1922] Setchell-Goodspccd-Clauscn: Nicotiana Tabacum 477 



sented on plate 68. In the 25 plants of 12F3H,PoPi8, the height, 

 habit, flower shape, and flower color were close to, if not identical with, 

 those of the Fo parent. As respects leaf base characters, li were 

 LATiFOLiA of type 6, 4 had long, naked petioles, 3 had short, naked 

 petioles, 1 had a long, winged petiole, and 4 were auriculata plants 

 nearly of type 10. This seems like a considerable segregation, but the 

 leaves are of only two generic types, viz., petiolate and non-petiolate. 

 In subsequent generations selection was made in one line for latifolia 

 leaves of type 6, and in the other for auriculata leaves of type 10, 

 called type 6a to indicate its derivation. 



Of type 6 as thus established 100 plants of F^ were grown in 1914; 

 100 plants of F,- (50 each from 2 different parents) in 1915; 20 plants 

 of Fg in 1915; and 20 of F^ in 1916. All the individuals thus grown 

 were constant to latifolia of type 6 as originally selected. 



Of auriculata of type 6a, similarly, 100 plants of F^^ were grown 

 in 1913 ; 94 of F^ in 1914 ; 20 of F„ in 1915 ; and 20 of F, in 1916. All 

 these plants were uniform and true to auriculata of type 6a, very 

 close to AURICULATA of type 10. In both these types we have definitely 

 obtained stable recombinations of germinal elements exhibiting char- 

 acters different from those of the parents. 



F3 of type 7, I2F3H2P13P48 (cf. pi. 69), consisted of a family of 

 25 plants, all vigorous except one (P17), which was set out in the field 

 later and developed into a "runt," as often happens with such later 

 plantings. All the plants agreed well with one another in height and 

 habit except the "filler," and all agreed in inflorescence, flowers, and 

 leaves. There were some variations in size and lobing of the limb of 

 the corolla, indicating possibly minor segregation, but in all general 

 characters there was uniformity to a large degree. The plants agreed 

 well in all characters with the Fo parent, and also with the F^ parent. 

 The color of the flower was light pink, the petioles of the leaves varied 

 somewhat in length, were distinctly and more or less broadly winged, 

 and the blade was heart-shaped, at least at the base in the lower leaves. 

 In all respects these characters were no more variable than they were 

 found to be in F^. 



Type 7 continued to breed true in subsequent generations. It was 

 grown in 1913 (100 plants, FJ, 1914 (2 families of 50 plants each, 

 F,), 1915 (10 plants, F J, and 1916 (10 plants, F,). All were uni- 

 form as to leaf and flower color. Type 7 is very close to the type of 

 Fj and to type 6 described above. It, too, evidently represents a stable 

 recombination of germinal elements derived from both parents. 



