106 
S. IKENO : 
and B were always absolutely linked to each other, we will have naturally 
no means of discerning the composite nature of this factor-complex, but some¬ 
times the linkage is broken down, at least partially, and we are then enabled 
to disclose its real nature (s. the Cross VIII, p. 112 ff.) 
Cross VI. TVhite-II x magenta. (PL II. fig. 7 and 1). 
ccBBBB x CCBBBB F x = CcBB BB. 
Though white-II is externally very similar to wliite-I, it may differ 
sometimes from the latter in certain respects. The white-II bears white 
petals like the wliite-I ; but sometimes (not always) they have few magenta 
stripes or spots ; filaments are white, but often some few ones are magenta (s. 
p. 120). The /^-hybrids (1918) bear magenta flowers, whose colour intensity 
is almost perfectly similar to that of the magenta parent (s. the Table of 
Colours, p. 96). As the white-I and white-II are genotypically different from 
each other, the composition of the .^-offspring produced ex white-II x magenta 
is quite different from that of those ex white-I x magenta (Cross V). Thus 
we have the results shown in the Table V (s. p. 107.) 
In this Table we see both in F, and F ?I the production of a certain 
number of unexpected individuals. Thus 8 out of 10 ^-plants have segregated 
in F 2 into magentas and whites, as was just expected, whereas each of the 
remaining two has produced besides these two classes of the segregates 1 
orange which is quite unexpected. The formation of these two oranges is 
very difficult to be accounted for, and it might be due to the contamination 
from other families, though utmost care was taken for avoiding such. Till 
the contrary to the latter assumption will be definitely established these two 
oranges will not be taken into account, and then we see clearly that each of 
these F y parents is of the constitution CcBBBB. 
In F :] generation three magentas have produced among others 1 flesh- 
coloured, 1 orange and 1 pseudo-white (Table V, P 3 , Nos. 2, 3, 4), and two other 
magentas 3 flesh-coloured and 5 red plants (Table V, F :i , Nos. 6 and 7). Since 
the genotypic constitution of flesh-coloured and pseudo-white races is not yet 
exactly known it is naturally impossible to make any surmise about the mode 
of their production (though probably by mutation), and these unexpected 
plants must here be left out of account. The production of the orange and 
