A GENETICO-rHYSIOLOGICAL SITDY ON THE FORMATION ETC. 



What is designated as imperfect hlack is a new type. It dlflers from 

 the self bkck by the incomplete development of the authocyaniu pigment, 

 resiiltiug in the brown gimind-colour being made visible (see Plate I). The 

 gi'oimd colour of the imperfect black appeared to be brown instead of Imff, 

 1)ut in the F^ generation, they threw only imperfect black and l)itil' l>nt no 

 brown. It seems therefore that the buif colour was deepened by the action 

 of the gene which develops the anthocyanin in the same epidermal cell. The 

 l^resent instance resembles that of the palea coloiu- observed in the cross 

 " Hanbun-nento " x " Grenroku-mochi " in which the self jjiu-ple was completely 

 linked with the brown ground-colour and the locahzed puiple excluded the 

 latter. In Iwth cases, the full development of anthocyanin is in some way 

 associated with the brown pigment. 



