7 6 
Dr. Brinkley on the 
the differences is o",i north, a remarkable confirmation of the 
exactness of the annual variations used. 
Column 2, of Table V., shows how much the observed 
places, 1823, are north or south of their places, computed 
from the Catalogue of 1813. These results are mentioned 
before, and are only placed here to be seen at one view with 
the rest. 
It has been supposed, that Mr. Pond’s Westbury observa- 
tions afford a confirmation of the southern motion. Column 
3, of Table V., shows how much the observed places, at 
Greenwich, 1813, are north or south of the places predicted 
from the Westbury Catalogue. 
Column 4 contains Mr. Pond’s differences between his 
Catalogue, 1823, and the places predicted from his Catalogue, 
1813. A comparison of Columns 3 and 4 will show, that 
the Westbury Catalogue is, in many instances, so irregularly 
at variance with the Greenwich Catalogues of 1813 and 1823, 
that no conclusion whatever can be deduced from it. 
In the Conn, des Terns. 1809, p. 458, are given declinations 
of four stars observed by Mechain, with the repeating circle 
of Borda, which, at first sight, may appear to support the 
southern motion. 
The first of these stars is Capella, N.P.D. 1800, 44°i3 , i8",o. 
The zenith distance of this star, observed at Greenwich by 
General Mudge with the zenith sector, and reduced to 1800, 
is 5 0 41' 5 i // ,o -f- 9 / ,2. Hence the co-lat. of Greenwich 
= 38° 31' 17", 8. Therefore, either the zenith sector, or 
Borda’s circle, must have been in error ; and had we not proof 
of the exactness of the sector, we could scarcely hesitate be- 
tween the two instruments. 
