 



435 



Table 4 



The Compositioti of F^ Progenies from Crosses of Bursa Heegeri simplex and Members 

 of Wild Biotypes of B. bursa-pastoris which Probably Possessed Dimeric B' lobes 



' These families passed the winter in the open field, and suffered "considerable 

 injury. This doubtless accounts tor their very great deviation from the 15 : i 

 ratio. Small samples from each 01 these families retained in the greenhouse vie'ded 

 ratios much nearer to 15 : i. Only for this reason are these families included here 



