SECRETARY’S REPORT 
INTERNATIONAL EXCHANGE SERVICE 
Acting Chief.—D. G. WILLIAMS. 
NATIONAL ZOOLOGICAL PARK 
Director.—WILLIAM M. MANN. 
Assistant Director.—ERNEST P. WALKER. 
Head Keeper.—Franx O. LOwE. 
ASTROPHYSICAL OBSERVATORY 
Director.—LoyaL B. ALDRICH. 
DIVISION OF ASTROPHYSICAL RESEARCH : 
Ohief.—WILLIAM H. HOOVER. 
Instrument makers.—D. G. TALBERT, J. H. HARRISON. 
Research associate.-—CHARLES G. ABBOT. 
DIVISION OF RADIATION AND ORGANISMS: 
Acting chief, in chargé.—LoYAL B. ALDRICH. 
Biologist (biophysicist).—LEONARD PRICE. 
Ohemist.—O. J. WILLIAMS. 
Biological aid (botany).—Y. B. ELstTap. 
NATIONAL AIR MUSEUM 
Advisory Board: 
ALEXANDER WETMORE, Chairman. 
Mags. Gren. E. M. Powers, U. 8. Army Air Forces. 
REar ApM. A. M. PRIDE, U.S. Navy. 
GROVER LOENING. 
WILLIAM B, STOUT. 
Assistant to the Secretary for the National Air Museum.—CarL W, MITMAN. 
Curator.—P. H. GARBER. 
Associate curator.—s. L. BEERS. 
Exhibits preparator.—s. L. POTTER. 
CANAL ZONE BIOLOGICAL AREA 
Resident Manager.—JAMES ZETEK. 
IX 
