Smithsonian Institution, Jlpril, 1850. 

 This Ephemeris of the planet Neptune was prepared for the Nautical Almanac, but appears this 

 year again among the Smithsonian Contributions, by permission of the Hon. Wm. Ballard Pres- 

 ton, Secretary of the Navy. 



JOSEPH HENRY, 



Secretary of the Smithsonian Institution. 



CHARLES HENRY DAVIS, Lieut., 



Superintendent oj the JVautical Almanac. 



