A. B. Stout 73 



The groiqj of sister plants grown from the same plant or from the 

 same cross in any one season is called a series, and in these reports such 

 a group bears the number of the plant that was the immediate parent, 

 together with the numbers in serial order designating the previous 

 parentage. Thus, for example, series {A x E'22) is a generation of 

 plants derived by using pollen of plant E23 on pistils of plant A ; 

 series {A x E32)-.^- is a group of sister plants grown from self- 

 fertilized , seed of the F^ plant (A x E3;2) no. 4. Thus the series 

 (A X E:22)-4--3-ll-, for which data are given in Table II, has had three 

 generations of self-fertile ancestry, of the different series and numbers 

 as designated, which indicate the line of descent from the original cross 

 between A and E'22. Although somewhat cumbersome, this treatment 

 presents a complete record of pedigree, froui which the performance of 

 individuals, of lines of descent as a whole, and of families may be ascer- 

 tained. All the plants of a sub-family will be given the designation of 

 the common ancestor, thus all the descendants of plant {A x E22) no. Jf, 

 may be considered as family (J. x E22')-If.-, and all the descendants of 

 plant (.4 X E22) no. 10 will be designated as family (J. xE22)-10-, hoih, 

 however, being sub-families in the main family {A x E22) but descend- 

 ing from two different sister plants. 



The data in detail for any parents, or for any series referred to, but 

 which were grown previously to 1916, are given in a report already 

 published (Stout, 1916). 



Results of the Experimental Studies. 



1. Performance of a family of Barbe de Capucin x wild 

 white-floivered : the family {E3 x A)-^-. 



In 1916 two series from two generations of self- fertile ancestry were 

 grown in the family (£'-'? x A)-^-. The results obtained from the self- 

 pollinations of these 49 plants are compiled in Table I. Of the 

 23 plants of the series first presented in this table, all but five were 

 self-fertile with percentages of fertility ranging from 4 to 48, and with 

 an average fertility for the self- fertile plants of 20 7 . The percentage of 

 fertility, frequently referred to in this paper, is determined on the basis 

 of the proportion of seeds produced by the flowers involved in the con- 

 trolled pollinations. Of the other series, 16 plants were self-fertile, and 

 10 were self-sterile ; the fertilities of the self-fertile plants ranged from 

 2 to 60 °/^ with an average of 15 /^. 



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