36 REPORT OF THE SECRETARY. 



distribution of exchanges for that country, have been resumed. The 

 Prince of Bulgaria, in response to a request of the Institution, has 

 designated the Scientific Institutions and Library of Sofia to act as 

 the exchange intermediary between Bulgaria and the United States. 



As Hawaii, the Philippine Islands, and Porto Rico are under the 

 jurisdiction of the United States, the Institution feels that exchanges 

 with them can no longer be termed " international," and has therefore 

 discontinued the acceptance of packages from domestic sources for 

 these territories. 



The International Exchange Service, in its efforts to aid the Cali- 

 fornia Academy of Sciences in the rehabilitation of its library and 

 collections, destroyed by the earthquake and fire of April, 1906, sent 

 circulars to all the foreign correspondents of the academy soliciting 

 contributions. I am gratified to state that a most liberal reponse has 

 been made, the number of exchanges received aggregating 6,370 

 packages and publications, which were forwarded to San Francisco. 

 It may be noted in this connection that this is the first time since its 

 organization that the Exchange Service has sent out a circular of this 

 character in behalf of any establishment. 



NATIONAL ZOOLOGICAL PARK. 



By act of Congress approved April 30, 1890, the National Zoolog- 

 ical Park was established " for the advancement of science and the 

 instruction and recreation of the people," and in pursuance of this 

 authorization the collection of living animals has increased from year 

 to year, it being the purpose to exhibit living species of the various 

 types of animal life for the instruction and entertainment of the 

 public. 



In carrying out the first of the objects stated in the act of organ- 

 ization, namely, the advancement of science, the original design con- 

 templated the establishment of methods of scientific research, but lack 

 of means, and the more important necessities of the park, have pre- 

 vented this from being realized. Plans for a laboratory are in hand. 

 The varied zoological collection now assembled affords material of 

 great value for studying the habits of animals, and for physiological 

 and pathological research, subjects of practical importance and 

 utility. 



Much care and attention has also been devoted to preserving the 

 natural beauty of the surroundings and to the enhancing of the 

 attractiveness of the park to visitors. 



With a single exception, no especial appropriation has been made 

 for the erection of buildings for the animals in the park since its 

 inception. They were originally housed in wooden sheds which have 

 been gradually replaced by fireproof structures, as the appropriations 



