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REPORT OF THE ASSISTANT DIRECTOR 
Dr. N. L. Brirron, Drrecror-1n-CHIEF, 
Sir: I have the honor to submit the following report for 
the year 1913. 
The details of maintenance are chiefly outlined in the 
various reports to follow. I submit herewith for your files 
a complete report of the principal work done in each depart- 
ment during the year, made up from weekly reports to me 
by heads of the departments. 
A special effort has been made to eradicate as far as 
possible the hickory bark beetle and the hemlock borer. 
A number of trees known to be infected were cut and burned 
and the stumps barked. A new cactus pest has been kept 
in check by continued disinfection and careful quarantine. 
Publications 
JOURNAL 
The Journal has been published for each month during 
the year, making a volume of 230 pages, with 20 plates. 
Myco.Locia 
This periodical has appeared on alternate months during 
the year, making a volume of 329 pages, with 33 plates and 
1 figure. 
NortH AMERICAN FLora 
Volume 15, part I, was issued June 14, and Volume 15, 
part 2, on August 8. These two parts contain descriptions 
of mosses, including Sphagnaceae—Leucobryaceae, by Albert 
L. Andrews, Elizabeth G. Britton, Julia T. Emerson, and 
Robert S. Williams. 
Volume 22, part 5, containing descriptions of Rosaceae, 
by Per Axel Rydberg, appeared December 23, 1913. 
BuLLeETIN 
Bulletin no. 29, with 82 pages, was issued March 18, 
1913. It contains the annual reports of the Director-in- 
Chief and other officers for the year 1912. 
