stout: pollinations in cichorium intybus 



377 



TABLE 5 — Continued 



{E22 X A) 



-10-13- 



No. 12. 



" 13- 



" 15- 



" 16. 



" 17- 



{E22 X A) 

 -10-14- 

 xNo. 2. 



" 5- 

 " 6. 



" 9- 

 " 10. 



Record for heads pollinated 



Seeds per head 



Fertility 



i (r*) 



2, 8, 9, 10 0.25 



I. 3. 4. 9, 9. II. II, 12, 14. 16, B. .1 0.56 

 II o.oi 



1, 3. 3. 4. 5- 



2, 4, B 



0.13 



O.II 



A glance at this table shows that the families in the third 

 generations exhibit much the same sort of behavior in respect to 

 fertility and sterility as did the preceding generation. No series 

 in which more than two plants were grown was composed of plants 

 all of which were self- fertile. One series, {A X E22)-4-i-, was 

 composed of 10 plants all of which were self-sterile ; {A X E22)-4-j- 

 was composed of 2 self-sterile and 6 self-fertile plants, and {E22 

 X A)-io-i3- had 10 self-sterile and 6 self-fertile plants. Taken 

 as a whole, there were 46 self-sterile and 43 self-fertile plants; 

 48 per cent of the plants were self-fertile in some degree. Of the 

 preceding generation 39 out of 80 plants were self-fertile, a per- 

 centage of 48. In both generations, considered as a whole, the 

 number of self-sterile plants was slightly greater than those self- 

 fertile, but the ratio of the two was the same. 



In respect to the degree of self-fertility exhibited by individual 

 self-fertile plants of this F3 generation, as judged by the seed set in 

 the controlled self-pollinations, there were all degrees ranging from 

 high self-fertility (70 per cent in the plant {A X E22)-g-5- no. 12) 

 to very feeble self-fertility, both in reference to percentage of 

 heads giving seed and to the number of seeds in the heads. On the 

 individual record the different plants exhibit varying degrees of 

 self-fertility quite the same as was seen in the Fi and the F2 

 generations, but with a few plants with a higher percentage. 



