50 
I. NAGAI .* 
Table 26. 
Showing the segregation of the offsprings of imperfect black 
F> plants. 
Fi family no. 
Black imperfect 
Brown 
Buff 
Totals 
17 
26 
— 
— 
26 
35 
27 
— 
— 
27 
31 
14 
— 
3 
17 
3G 
35 
— 
9 
44 
38 
2G 
— 
5 
31 
39 
39 
— 
15 
54 
40 
4 
— 
2 
6 
41 
5 
— 
1 
6 
176 
35 
211 
An approximation to a dihybricl ratio was confirmed by forty six families 
raised in the F s generation. The details are given in Tables 30 and 35. 
The buff is found to be the most recessive character to any other one in 
the colour characters so far studied. Since the cliromogenic substance can be 
detected in the unripe, green seed of buffe, browns, and blacks, but is nearly 
absent in yellows and greens, and further that yellows and greens are 
dominant over the former colours, it must be concluded that an inhibitor for 
the development of the pigment is present in the green and yellow. 
A mention may be made regarding the brown character. We can dis¬ 
tinguish several browns which differ more or less in hue and shade but 
exact discrimination is very difficult. If it is made among the segregates, the 
lighter shade appears to be domniant over the deeper one. When the distinctly 
reddish brown such as we see in the seed coat of a variety “ Aka-iiedzumime ” 
is crossed with the brown like that we have already dealt with (“ Haiiro ”), 
the reddish brown behaves as a single recessive to brown. The F % seed of 
the cross “ Aka-nedzumime ” X “ Haiiro ” was brown like that of the father 
which is brown with a greyish green tinge. In F z , reddish brown and 
brown, regardless of the green tinge, segregated in the following number : 
