STOUT & Boas: STATISTICAL STUDIES IN CICHORIUM 361 
for first 20 days of bloom), and 95,000 in 1916, making a grand 
total of about 233,500. The total number of individual flowers 
counted during the four years is about 4,200,000. 
The collection of these data has taken much time and has 
involved the codperation of several persons, as follows: In 1913, 
Dr. Joseph C. Gilman and Mr. Allen C. Fraser assisted the senior 
author of this paper in the collection of data. In 1914, Miss 
Friedolina C. Jud and Mr. Allen C. Fraser assisted the joint 
authors of this paper. In 1915, Miss Jud and Mr. R. C. Faul- 
wetter assisted the writers. In 1916, Mr. M. V. Reed assisted 
during the months of July and August. In 1914, 1915, and 1916, 
Mr. Charles Holste, who was gardener in charge of the experimen- 
tal plots, frequently assisted, especially when the work was press- 
ing. Dr. Gilman in 1913, Mr. Fraser in I914, Miss Jud and Mr. 
Faulwetter in 1915, and Mr. Reed in 1916 were recipients of 
scholarship grants from the Garden. In July, 1914, Miss Boas, 
joint author in the production of this paper, became a member of 
the Garden staff and took charge of the compilation and special 
methods of statistical treatment of the data. Miss Boas has 
made all the computations involved in this report and has assisted 
very materially in the search of literature. For the greater por- 
tion of the text, for critical discussions of literature; for discussion 
of results, and for opinions expressed in this paper the senior 
author is responsible. 
Special care has been taken to insure uniform methods in the 
collection of data and the persons assisting collected from the 
same plants continuously at least during the period of their co- 
operation. 
The somewhat laborious work of collecting such a large amount 
of data has been possible only through the hearty coóperation of 
the persons above mentioned. The authors wish here to express 
their appreciation of this coóperation and of the support of Dr. 
N. L. Britton, Director-in-Chief, in granting the scholarships as 
noted. 
