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southeastern states and devoted some time to the local 
flora. He gave one lecture in the regular Garden lecture 
course. 
Dr. H. H. Rusby, Honorary Curator of the Economic 
Collections, continued to develop the collections of the 
Economic Museum. See his report. 
Mrs. N. L. Britton, Honorary Curator of Mosses, con- 
tinued, with the codperation of Mr. R. S. Williams, Ad- 
ministrative Assistant, to develop the moss herbarium. 
See her report. 
Dr. Arthur Hollick, Honorary Curator of Fossil Plants, 
continued in charge of the paleontological collections. 
See his report. 
The writer, in addition to general and special curatorial 
duties, devoted some time to monographic work on North 
American Flora. Exploration in Florida was carried on in 
hitherto botanically unknown regions and special attention 
was devoted in the field to certain groups of plants, such 
as the cacti, the palms, the flowering air-plants, and the 
ferns. 
Respectfully submitted, 
oun K. SMALL, 
Head Curator of the Museums and Herbarium. 
REPORT OF THE LIBRARIAN 
Dr. N. L. Brirron, Drrector-1n-Culer. 
Sir: I have the honor to submit the following report for 
the year 1917. 
The census taken at the end of the year shows 28,534 
bound volumes, a net gain of 895 over the census of a year 
ago. 
During the year 545 books have been bound, including 
34 which are the property of Columbia University. 
The accessions have been listed as usual in the Journal. 
These include 110 books acquired by purchase and 151 by 
gift. The exchanges and deposits number 128, while there 
have been permanently recalled by Columbia 29 volumes. 
