4,2*2 * Mr. Pond on the Declinations 
of all error, except that arising from defect in the divisions of 
the intrument, I was desirous of comparing them with the 
observations made by others ; and I have subjoined a com- 
parison of them with all those which I could procure, that 
seemed entitled to confidence. In the first column are the 
observations made at Greenwich, as published in 1802 by 
the Astronomer Royal ; the second column contains a cata- 
logue deduced from some observations made at Armagh with 
a very large equatorial instrument constructed by Mr. Trough- 
ton. In the third column are the observations of Mr. Piazzi, of 
Palermo; and in the fourth those made at Westbury. All the 
above mentioned observations are arranged in the order of their 
polar distances, and the positive deviations separated from the 
negative ; that the cause of error in any of the instruments 
may be the more easily detected, as likewise any mistake in 
the assumed latitudes of the respective places of observation. 
A general catalogue is then added ; which is deduced, by 
taking the mean, generally of the above four; but in some 
places, a few detached observations that I have accidentally 
procured of other circular instruments have been included. 
The utility of this investigation is not merely confined to the 
determination of the polar distances of the stars ; as besides 
this some valuable information on other points may be ob- 
tained. In the first place, upon examining the variations that 
appear in these observations a question naturally occurs, whe- 
ther, by changing the assumed latitudes of the respective 
places of observation, a nearer coincidence might not be ob- 
tained. And I find, that to make th£ positive deviations equal 
to the negative, the following corrections should be applied to 
the co-latitudes. 
