ADVERTISEMENT. 



In tlie investigation of tlic Orliit of Uranus whicli forms the subject of the accompanying memoir, 

 as well as in that of the Orbit of Neptune previously published in the Smithsonian Contributions, 

 a large amount of arithmetical computation has been required, especially in the reduction and com- 

 parison of observations. The cost of this, in accordance with the spirit of the Institution in 

 advancing science, has been defrayed from the income of the Smithson fund. 



As required by the rules of the Institution, the accompanying memoir was referred to competent 

 authority for examination, and the persons selected for this purpose were Professor J. H. C. Coffin, 

 of the Nautical Almanac Office, and Professor Asaph Hall, of the Naval Observatory. 



JOSEPH HENRY, 



Secretai-y S. I. 



Wasuingtox, 1873. 



PHn,ADELPHIA: 

 COLLINS, TRINTER, 



705 Jayue Street, 



