REPORT OF THE SECRETARY 

 INTERNATIONAL EXCHANGE SERVICE 



Acting Chief. — Harry W. Doesey. 

 Acting Chief Clerk.— F. E. Gass. 



NATIONAL ZOOLOGICAL PARK 



Director. — Wiixiam M. Mann. 

 Assistant Director. — Ebnest P. Walker. 



ASTROPHYSICAL OBSERVATORY 



Director. — Loyal B. Aldrich. 



Division of Astroi-hysical Research: Loyal B. Aldrich, in charge; William H. 



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

 Division op Radiation and Organisms : Earl S. Johnston, assistant director ; 



Edward D. McAlister, senior physicist;* Leland B. Clark, engineer (precision 



instruments) ; Robert L. Weintraub, associate biochemist ; Leonard Price, junior 



physicist ( biophysics ) . 



•Now on war duty. 



