A. B. Stout 87 



rather feebly self-fertile. Of the 17 plants derived from {E^2 x A)-10-8- 

 110. 15, all but 3 were self-fertile. The difference in self-fertility seen in 

 these series is most marked, especially in respect to the number of 

 plants self-fertile. Results in such individual cases as these seem 

 to indicate that selection may be effective in increasing or decreasing 

 the development of self-compatibilities. 



The next three series recorded in Table VI were all descended from 

 the plant {E2'2 x AyiO- no. 13, which had a fertility of 38%. The 

 immediate parents of the three series had fertilities of 29, 25, and 56. 

 Of series {E.12 x A)-10-13-o-, m a total of 31 plants, 21 were self- 

 sterile. The fertilities of the 10 self-fertile plants were low, giving an 

 average of 10 " j ^ and a range extending only to 28 %. Considering the 

 record of the line of parentage, with j)ercents of 51, 38, and 29, and the 

 series in the line of descent, the fei'tility of this series is decidedly low. 



The ancestral record for series {E2:3 x A)-10-13-12- is quite iden- 

 tical to that for the series just noted. Of the 23 plants in the series, 

 15 were self-sterile. The fertilities of the self-fertile plants ranged to 

 42°/„, but the average was 16°/„. This is also a low performance con- 

 sidering the parentage. 



Of the 28 plants of series {E22 x A)-10-13-13-, exactly half were 

 self- fertile with percentages that extended to 58 and an average of 19. 

 There has been, perhaps, no series grown with a more highly self-fertile 

 ancestry. Here the selections have been from parents with percentages 

 of 51, 88, and 56. Yet half of the series was self-sterile, and only one 

 plant exhibited a percentage of self- fertility higher than 33. 



The 7 plants of series {E32 x A)-10~14-6'- were derived from an 

 ancestry with fertilities of 51, 14, and 13. Only one plant was self- 

 fertile with a percentage of 10. 



A summary of the ancestral records of the various lines of descent 

 shows that although the various parents exhibited a considerable range 

 in fertilities, the larger series and the greater number of plants in the 

 family have an ancestry of rather high fertilities. The results in 

 summary emphasize the irregular heredity and the continual sporadic 

 or ever-sporting nature of self-fertility and self-sterility in chicory. Of 

 the 196 plants descended from the highly self- fertile plant (E22 x A) 

 ~no. 10, a total of 118 were self-sterile. The percentage of plants self- 

 fertile is therefore 40. The distribution of the self-fertile plants on the 

 basis of percentages is decidedly skew. Much the greater number of 

 plants are feebly self-fertile, and the average fertility of all plants self- 

 fertile is 0-185. 



Journ. of Gen. vii 7 



