B. MiYAZAWA 75 



TAHLK XXII. 



, 4 Whit«niarKinc<l 'Ih / 



I "*^ f Kullyoolouml n i *'^ 



Orwin ,^ . , < \Vhil4'iniirRined 10 i 



f Fiillycoloured 26 ) 



' While 



Yellow .. 



ratio of planus with ivd and dark tcmI Howcrs would Ix- also 1:1. I>a 

 118 now oxaniino Table XXII to soo whether or not our exp'ctation is 

 fulfilliHl. Firstly, all plants an' green. Secondly, there are -Mi plants 

 with white-margined and 40 fully-coloun'd flowers, thus their ratio is 

 1:1, the deviation and the standard t'rror being ± 5-500 and ± 4 oOO, 

 respt»ctivi'ly. Again, there are 4() plants with red and .S5 plants with 

 dark-ixnl rtowt'i><, the deviation and the sUuidard error being espial to 

 those of the latter axse, respectively. Thus we see that in every ca.«M' 

 the deviation is larger than the standanl error, but the diti'erences 

 betw^een them are not large, so that it would not be unrejusonable t(» 

 consider that we see in both c;ises segregation in the ratio 1:1. 



The F^ plant used in the back crosses just above mentioned was 

 self-fertilised ; and the results of the examination of the F. generation 

 thus obtained, consisting of Gol individuals in all, have fully confirmed 

 those shewn in Table I. 



Di.scus.sioN OF Results. 



It will be readily seen from all the experiments above mentioned 

 that the hereditary behaviour of leaf-colour is in exact accordance with 

 that obtained by Takezaki (p. (jl). 



The results on the "hukurin" are also the same, at least in some 

 cases, as those reported by him, and in such crises the presence of a 

 factor for producing the " hukurin " part has been duly proven. 



If we simply classify plants into those which can produce anthocyanin 

 on the corolla, at least partially, and those which cannot, their ratio in 

 Ft, F3, ete., is 3:1. Now since, for the formation of anthocyanin, at 

 least two factors are necessary, we may denote them by C and R, re- 

 spectively. Then the dark-red colour is to be repre.sent<'d by CCRR. 

 The white colour, a« we may infer from the results of experiments, 

 should have one (»f these factors; supjwse the latter to be C, then 



