74 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1956 



of Artificial Earth Satellites under the above panel ; associate editor 

 of the Astronomical Journal ; and member of the Panel of the Atmos- 

 phere of the Scientific Advisory Board to the Air Force. 

 Eespectf ully submitted. 



F. L. WnnrLE, Director. 

 Dr. Leonard Caemichael, 

 Secretary, Smithsonian Institution. 



