604 



Thirty-second Annual Report 



heading date fell within or earlier than the range of the heading 

 dates of the early parent (Sonora), and late if within or later 

 than that of the late parent (Turkey), the remainder being 

 classified as intermediate. Ninety-eight F3 plants were grown 

 from seed of the early F2 plants of family No. 2, and the 

 mean heading date was March 27, while that of 143 plants of 

 the early parent (Sonora) was March 25. (See Fig. 5C.). 



Fig 5 — Curves showing: inheritance of earliness (as indicated by 



date of appearance of first head) through four generations of 



a cross between an early (Sonora) wheat and 



a late (Red Turkey) wheat. 



During the season of 1920-21, 173 F^ plants were grown from 

 seed of F3 early plants of family No. 2, and the range of head- 

 ing dates was five days narrower than that of the original early 

 parent (Sonora). (See Fig. 5D.). Intermediate selections 

 in both the Fj and F^ generations had ranges of heading dates 



