82 Fertility in Oichorium iiitybus 



all self-fertile plants was 14%. This sub-family therefore is one of 

 rather low self-fertility. The parents have all been somewhat above 

 the average of self- fertility, and that of the second ancestral generation 

 was much higher than the average. 



Data for the three series of the third filial generation derived from 

 the plant {A x E22)-0- no. 5 are given in Table IV. The immediate 

 parent of one series was selected for low self-fertility ; the parents of 

 the other two were selected for high self-fertility, one in fact having the 

 highest percentage of any plant thus far utilized in the cultures as 

 a seed parent. 



Of series {A x E'2'2)-9-'')-l-, only four plants were grown, of which 

 one was very feebly self-fertile. 



Twenty-nine plants were gi-own and tested in series {A x E2J)-9~j-6-. 

 Seventeen were self-sterile ; twelve were self-fertile. As further shown 

 in Table IV, the individual fertilities were below 30 7o . except for two 

 plants. One of these was 42 "j^ self-fertile, and the other gave the 

 percentage of 77, which is the highest thus far realized in any of the 

 cultures. The line of parentage has been one of rather high fertility, 

 being 23, 33, and 46, and the series to which the parents belonged have 

 given high values for average fertility (38 and 29). E.xcept for the one 

 highly self-fertile plant regression has been very decided in this series. 



The series {A x E3:'J)-9—5-12- is of .special interest, for the imme- 

 diate parent was one of 70 °/„ self-fertility, the ancestral record being 

 23, 33, and 70. The series is also the largest of any thus far grown in 

 the.se families. Of the 34 j)lants, exactly half were self-fertile. The 

 fertilities range to 66 7o' ^'^d are somewhat more evenly distributed 

 than is usual. The average of the self- fertilities is 28 °/„. A comparison 

 of the data for all the various series (Table VII) shows that, on the 

 whole, this series is one of high fertility. However, half of the plants 

 were self-sterile, a large number of the self-fertile plants were feebly 

 self-fertile, none of the self-fertile plants were more self-fertile than the 

 immediate parent, and the average is below that for any one of the line 

 of self-fertile parentage. Still the fertilities of the two series as a whole 

 are decidedly greater than that of the three series (Tables III and VII) 

 derived from (A x E22)-9- no. 4.. 



Considered as a whole, this family has been grown from parents 

 selected for high self-fertility. With the exception of one series of four 

 plants, no series had any parent of less than 17% self-fertility. The 

 value for the first parent in line of descent was 23 ; the values of the two 

 parents of the next generation were 43 and 33 : and the values for the 



