70 



I. NAGAI 



T.U5LE 30. 



Showing the result obtained in F:\ of the cross '■ Waremame" x " Aehntauri' 

 See also Tal.le 33. 



The difierent coloiu- types of the suv bean seed coat so fai- concerued 

 constitute the following series when they are aiTauged according to domiuaucy : 

 blue tinged green > blue tinged yellow > green > yellow > black > imperfect 

 black > browns (lighter brown >deep3r brown) > buff. 



It is of interest to compare tha case c)f tha say bean to that of the 

 Adzuki lieau -nhich have been investigated I)}- Takahashi and FUKUYAMA 

 (1917)'. They have shown that the different colour typas behaved strictly in 

 accordance with MeudeUan principle as iu the case with thä say bean. The 

 different types can be aiTanged, according to dominancy, as follows : Blue 

 black > black > black flecked (" Yogore "j>bkck flecked red>greeuish grey> 

 deep buff (" Cha ") >red (self) > red-eyed white> white. 



The test for the chromogenic substances akeady romarkeil (see Table 8) 

 shows that the chi'omogenic substance P and F are present iu the green, 

 mu-ipe beans of all the coloured types but absent iu white which is a " warm 

 bufl'" according to the nomenclature by RrDGWAY. White is the most recessive 

 character in the series. In the case of the soy boau, the typas which show 

 verp lifile chromogen content are green and yellow ■which are dominant over 

 the types rich in the chromogenic substauca. The diflerence iu the genetical 



1. 'I'akahasbi, Y. and Fvkvsatha. J. Morphological aul Genetio Stmlies on the Ailzuki-bean. 

 Hokkai<lo Agric. Exp. Station. Japan. EeiKJrt 7. jip. Ißl (in .Tajianese). 



