98 
S. IKENO : 
Crossing Experiments. 
Cross I. White-1 X orange and vice versa. (PI II, fig. 8 and 3). 
ccrrbbx CCrrbb F^Ccrrbb 
The wliite variety designated here by the name white-1 has greenish 
stems and leaves, white petals, filaments, stigmas, and lightly greenish styles ; 
while the orange variety has reddish stems and leaves, orange petals, red 
filaments, stigmas, and styles. The following crosses were made : orange x 
white-I in 1915, white-I x orange in 1916 and 1917. The -plants have 
paler orange flowers than in the orange parent (s. the Table of Colours, p. 96). 
The offspring in I^-and I^-generation are indicated in the Table I ; it may 
here be remarked that the difference of homo-and heterozygous orange plants 
in these generations is so slight in respect to their colour that we could 
Table I. 
jF,- generation (1916, 1917, 1918). 1 
No. of -offspring. 
2 
\ -parent. 
Orange 
White. 
Totals. 
Orange x white-I. 
42 
14 
56 
"White-I x orange, No. I. 
17 
7 
24 
5 » 
» » II. 
22 
8 
30 
Total. 
Actual 
81 
29 
110 
Expected 
82-5±4-5t 
27-5±4-5 
110 
F 3 -generation (1917, 1918). 
Colour of F 2 -parent. 
No. of 
selfed 
plants. 
No. of F a -offspring. 
Orange 
White. 
Totals. 
Orange . 
4 
131 
0 
131 
Expected 
131 
0 
131 
Orange . 
7 
190 
62 
252 
Expected 
189±6-9 
63+6 9 
252 
White. 
4 
( 
0 
28 
' 28 
Expected 
0 
28 
28 
1 The results of F.,-, I<’ 3 -generations, etc. in all my crosses were recorded in my field-book 
separately for each flower, but in the present paper the offspring derived from one cross are 
collected together for brevity’s sake, except in some special cases. 
+ The figures affixed to the expected numbers denote always their respective standard errors 
calculated by the well-known formula <r = ^/npq. 
