PLATE 85 



Fig. 1. Alba-macrophylla series, F, plauts. Photograph of two adjacent 

 plants, llF^Hi^Pj^Paj and llF,H2,P3,Pj3, from the same F, population of the alba- 

 macrophylla series. An illustration of segregation for height in this population. 



Fig. 2. Alba-macrophylla series, an F^ plant. Photograph of a t\^pical Y^ 

 plant, ISF^Ho.P-^P^PjP:^, of a dwarf line of the alba-macrophylla series. The 

 line here illustrated was derived from the dwarf F^ plant shown in figure 1. This 

 line has bred true for seven generations. 



[582] 



