A GENETICO-PHYSIOLOGICAL STUDY ON THE FORMATION ETC. 
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5. Green. 
6. Yellow. 
II. Parti-colour type. 
1. Black mottled, the ground colour brown with or without a green 
tinge. 
2. Black patch around the liilum. The ground colour is either 
yellow or green. 
3. Dark brown patch around the liilum, the ground colour is either 
green or yellow. 
4. Blue tinged around the liilum. The ground colour either green 
or yellow. The margin of the blue tinge is not so distinct as 
in 2 and 3. 
The chromogen can be detected in the immature green seed of all the 
coloured types, except the green and yellow. The chromogenic substance P 
is abundant but the chromogenic substance F is very scarce or absent. In 
the green and yellow, both are nearly absent. Hence the different types can 
be distinguished into two groups with respect to the chromogen. One includes 
those which give a marked cliromogen reaction when the seed is still green 
and the other includes those which give only a slight or no reaction. In 
this regard, the green and yellow correspond with the white type of the 
common garden bean and Adzuki-bean (see Tables 8, 9). 
Since the reaction of the chromogenic substance F is feeble in the seed 
just before the formation of the pigment, the latter must be formed from the 
chromogenic substance P which is present. In the leaf, however, the 
chromogenic substance F occurs in a considerable amount and can readily be 
isolated as yellow crystals. The following table will give a general idea of 
the distribution of the chromogens in the seed coat and the leaf of different 
varieties of soy-beans. 
