108 
S. IKENO : 
and the remaining two of that CCItBBB. Of 6 whites 2 (Table V, F 3 , No3. 
2 and 3) have produced besides white offspring 7 magenta ones. That each 
of these two white parents is to be regarded to have the constitution ccBItBB 
will be discussed later in this paper (s. Table VIII, Nos. 21 and 22, discussions 
in “ Mutations, etc.” I). 
From the results in F ?) above indicated we see that we have in F 2 4 
homo- and 6 heterozygous magentas (expected, 3\3 and 6 - 6), and that all 
whites are homozygous, whence we may conclude that the actual and the 
expected results agree fairly well to each other. Hence it is evident that this 
cross is based upon one single factor difference. We can also easily under¬ 
stand the reason why this cross will produce quite different results from those 
in the Cross Y where white-I is used instead of white-II, because the latter 
contains both It and J> like our magenta variety, while white-I has none. 
Cross VII. White-IIX orange and vice versa. (PI. IF, fig. 7 and 3), 
ccBBBB x CCrrbb I\ = CcBrBb 
The cross between white-I and orange has been described before (s. p. 98 
ff). That white-II is genotypically different from white-I in spite of their 
external resemblance is especially clear, when we make the cross between the 
former and the orange, because we get then quite different results : the Ff-hybrids, 
• whether from white-II x orange or its reciprocal, bear always magenta flowers, 
whose colour intensity is almost equal to that in our magenta variety (s. the 
Table of Colours, p. 96). As indeed white-II (ccJEtBBB) may be considered 
to be a magenta variety which remains colourless on account of the absence 
of C, it is quite natural that its mating with the orange will produce the 
magenta, C being introduced from the latter parent. The genotypic constitu¬ 
tion of the Ff-hybrid in the present case is therefore perfectly equal to that 
in the Cross YI (p. 106 ), so that the composition of the F- aud F-offspring 
should be naturally quite the same as in those derived from the same cross. 
This fact could be perfectly confirmed experimentally, as we will see from 
the F, and F, offspring presented in the Table YI, A and B. 
