652 SOCIÉTÉ D ACCLIMATATION. 



stars and the corrections necessary to reduce the right as- 

 censions of différent Catalogues to a rnean homogeneous 

 system, by Simon Newcomb. 



Zones of stars observed at the United-States naval observa- 

 tory ivith the meridian transit instrument in the years 4846, 

 1847, 1848 and 1849, by the professors Reuel Keith, Mark 

 H. Beecher, Joseph S. Hubbard, John J. Almy and William 

 A. Parker. 



Remercîments. 



Le Secrétaire du Conseil ', 

 Maurice Girard. 



