REPORT OF NATIONAL MUSEUM, 1921. 23 
PUBLICATIONS. 
The publications of the year comprised 9 volumes and 60 separate 
papers. The former consisted of the Annual Report of the Museum 
for 1920 and Bulletins Nos. 106 (plates), 109, 110, 111, 112, 115, 
116, and 117. 
Of the 60 papers issued in separate form, three were parts of volume 
1 of Bulletin 100; one part of Bulletin 104; one part of volume 20, 
three of volume 22, and one of volume 23, “Contributions from the 
United States National Herbarium”; while five were from volume 
57, twenty-nine from volume 59, and seventeen from volume 59 of the 
Proceedings. 
In addition to the Museum publications, many contributions based 
on material in its collections were printed by other bureaus of the 
Government. All of the publications above referred to are cited 
in the bibhography forming part of this report. The editorial office, 
besides supervising the printing of the Museum publications, also has 
charge of all miscellaneous printing and binding. 
The distribution of volumes and separates to libraries and indi- 
viduals on the regular lists aggregated 75,546 copies, in addition to 
which some 13,367 copies of the publications of last and previous 
years were supplied in response to special applications. 
LIBRARY. 
The library of the Museum is assembled almost exclusively with 
reference to the working up of the collections, and embraces a wide 
range of subjects in the sciences and arts, owing to the exceptional 
diversity of the specimens. The main library is housed in the Natural 
History Building, while the publications on the useful arts are pro- 
vided for in the Arts and Industries Building. Moreover, each of 
the divisions and principal offices has its own sectional library, con- 
sisting of the books relating wholly to its subject, which are with- 
drawn from the main branches and so distributed in order to facili- 
tate the progress of the work. The use of the library and its sections 
is not, however, restricted to members of the staff, being extended 
to all properly qualified persons, and this privilege is extensively 
availed of by the Government scientific bureaus and other establish- 
ments in Washington. 
The increment during the year, largely obtained through gift and 
exchange, amounted to 2,041 completed volumes and 2,719 pamphlets, 
increasing the number of books in the library to 150,067, of which 
58,658 are bound volumes and 91,409 pamphlets and unbound papers. 
The most important single acquisition to the geological section 
of the library since the foundation of the department in 1880 was 
received this year in the gift through Mrs. Francis D. Cleveland of 
