372 
LOCK : STUDIES IN PLANT BREEDING 
Of the 21 plants arising from yellow seeds (F 2 ), 6 produced 
only yellow seeds (F 3 ), namely, 71 seeds all bright orange-yellow in 
colour. The remaining 15 plants gave rise to both yellow and green 
seeds—altogether 118 yellow and 32 green, or 3*7 to 1. In the most 
doubtful cases (perhaps half a dozen in all) in which the colour could 
only be seen indistinctly through the testa, on removal of the latter 
the cotyledons were found to be either bright yellow or bright green. 
It is therefore safe to assert that practically all the seeds were 
either fully yellow or fully green; certainly the “green” seeds 
did not include so high a proportion of examples mottled with yellow 
as in the case of Telegraph. And it thus appears as if the act of 
crossing had rendered the green pigment more stable in the extracted 
homozygotes. 
The following scheme indicates the course of this experiment :— 
No. 1 x Telegraph 
I 
F j. 31v 
I 
6 
Fa. 
F r 
68y 39 
21 (36*5 per cent.) 
6 (28 per cent.) 15 11 
71y 118y 32g ( :1 per cent.) 88g 
2 .—Telegraph x Native pea No. 1, F 2 , F 3 , and F 4 .—The cotyledon 
colour of the seeds (F 2 ) on F l plants gathered in February and at 
the end of July, 1903, were detailed in Table I., the total being 
302 yellow, 86 green. The following table embraces the same 
detail for a further series gathered on October 10th, 1903, in very 
wet weather :— 
No. 
Y. 
G. 
, No. 
Y. 
G. 
No. ' 
Y 
G. 
618.1 
8 
5 
.3 
8 
6 
636.1 
16 
10 
.2 
11 
4 
.4 
6 
2 
.2 
11 
4 
.3 
17 
4 
626.1 
14 
3 
.3 
22 
6 
.4 
9 
4 
.2 
10 
7 
637.1 
11 
2 
.5 
16 
1 
.3 
10 
3 
.2 
4 
2 
.6 
11 
3 
.4 
9 
4 
619.1 
16 
2 
627.1 
13 
4 
Total .. 
263 
87 
62 .1 
8 
1 
627.2 
10 
5 
620.2 
9 
3 
.3 
14 
2 
i 
