54 
1. N AG AI : 
Tlie rest of the F z families agreed with the expectation except three which 
were apparently contaminated by accidental crossing ; hence they were dis¬ 
carded. The actual numbers are given in Table 34. See also Table 29. 
(c). The Cross : Buff x Black. 
The colour of the seed coat of a variety “ Ware-mame ” is buff, and 
that of a variety “ Achumuri ” is solid black with peculiar mesh-like, white 
markings which are due to the small breaks of the epidermal tissue exposing 
the colourless, underlring tissue of the seed coat (see Plate I). The F, seeds 
born on the F v plant of the hybrid between them were self black. In F, 
self blacks, imperfect blacks, and browns were found with the following 
numbers. 
Table 24. 
Showing the result obtained in the 20 generation of the 
cross “ Waremame ” x “ Achumuri.” 
Self black 
Imperfect 
black 
Brown 
Bluff 
Total 
Ob- 
33 
9 
6 
0 
48 
Exp. 
27 
9 
9 
3 
48 
Diff. 
+ 6.0 
0 
-3.0 
-3.0 
The expected ratio is 9 : 3 : 3 : 1. The buff was not found in the F t plants 
owing to the small number of individuals. In F>, families derived from the 
heterozygous self blacks, buffs were found in the expected ratio. 
Table 25. 
Showing the result obtained in Fi families derived from the 
heterozygous self black F, plants. 
F:i family no. 
Self black 
Imperfect 
black 
Brown 
Buff 
Total 
3 
21 
9 
2 
1 ‘ 
33 
4 
31 
4 
10 
4 
49 
6 
46 
18 
19 
4 
87 
