REPORT OE THE SECRETARY. 23 



on the Indians of that region, and similar work was conducted in 

 Texas under the auspices of the bureau. Researches on Indian music 

 were continued by Miss Densmore, the music of the Papago being 

 studied this year. 



INTERNATIONAL EXCHANGES. 



The work of the exchange service was greatly increased during the 

 past year owing to the resumption of exchange relations with Ger- 

 manjr. The total number of packages of publications handled during 

 the year was 451,471, an increase of 82,099 over the total for the pre- 

 ceding year. The weight of this material was 005,312 pounds, an 

 increase of 108,934 pounds. 



During the year exchanges of publications were inaugurated with 

 the Czechoslovak Republic and with the Polish Government. Ex- 

 change relations will be established with Roumania and Jugoslavia 

 as soon as transportation and other facilities are sufficiently stabilized. 



To the list of countries receiving full sets of United States Gov- 

 ernment documents there was added the Government of Poland, 

 making a total of 57 foreign depositories, while to the list receiving 

 partial sets were added Latvia and the Library of the League of 

 Nations at Geneva, bringing the total number of partial sets up to 39. 



As an example of the value of the exchange service in securing 

 special series of publications in this country for establishments abroad, 

 a set of publications which would tend to make the United States 

 better known in Belgium was obtained from the various Government 

 bureaus in this country and forwarded to the Societe Beige d'Etudes 

 et d'Expansion, at Liege, at their request. 



NATIONAL ZOOLOGICAL PARK. 



That the National Zoological Park is becoming more and more 

 valuable to the people of Washington and out-of-town visitors from 

 all parts of the country as a source of recreation and natural history 

 instruction is evident from the fact that the record of attendance 

 has again been broken during the past year. The previous year's 

 visitors numbered 2,229,605, which figure was this year exceeded by 

 171,232, making a total of 2,400,837. One hundred and twenty-four 

 schools and classes, numbering 13,629 individuals, visited the park 

 during the year for instruction purposes. The number of animals 

 exhibited to the public is greater than any time since 1912, while the 

 number of species represented in the collection is greater than ever 

 before. The scientific importance and monetary value of the collection 

 also are much greater than in any previous year. Gifts of animals 

 during the year numbered 178, including many rare and valuable 

 specimens. Mr. Isaac Ellison, of Singapore, presented the park with 



