REPORT OF THE SECRETARY ix 



Collaborator. — John R. Swanton. 



Editor. — M. BLelen Palmeb, 



Librarian. — Miriam B. Ketchum. 



Illustrator. — Edwin G. Cassedt. 



Institute of Social Anthropology. — G. M. Foster, Jr., Director. 



River Basin Surveys. — Frank H. H. Roberts, Jr., Director in charge. 



INTERNATIONAL EXCHANGE SERVICE 



Acting Chief. — Harry W. Doksey. 

 Chief Clerk. — D. G. Williams. 



NATIONAL ZOOLOGICAL PARK 



Director. — William M. Mann. 

 Assistant Director. — Ernest P. Walkeb. 

 Head Keeper. — Frank O. Lowe. 



ASTROPHYSICAL OBSERVATORY 



Director. — Loyal B. Aldrich. 



Division of Astrophysical Research : Loyal B. Aldrich, chief ; William H. 



Hoover, senior astrophysicist ; Charles G. Abbot, research associate. 

 Division of Radiation and Organisms: Earl S. Johnston, chief; Leland B. 



Clai-k, engineer (precision instruments) ; Robert L. Weintraub, chemist 



(biological) ; Leonard Price, junior physicist (biophysics) ; G, D. Talbert, 



instrument maker. 



NATIONAL AIR MUSEUM 



Advisory Board: 



Alexander Wetmore, Chairman. 



Maj. Gen. E. M. Powers, U. S. Army Air Forces. 



Rear Adm. A. M. Pride, U. S. Navy. 



Grover Loening. 



William B. Stout. 



CANAL ZONE BIOLOGICAL AREA 

 Resident Manager. — James Zetek. 



