Date. 



Observation 



— Ephemeris. 



In R. A. 



In Dec. 



d a 



No. of Obs. 



d S 



No. of Obs. 









II 





II 





1846, 



Sept. 



26 



— 0.21 



160 



+ 0.55 



144 





Nov. 



6 



— 0.11 



343 



+ 0.62 



297 





Dec. 



31 



+ 0.95 



90 



+ 0.92 



80 



. 1847, 



April 



6 



+ 0.42 



15 



— 0.18 



16 





August 



22 



— 0.64 



76 



+ 0.19 



71 





Nov. 



8 



— 0.96 



46 



+ 0.77 



51 i 





Dec. 



IS 



— 0.44 



18 



+ 0.89 



18 



1848, 



August 



24 



— 0.71 



72 



+ 0.26 



72 





Nov. 



10 



— 0.27 



21 



— 1.23 



21 



I have accordingly not attempted any change in the elements used as the basis 

 of the Ephemeris for 1849, but have employed those published in June last in the 

 Smithsonian Contributions. As a point of reference to other pubhcations, I 

 would remark that the same elements called the second elliptic elements of Nep- 

 tune were published in the proceedings of the American Academy for April 4th, 

 1848, in the commimication of Professor Peirce. They were reprinted in the 

 Proceedings of the Royal Astronomical Society, vol. viii.. No. 9, page 202. I 

 avail myself of the occasion to acknowledge the kindness of my friend, Dr. Ben- 

 jamin Apthorp Gould, in making known my first elliptic elements of Neptune 

 through his Ephemeris of this planet, published in ^Schumacher's Astronomische 

 Nachrichten, No. 646. Dr. Gould's Ephemeris presents a close agreement with 

 observation. The small modifications of my first elements, communicated to 

 Prof Peirce in my letter of March 6th, 1849, which had not yet reached Dr. 

 Gould, have led to the very satisfactory result already referred to. I subjoin the 

 data used in computing the successive Ephemerides. 



*In No. 628 of that Journal, the eccentricity of Elements I. should read 0.00857741; also x = [9.9998769] rsin (b-|- 

 138° 21' 52". 13. ) The last correction is also required in the Proceedings A. A. S. for Dec. 7th, 1847.— S. C. W. 



