37 



of the Perturbations. Each night's work of one observei*, with one instrument, 

 counts as one observation. Meridian observations are used, as pubhshed by 

 their authors in their most recent works. Equatorial comparisons with either 

 of the stars above referred to, are made to depend upon the following catalogue 

 of mean places, derived from No. 44, and are referred to by the appropriate let- 

 ter of the star. 



N(x E. A. C. Mag. Mean R. A., 1847.0 Mean Dec, 1847.0 



7648 7 



9 



9 



9 



7,8 



7722 7 



7740 7 



Where several stars are used in furnishing one equatorial observation, with- 

 out distinguishing the effect of each, it is reduced as published by the observer, 

 without reference to the group of stars, and without being taken into account in 

 forming the normal places. The list which follows, forms, for the interval 

 embraced, the most extensive series of observations yet made on a single planet, 

 and is worthy of the occasion which summoned to active exertion every practi- 

 cal astronomer in the world. With all the pains bestowed upon the computa- 

 tions, some errors may have crept in, for which the author must claim the indul- 

 gence of those observers whose works are here brought together in a common 

 field of view. 



No. 48. The following *table comprises the observations of 1795, 1845, 1846, 

 and 1847, as compared with the Ephemeris : 



* Note by the Secretary, S. I. — The Geneva, Greenwich, Markree, and Oxford observations of 1846, and the Cape 

 of Good Hope, Copenhagen, Christiana, Geneva, Greenwich, Kasan, Kremsmunater, and Petersburg observations, for 

 1847, having been received by Mr. Wallcer since the date of his original paper, (April 10th, 1848,) have been reduced by 

 him, and communicated to the Smithsonian Institution. They are now (May, 1850,) inserted in chronological order for 

 facility of comparison. They have not been used in forming the normal places of No. 46 ; but will hereafter be employed 

 by Mr. Walker, when a further correction of his Elliptic Elements II. shall be needed. — J. H. 



