A GENETICO-PHYSIOLOGICAL STUDY ON THE FORMATION ETC. 
39 
In tlie case of the cross “ Daikkoto ” X “ Togo ” reds and browns wmre 
often difficult to distinguish accurately owing to the faintness of the red pigment 
and the rapidity in change to the brownish colour. A considerable deviation 
from the expectation thus arose, though the observed numbers are fairly close 
to the approximation to a 9:3:4 ratio. 
Thirty six browns and twelve faint yellows were raised in the next year. 
If a 9 : 3 : 4 ratio is accepted, we should expect among browns which include 
reds and browns, two groups of families in the F- generation. One of them 
should throw again red and brown, and the other should not throw red. The 
ratio of two such families should be 3:1. We obtained : 
No. of families which 
threw reds 
No. of families which 
threw no reds 
Total 
Observed 
32 
4 
36 
Expected 
27 
9 
36 
Difference 
+ 5.0±1.751 
-5.0 
Among the red throwing families, the following families are expected : 
Type of families 
Segregation 
1 . 
Bed constant occurring once in every nine. 
2. 
Reds, browns and faint yellows in 9:3:4 ratio occurring four 
times in every nine. 
3. 
Eeds and faint yellows in 3:1 ratio occurring two in every nine. 
4. 
Eeds and browns in 3: 1 ratio occurring twice in every nine. 
Among the families which throw no reds, the following families are 
expected : 
Type of families 
Segregation 
5. 
Brown constant, occurring once in every three. 
6. 
Browns and faint yellowish 3:1 ratio, occurring twice in every 
three. 
We found : 
