A. B. Stout 109 



shifting bags, and tagging heads. Bags need to remain enclosing a 

 group of branches for only 24 hours. By beginning on the first or second 

 day of bloom and shifting a bag about three times, about 30 flower heads 

 per plant can readily be selfed during the first ten days of bloom. 



The /i generation. 



Tests for self-compatibility were made for 351 plants of the I^ genera- 

 tion which were grown from the self-fertilized seed of 3 self-compatible 

 plants. The presentation of data for all these plants would involve rather 

 extended tables, hence complete data will here be given only for certain 

 self-compatible plants which are fully representative of the results 

 obtained, and illustrate the range in the percentages of self-compatibility. 

 In the following tables dates of pollination and number of seed per head 

 are given. The period of bloom is given for the I 2, but for the I^ the 

 last dates of blooming were not recorded. The percentage fertility for 

 all plants of the /j and I2 is based on the proportion of flowers (estimated 

 at 20 per head) which produced seeds, and the percentages for the few 

 self-fertile plants obtained previously are here also thus determined. 

 A general summary showing distribution according to the degrees of 

 self- fertility is given in Table IV (p. 115). 



Series R 12-11- . The immediate parent of this series was one of 

 evidently high self-fertility (1917, Table I). It was, however, the only 

 one of 18 sister plants which was found to be self-compatible. Of this 

 series 35 plants were self-incompatible and 26 were self-compatible. 

 Data for 8 of the latter are given in Table I (p. 110). 



Series R 10-8- . The 177 plants of this series were grown fi-om the 

 selfed seed of a plant {R 10, no. 8) whose self-compatibility is here esti- 

 mated at 55 °/^. This plant was the only one of 10 sisters to set seed 

 to selfing. Of the series, 128 plants were completely self-incompatible 

 and 49 were self-compatible. The fertilities ranged to 42 °/^ . 



Series R 9-3^- . The immediate parent {R 9, no. 34) was one of 

 25 sister plants three of which were self-compatible. Controlled self- 

 pollinations were made on 113 of the progeny: 81 were self-sterile and 

 32 were self-fertile with fertilities ranging to 43 % • ^^ ^^i^ series there 

 were also 40 plants which were highly mpofen^, a condition discussed later. 



The I2 generation. 



The number of plants tested for self-compatibility in this generation 

 was 471. The number of flower heads tagged for autonomous selfing 

 was 14,390 ; the average per plant was 30 flower heads or about 200 



