414 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
of the previous season of growth. The plants of the red-leaved 
Treviso variety died at the end of the first season of bloom. 
A perennial plant of chicory grown from seed exhibits consid- 
erable interannual variation in habit of growth, especially in the 
first and second years of growth and bloom. In the first year of 
bloom a single main erect stalk usually develops from the rosette; 
in the second year, usually, several main stalks are produced 
directly from the extreme basal and lower parts of the crown, or 
even from clusters of roots that may or may not have become separ- 
` ated by the death of the basal portions of the stem of the previous 
year. Ina few years the cluster of roots is more or less increased 
in size and number and the group of main branches is correspond- 
ingly increased and more or less crowded together. The degree 
of such development varies considerably. The wild white- 
flowered plant А showed rather feeble increase or spread of this 
sort; the wild white-flowered plant C was somewhat more vigorous 
in its vegetative development; and plants of the Barbe de Capucin 
(E series) were most vigorous in this respect, so that from E; and 
E» in the third year of growth a large number (15 or 20) of stems . 
arose from the roots, and as some of these developed from small 
detached roots they were weak and late in developing. The 
» crowding of such a number of stems also caused the poor develop- 
ment of many of them. For the perennial plants upon which 
data were collected, it has been the policy to allow no more than 
three or four main branches to develop. These were selected 
from the first shoots and were as nearly uniform in development 
as possible; all other weaker or later branches from the root cluster 
were cut away. 
It has already been reported that in the second year of growth 
from seed, plants are taller and more branched and have a much 
longer flowering period with the production of many more flowers. 
These differences in general habit of growth are represented by 
such differences in data as appear between TABLES 8 and 9 for 
example. These differences raise the question whether such values 
as those calculated for the first day of bloom (a) and for the rate 
of decrease (b) are consistent for a plant in the successive years 
of its growth from seed. 
Some judgment of this question may be gained by the correla- 
