378 



Judge Kane was appointed to prepare an obituary notice of 

 Chancellor Kent. 



Professor Kendall presented a communication from Mr. 

 Walker, containing new elements for the planet Neptune. 



Prof. Kendall communicated the following elliptic elements of the 

 planet Neptune, derived by Mr. S. C. Walker from a discussion of 

 689 observations, including those made by Lalande in 1795. 



Long, of perihelion, 



„ ascending node, 

 Inclination, 

 Eccentricity, 



Mean daily sidereal motion, 

 Epoch, January 1st, 1847, 

 Period, 



i'.93 I 



2.93 \ Mean Equinox of Jan. 

 1st, 1847. 



ir= 48 21 



Q = 130 4 35.1 



i= 1 46 59.54 



e = 0.00857741 



^ = 21. "55448 



M=328° 31' 56" .36 Mean noon, Greenwich. 



r= 164.6181 Tropical years. 



The heliocentric co-ordinates for the mean equinox of January 1, 

 1847, are, — 



ic = [9.9998769]. r. sin (v + 13°8 21 52'] 3) 

 ?/ = [9.96622G5], r. sin («+ 48 55 27.32) 

 z = [9.5800962]. r. sin (»+ 45 2 37.90) 



The four normal places used as the basis of these computations are 

 given below, corrected for parallax, and refraction, but not for plane- 

 tary aberration. They are referred to the mean equinox above 

 mentioned. The perturbations of Neptune by all the other planets, 

 were computed by Prof. Peirce, and have been applied to the elliptic 

 places. 



Mean time, Greenwich. 



Obs. Geo. R. A., 

 „ Dec, 

 True elliptic long., 

 Perturbations, 

 True ell. Rad. Vec. 

 Perturbations, 



iv 



Sr 



1705 

 May 9d.45256 



Computed Geo. R. A. Ji 



Dec. D' 



Corr. Eph., A— A' 



D-D' 



213 39 34.18 

 —11 34 36.21 



215 48 12.73 

 + 3760 



30.28772 

 + 0.01207 



213 39 32"32 

 —11 34 34.89 

 + 1.86 



— 1 



1846 

 Nov. 7d.O 



327 49 50.24 

 —13 34 21.65 



327 13 58.37 

 + 32.10 



29.99441 

 + 0.01608 



1847 

 April 6d.O 



331 49 45.65 

 —12 9 17.82 



328 8 0.93 

 + 31 .29 



29.99042 

 + 0.01497 



327 49 53.16 331 49 44 82 

 -13 34 20.42—12 9 20.47 



- 2.92 + 0.83 



- 1.23+ 2.65 



1847 

 Aug. 22d.O 



331 19 13.71 

 —12 24 7.55 



3.28 57 44.75 

 + 29.49 



29.98677 

 + 0.01493 



33°1 19 13J5 

 —12 24 7.56 

 — 24 



+ 0.01 



Professor Tucker read a paper on "the Association of Ideas," 

 in which, in conformity with his lectures formerly delivered 



