3 :r . AS 16 ,'f 10 7 1 



. X-' I 10 II It *7 73 6S (S 39 2S (f 9 f . 



FIG. 48. Photographs to show variation in ear length of two varie- 

 ties of maize (upper row), of their F! offspring (second row), and of 

 their F 2 offspring (third row). (After East.) 



