PLATE 40. 



Fig. 1. Portion of a row of the plants of the Fi hybrid H142 — N. Tab. 

 "Maryland" X N. sylvestris. 



Fig. 2. Portion of a row of the plants of the hybrid H121 in F,— F^ H33 X 

 N. sylvestris. In every respect the equivalent of N. sylvestris. 



[330] 



