Stout & Boas: STATISTICAL STUDIES IN CICHORIUM 441 
limited individual variability is quite in accord with the very 
marked uniformity of vegetative habit. It may be noted that 
the immediate seed parent of the F; series gave a value of a at 
17.7, which was slightly above the average of the series to which 
it belonged. In fact the Е, series (Е» X А)—то— showed а 
tendency to low values, the range dropping to 15.3 (see TABLE 48). 
The values of the F; therefore average somewhat higher and there 
is less variability among individuals. 
Three plants of this Ез series were selected as seed parents for 
the F, generation. The plants of all three series were quite uni- 
form in the vegetative habit of the race, as will be seen in PLATE 
10, to the left, to the foreground, and to the right of field no. 49. 
The series to the right, however, was late in maturing and the 
photograph does not show the mature branching. 
The three Е, series of this race were derived from sister plants 
differing imperceptibly in vegetative habit. In regard to the values 
of a, however, one parent (no. 13) gave the lowest value (17.1) 
of the F;; the other two exhibited values slightly above the average. 
The Е, offspring of the parent selected for lowest value among 
the F; of this line gave a range for values of a of 15.1 to 17.7 with 
an average of 16.4 and a standard deviation of +0.66. The 
mode has shifted to lower values than were seen in any generation 
of ancestry. The range, however, was not extended to values 
lower than some realized in the F» (TABLE 48). 
The characteristics of the other two series were quite identical. 
The range of one is from 16.6 to 19.3, the average 17.8, and stand- 
ard deviation + 0.56, while values for the other range from 16.5 
to 18.4, with an average 17.3 and standard deviation +0.51. 
These values agree quite closely with the average values seen in 
the Ез from which the series descended. Тһе immediate parents 
were only slightly higher. 
The results here obtained demonstrate that pedigreed line 
breeding from different parents of a race which itself appears very 
uniform in the Ез may isolate strains that are slightly different in 
performance, the selection for lowest value especially giving a 
strain in which the range is decidedly shifted. 
F. Characteristics and history of a tall-growing race (race 6). 
This race was isolated or segregated in the Ез generation. In . 
