H. M. Leake 



227 



the leaf factor in all cases exceed the corresponding parental or mean 

 parental value, the excess being practically identical (0'31, OSo and 

 0"38) in the three cases. This excess, thmigh small, appears definite 

 but has so far received no explanation. 



Fi 



Parents 



11 16 21 26 31 36 41 



Type 4 x Type 8 

 Diagram 1. 



In one case only has each plant of the F, generation been self- 

 fertilised and the F.^ generation raised from the seed so obtained. The 

 results are set out in Table XIV. In this table the extreme and 



Journ. of Gen. i 16 



