OF THE OBSERVATORY OF HARVARD COLLEGE. 303 
Between 22° and 30°, — 
A.—J.2= —0"%19 (Direct comp.) 
M. — A. (mean) — 0".08 (Miidler.) 
whence 
M. — J. 2 — 0.27 
A direct comparison between M. and J. 2 gave also, 
Dec. M. — J. 2. 
40 — 50 ume | 17 stars. 
50 — 70 +0.1 9 « 
agreeing as well with the above table as was to be expected. 
The new Transit Circle at Greenwich seems to give results within our limits pretty 
nearly in accordance with the Mural = used during the years 1812-1851. At 
least we find: — 
Mis iii Obs. No. Comp. 
o o T 
CIELO + 0.95 12 
40 — 50 — 0.04 16 
ij 60 — 0351 H 
The first number differs slightly from the corresponding mean from Mádler' table; 
the others are in almost perfect accordance. I have therefore employed the same 
systematic correction for Ai. 2 as for Ai. 
A cursory examination of Oudemans's table (Diss. Astro., p. 112) showed that the 
few declinations taken thence might be used without sensible error, as harmonizing 
with Madler’s positions. To these positions, weights varying from 2 to 6, according to 
the number of observations, have been assigned. The probable error of the assumption 
M. — Ou. is likely to be quite equal to that of a position given by Oudemans. 
Wolfers, in the Tabule Reductionum, shows that for the fundamental stars s outh 
of 49? included in his Catalogue, Pond's positions corrected by Olufsen agree with 
the determinations given in the Tabule ; Mádler's positions, which are reduced to 
Pond, after correcting the latter in a somewhat similar manner, will be found also 
nearly accordant. 
'The magnitudes in parentheses are derived from Catalogues where no informa- 
tion is given regarding the method pursued in obtaining them. 
The Right Ascensions to seconds have been taken from the British Association 
Catalogue. The initials of the Catalogues have already been explained. The numbers 
in parentheses in the column ** No. Obs." refer to the differential observations of Oude- 
mans. The last two columns contain the Annual Precession for 1859 and Proper 
Motion in Declination; the latter taken, in order of preference, from Mádler and 
the British Association Catalogue. 
