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A. B. Stout, Director of the Laboratories 
D. B. Strickland, Steam Engineer 
F. A. Thumann, Carpenter 
P. Vogel, Laborer 
T. Webb, Laborer 
F. White, Laborer 
Florence M. Willey, Stenographer 
R. A. Willey, Driver 
R. S. Williams, Administrative Assistant 
R. E. Wills, Steam Engineer 
Percy Wilson, Associate Curator 
Wild Flower Preservation Society 
Reports Appended 
Following this report will be found those of the Assistant 
Director, the Head Gardener, the Head Curator of the 
Museums and Herbarium, the Librarian, the Bibliographer, 
the Director of the Laboratories, the Superintendent of 
Buildings and Grounds, the Honorary Curator of the 
Economic Collections, the Honorary Curator of the Col- 
lection of Fossil Plants, and the Honorary Curator of 
Mosses; also a list of subscriptions to the Emergency 
Fund subscribed by members during 1918, and a schedule 
of expenditures by the Bookkeeper. 
Respectfully submitted, 
N. L. Britton, 
Director-in-Chief. 
REPORT OF THE ASSISTANT DIRECTOR 
Dr. N. L. Brirron, Drrector-in-CuIErF. 
Sir: I have the honor to submit the following report for 
the year 1918. 
The growing season of 1918 was quite moist until late 
summer and especially favorable for herbaceous plants 
and evergreens. Many of the latter, however, were 
severely injured by the unusually cold winter, as described 
