B. MiYAZAWA HI 



results Are in tign'iMuent with iiiiiu\ A(*c(inliii^ t<i him ihv ^rctn coioiir 

 of leaves behaves as dominant UiwanlH the* yellow (rhlttrina), and in 

 Ft the ratio of grtn^n and yell«»w plants in ',\: 1. Thr ^'enrtie lN>havioiir 

 of flower colour is very complex, hut if we elaHnify pinntM simply into 

 thitse with e<»loured tind those with whitr flowi'i-x, white in r<'e<'HMi\r. 

 and in f\ the ratio of the two kin<ls of plants is .*{:!. In sninr **( 

 these ct»loured flowers tht' eorolla is whitr at its margin, sn as to torm 

 a nng-sha}KMi white patch (sre the tcxl-Hi(.), what .lajwmese ganhnirs 

 call the "hukurin'." Take/jiki studied the inhiTitJUJc** of whit«- 

 niargineil flowers, and foun<l that the " hukurin "' is pnKluc<M| hy a 

 special fjict4>r acting as a white dominant at the margin of the corolla 

 so that the hybrid bt^ween a nice with white-margined flowers and 

 another with fully -colounni ones wjis foun<l t^> pnKluce the former kind 

 of flowers in F^ and to segregate in F.. int«» th*- ratio '} white-margined : 1 

 fully-coloured. Mori'over, he rej)orted that in certain cases there is even 

 a factor which inhibit>s the action of that prmlucing the "hukurin" 

 part. 



Experiments. 



The plants originally used in my experiments are characterised as 

 follows : 



A. Leaf is yellow^ {chlorina) (PI. II, fig. 6), and flower white, though 

 its throat is tinged with extremely light magenta (PI. II, fig. 2). 



B. Leaf is green (PI. II, fig. 5), and flower dark-red' (PI. II, ^y^. I ). 

 These two j^arents were cultivated for two years before my exjxTi- 



ments had begun, and since then this cultivation has been continued 

 during five years. Both of them were found during cultivation to 

 breed true entirely to their resjK^ctive types. 



In 1913 I performed the hybridisation between these two plants in 

 both reciprocal ways, and in 1914 three individuals from each were 

 grown for the purpose of further experiments. 



((/) F^ Generation. 



Leaf was green : that is, green is dominant to yellow. Flower- 

 colour was entirely different from that of either parent, and was light 



' I shall sometimes use this word to indicate such a white patch. 



* The word "yellow'' is used always in this paper for brevity's sake, but naturally it 

 means yellowish green. 



' This colour corresponds nearly to No. 42 (Kouge) of the "Code des Couleurs" by 

 Klincksieck and Valette, Paris, 1908. 



