THE SMITHSONIAjST INSTITUTION Xni 



ASTROPHYSICAL OBSERVATORY 



Director, — Chaeles G. Abbot. 

 Assistant director. — Loyal B. Aldrich. 

 Research assistant. — Frederick E. Fowle, Jr. 

 Associate research assistant. — William H. Hoover. 



DIVISION OF RADIATION AND ORGANISMS 



Chief. — Frederick S. Brackett. 

 Research associate. — Earl S. Johnston. 

 Associate research assistant. — E. D. McAuster. 

 Research assistant. — Leland B. Clark. 



REGIONAL BUREAU FOR THE UNITED STATES, INTERNATIONAL 

 CATALOGUE OF SCIENTIFIC LITERATURE 



Assistant in charge. — Leonard C. Gunnell. 



