FERTILITY IN CICHORIUM INTYBUS 385 
Table 2 — Continued 
Plant 

Data for the Heads Pollinated 
Fertility 
(%) 
Total 
No. 
Heads 
Heads 
With 
No Seed 
Heads 
With 
Seed 
Seeds per Head. Remarks 
No. 
5- 
12 
12 
0 
1 
6. 
15 
15 
0 
8. 
10 
10 
0 
9. 
14 
14 
0 
10 . 
10 
10 
0 
II . 
13 
13 
0 
12 . 
10 
10 
0 
13- 
10 
10 
0 
14. 
12 
12 
0 
15- 
1 1 
0 
16. 
10 
10 
0 
AR. Ser. 
5. 
Parentage, AXR. Ser. i, no. i 
No. 
I . 
10 
10 
0 
2 . 
1 1 
1 1 
0 
3- 
4- 
10 
10 
0 
5- 
10 
10 
0 
6. 
10 
10 
0 
7- 
10 
10 
0 
8. 
12 
12 
0 
9- 
12 
12 
0 
10. 
10 
10 
0 
II . 
10 
10 
0 
12 . 
13 
13 
0 
13- 
12 
12 
0 
14. 
12 
12 
0 
15. 
13 
13 
0 
16. 
9 
9 
0 
17- 
18. 
12 
12 
0 
8 
8 
0 
19. 
12 
12 
0 
Table 14) made it somewhat difficult to limit the parentage of the 
various series to the same parents, which would, of course, be highly 
desirable. Thus it happens that the immediate parents of these 
series are not the same as those of the series reported in Table i ; the 
plants involved are, however, closely related sister plants. 
In making the cross-pollinations between the self-sterile parents 
here involved, no attempts were made to emasculate or to depollinate 
the seed parent. In brushing a flower head of a prospective seed 
parent with a flower head from a plant selected for a pollen parent, 
there was necessarily a full and rather thorough mixture of the two 
lots of pollen with apparently an equal chance that both should be 
distributed on stigmatic surfaces. A total of 54 plants were derived 
