416 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
TABLE 34 presents the correlation of data for first and second 
year of blooming for 44 plants; the coefficient of correlation is 
+0.68. TABLE 35, involving 26 plants in the first and third 
years of growth, shows a coefficient of correlation of +0.68. The 
values of a from 50 two- and three-year-old plants show a coeffi- 
cient of correlation of +0.60 (TABLE 36). 
The values for the coefficient of correlation are remarkably 
uniform, which may be considered as more significant than the 
particular value. The correlation is also high, which, with the 
distribution in the tables, indicates very clearly that plants which 
exhibit a high value for a one year will also give high values in the 
following years. The value for a is strongly individual and tends 
to remain quite constant from year to year in spite of such dif- 
ferences as exist in the growth of plants in successive years. At 
least such is the case when the data used in the calculations are 
collected as described from plants grown as the chicory plants 
have been. 
It should be pointed out that the plants utilized in this com- 
putation belong to a small number of lines of descent and that 
they are for the most part Е, Е», and Ез progeny of crosses in- 
volving the wild white-flowered plants (A and C), and those of 
the cultivated variety (E; and Е»). The parents were widely 
different in general habit and the Е, and Е, generations likewise 
exhibited wide variations in such characteristics as height, vigor, 
general habit of branching, and period of blooming. The popu- 
lation as grouped in TABLES 34-36 is composed of five lines of 
descent. If these lines of descent showed great differences in 
flower number, the correlation from year to year would appear 
greater than it really is. From TABLE 37, however, it is evident 
that for plants of the same age the distribution of flower number 
in the different lines is essentially the same. In this table the 
frequencies of occurrence of flower number are recorded for each 
line separately. The interval used in grouping the flower number 
is 0.3; that is, the group 16.0 —.2 includes 16.0, 16.1, and 16.2. 
TABLE 37 shows data for different lines of plants in the first, 
second, and, third years of growth. It will be seen that all the 
lines overlap. The series (E; X А) —4—, an Е» generation, is 
the only one that shows in the first and second year one plant with 
