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STOUT в Boas: STATISTICAL STUDIES IN CICHORIUM 359 
crossing plants of wild white-flowered chicory and plants of the 
unimproved cultivated variety known as Barbe de Capucin. 
Some study was made of a few plants of the parent stock. The 
wild white-flowered parents (designated аз A and C) were ob- 
tained in the autumn of 1911 from the campus of the University 
of Wisconsin and transplanted to the experimental plots at the 
New York Botanical Garden. In 1912 a crop of plants was grown 
from the open-fertilized seeds of these two plants. Plants of the 
variety Barbe de Capucin were grown in 1912 from seed obtained 
from J. M. Thorburn and Company (no. 4300, catalogue of 1911). 
These plants are designated the E series. All the plants of the 
first crop, of both wild and cultivated strains which were experi- 
mentally tested for self-fertility, were found to be self-sterile from 
physiological incompatibility. Crosses were made involving two 
plants of wild stock (4 and C) and two plants of Barbe de Capucin 
(E; and E»). Some of the F; progeny were self-fertile (Stout, 
I916), and from these several self-fertilized lines of descent have 
now been grown in Fs, Ез, and F, generations and utilized in 
the statistical studies. The greater number of races and lines 
of descent reported later are descended from a single cross between 
a wild white-flowered plant (А) and one of the variety Barbe de 
Capucin (Fos). 
Considerable data were also collected from plants of the inbred 
generations of a salad variety known as improved red-leaved 
Treviso, the seed of which was produced by the firm of Ernst 
Benary of Erfurt, Germany, and supplied by J. M. Thorburn and 
Company. One generation of 50 plants, Е, hybrids between 
plants of red-leaved Treviso and the wild white-flowered plant A 
have also been studied. It should be stated that the seeds for all 
the cultures of chicory here reported have been sown in sterilized 
soil in small pans during the months of December and January, 
the young seedlings were transplanted to pots all properly labeled 
and grown in the greenhouse until the first of April, when they were 
transferred to cold frames. By the middle of May, when planted 
in the field, the plants as a rule have formed vigorous rosettes often 
more than a foot in diameter. With this treatment nearly all 
plants come into bloom in the first year of growth. 
The plants of the Treviso strain, as well as such varieties as 
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