REPORT OF THE SECRETARY. 31 
cluding the Athapascan, Tlingit, Haida, Chinook, Algonquian, 
Siouan, and Eskimo. . 
The third of the series of handbooks is in preparation. This will 
be a Handbook of American Antiquities. Work is also in progress on 
a Handbook of Aboriginal Remains East of the Mississippi, and it is 
proposed later to put in hand a series of handbooks of the Indians 
of the several States. 
Publications issued during the year included a bulletin on Chip- 
pewa Music and one on the Ethnozoology of the Tewa Indians; 
those in press at the close of the year were the Twenty-ninth, Thir- 
tieth, and Thirty-first Annual Reports, besides four bulletins. There 
was distributed a total of 12,819 volumes or separate papers. ‘The 
library of the bureau now numbers about 20,000 books, 13,000 
pamphlets, and several thousand unbound periodicals. For the 
proper care of the library, steel bookstacks have been installed in 
the large hall on the first floor of the Smithsonian building. 
INTERNATIONAL EXCHANGES. 
Soon after the organization of the Institution there was created 
what is known as the International Exchange Service for the inter- 
change of publications between the scientific and literary societies 
in the United States and other parts of the world. The mutual ad- 
vantages of this system to all countries concerned has been reviewed 
from time to time, and I will not attempt to state them again here. 
During the past year there was handled by this service a total of 
341,667 packages weighing 566,985 pounds. The weight of out- 
going material was 424,481 pounds, and of incoming 142,504 pounds. 
Fifty-six sets of official publications of the United States Govern- 
ment are sent abroad in exchange with other Governments and form 
about half of the total weight of shipments, although the receipts 
from that source are comparatively small. In Appendix 3 will be 
found details of the general operations of the Exchange Service 
including a list of foreign bureaus or agencies through which ex- 
changes are transmitted. 
NATIONAL ZOOLOGICAL PARK. 
In establishing the National Zoological Park in 1890, “ for the ad- 
vancement of science and the instruction and recreation of the peo- 
ple,” Congress placed its administration in the Board of Regents of 
the Smithsonian Institution. The collection in the park is the out- 
growth of a small number of living animals which for several years 
had been assembled in very crowded quarters near the Smithsonian 
building mainly for the purposes of scientific study. Chiefly 
through gifts and exchanges the size of the park collection has grad- 
