A. B. Stout 83 



parents of the next generation ranged from 7 to 70. Self-sterile plants 

 appeared in every series, and after three generations of ancestry of highest 

 self-fertilities the proportional number of such plants was high. Of the 

 total of 125 plants, 61 were self-fertile. The distribution of individual 

 self-fertilities is decidedly skew. The average fertilities of self-fertile 

 plants is 0-223. 



(c) The family {E22 ^ A)-10-. 



In 1916, seven series were grown in this family. One of these was 

 of the second generation in descent. This series consisted of 15 plants, 

 all but one of which were self-sterile. The fertility of the one self- 

 fertile plant was one of feeble self-fertility. Self-sterility was almost 

 complete, although the plants had two generations of self-fertile parents 

 with fertilities of 51 and 13. 



TABLE V. 



Record of a series having two generations of selffertile ancestry. 



Record for beads pollinated 



Plant with Flower Total With no With FertUity 



pedigree colour heads seed seed Seed per head per cent. 



{E22xA)-10-Ser. II. 10- jr — — — — 0-13 



No. 1 TF 11 11 — — 



„ 3 IF 14 14 — — 



„ 4 IT 10 10 — — 



„ 5 W 7 7 1, 1, 3, 3, 3, 8, 8 0-26 



„ 6 ir 10 10 — — 



„ 7 • IF 11 11 — - 



„ 8 IF 10 10 — — 



„ 9 IF 11 11 - — — 



^ „ 10 IF 12 12 — — 



,, 11 IF 10 10 — — 



„ 12 IF 12 12 — — 



. „ 13 IF 7 7 — — 



„ 14 IF 12 12 — — 



„ 16 IF 10 10 — — 



„ 17 IF 9 9 — — 



The data for the six series of this family, having three generations 

 of self-fertile ancestry, are given in Table VI. As shown in the pedi- 

 grees, the first two series given have the same parentage for the first 

 two generations. The immediate parents of these series were therefore 

 two sister plants, which, it may be noted, were very nearly identical in 

 all vegetative characters, but differed considerably in the degree of self- 

 fertility. From the parent of 15 ""/„ fertility, 16 plants were gi'own and 

 tested for self- fertility. All but two were self-sterile, and those were 



