SECRETARY'S REPORT 9 
and estimates of planning costs are in progress. During the year 
341 specimens in 56 separate accessions were added to the aeronautical 
collections, including an early example of a German one-man heli- 
copter, a DM-1 delta-winged glider of World War II, the Jupiter 
“C” missile and the recovered nose cone of the Jupiter “C,” the “Data- 
Sphere” (a recovered instrumented capsule from a long-range ballistic 
missile), and a large quantity of documents and memorabilia pertain- 
ing to the pioneer rocketry research by Dr. Robert H. Goddard. 
National Zoological Park.—The Zoo accessioned 1,286 animals dur- 
ing the year. The net count at the close of the year was 2,384. Note- 
worthy among the additions were a herd of 14 reindeer from Kotzebue, 
a trio of Rocky Mountain goats and 5 pronghorns, 6 albatrosses, the 
first Dall sheep ever to be exhibited in an American zoo, and a pair of 
Pallas’s cats. A female wisent was born in captivity. 
Canal Zone Biological Area.—About 400 persons visited the island 
during the year, including 54 scientists, students, and observers using 
the station’s facilities for special researches, particularly in plant 
and insect studies, wildlife observation, nature writing, and 
photography. 
International Exchange Service——As the official U.S. agency for 
the exchange of governmental, scientific, and literary publications be- 
tween this country and other nations, the International Exchange 
Service handled during the year 1,129,476 packages of such publica- 
tions, weighing 767,389 pounds. 
National Gallery of Art.—The Gallery received 370 accessions dur- 
ing the year, by gift, loan, or deposit. Eight special exhibits were 
held, and 27 traveling exhibitions of prints from the Rosenwald Col- 
lection were circulated elsewhere. Exhibitions from the “Index of 
American Design” were given 43 bookings in 17 States and the Dis- 
trict of Columbia, and 1 in Germany. More than 40,500 persons 
attended the general tours conducted by Gallery personnel, and more 
than 11,500 attended tours, lectures, and conferences by special ap- 
pointment. The Sunday afternoon auditorium lectures drew 14,500 
persons. The Sunday evening concerts in the east garden court were 
continued. 
Library.—The library received a total of 52,669 publications during 
the year, and 159 new exchanges were arranged. At the close of the 
year the holdings of the library and its branches aggregated 982,596 
volumes, including 586,722 in the Smithsonian Deposit at the Library 
of Congress but excluding unbound periodicals and reprints and 
separates of serial publications. 
Publications.—Highty-one publications appeared under Smithso- 
nian imprint during the year. (See Report of Publications, p. 224, 
for full list.) Outstanding among these were: “Studies in Inverte- 
