Astronomy. 133 
_ Mr. Walker’s important discovery of the identity of Neptune with a 
star observed by Lalande, May 10, 1795, (Vol. iii, ii Ser., p. 441,) 
seems now amply confirmed. An examination of the original obser- 
vations of Lalande, shows that he also observed the body two days 
previous, but as the two observations disagreed, the earlier was reject- 
ed, and the latter marked doubtful. The following communication on 
the subject, by Mr. Walker, appeared in the National Intelligencer, 
(Washington,) of June 4, 1847. 
Gentlemen,—In my letter of May 22d, announcing the confirmation 
of my discovery of the Lalande observation of Neptune, I remark 
that the elements can now be completed, and that the computation of 
Neptune’s perturbations would afford the means of obtaining the pure 
elliptic orbit round the sun from the perturbed orbit presented in ele- 
ments V. ‘i 
Perihelion point, ; : pier ge vie gO 14 82-90 
Ascending node, ‘ ‘ : d . 129 51 13°53 
Epoch, January 1, 1847, . : : 326 Ro oles 
Inclination, : : . -) 45-38.°10 
Eccentricity, . : j : ‘ . 0005052917 
Mean distance, « 3 ‘ . 80-°17775 
Mean daily sidereal motion, ‘ ‘ . | BA 144 
Period in tropical years, . : ‘ . 165y°7175 
Elements VII. are derived entirely from the planet’s recent path for 
nine months. The test of their correctness is, that they should repre- 
