LETTER 



FEOM 



LIEUTENANT C. H. DAVIS, 



SUPERINTENDENT OF THE NAUTICAL ALMANAC, 



TO 



JOSEPH HENRY, LL.D., 



SECRETARY OP THE SMITHSONIAN INSTITUTION. 



Cambridge, May 1st, 1851. 

 Dear Sir: 



With the permission of the honorable Wm. A. Graham, Secretary of the 

 Navy, I have the pleasure of transmitting to you for publication in the Smith- 

 sonian Contributions, Mr. Sears C. Walker's Ephemeris of the planet Neptune 

 for 1852, prepared for the Nautical Almanac. 



The following table of the perturbations of Neptune from 1854 to 1860 has 

 been computed by Mr. F. W. Ebener, now an assistant in the preparation of 

 the Nautical Almanac, and revised by Mr. Walker. 



Very respectfully, 



Your ob't serv't, 



CHARLES HENRY DAVIS. 

 Joseph Henry, LL.D. 



