Stout & Boas: STATISTICAL STUDIES IN CICHORIUM 429 
Capucin was of biparental descent. The summaries for compati- 
son with the immediate parents are given in TABLE 47. The 
values of a for the Е, are from data collected in the third year of 
growth and are averaged for all sister plants of a particular cross. 
TABLE 47 
AVERAGE FLOWER NUMBER FOR FIRST DAY OF BLOOM (а) FOR PARENTS AND THEIR 
Fi OFFSPRING 
FEM " epee Difference between 
жане | parents and off- 
И а | Average а of plants | Average а spring 
| | 
C, 21.7 Е», 23.3 22.5 19 | 2I — I.I 
С, 217 3, 20.7 21.2 IS | 20.0 — 1.2 
А, I9.2 Em, 23.3 21.2 46 | 20:1 — 1л 
21, 10.2 (C31: 20.4 7 | 200 — 0.4 
19.2 Es, 20.7 19:0) (222! 21 | — 19.5 "gae nr 
It is rather striking that while in every case the average of the 
offspring is below that of the average for the two parents, yet the 
higher the average of the parents the higher is the average of the 
offspring. The fact that the average of the offspring is lower than 
that of the two parents suggests that the immediate parents gave 
values that are high for the races involved and that the offspring 
show regression. It will be seen that the difference between the 
average flower number per head of parent and offspring is the 
greater the higher the value of the parents. Accordingly, if one 
used parents with very low flower number, in all probability the 
offspring would give a somewhat higher average flower number 
than their parents. 
Further and more exact comparison of progeny with immediate 
parent can be made in the three main lines of uniparental descent 
constituting the Ез, Ез, and Е: generations. TABLE 48 presents 
such data, indicating the pedigree, the distribution for values of a, 
the variability measured by the standard deviation, the value of a 
for the immediate parent, and the standard deviation of the parent 
series (the series of sister plants to which the particular parent 
belonged). 
A glance down the columns of the frequency distribution shows 
that the three lines of descent present, on the whole, values that 
are rather uniform for each line. А comparison of the values of 
