52 
Mr. Pond on the changes , &c. 
With regard to the catalogue for the present period, which 
accompanies this paper, I beg to state that I consider it only as 
a very near approximation to the truth, and requiring at least 
another year's observations, to render it of equal value with 
that of 1813, which is the result of two years observations 
with six microscopes, and in four positions of the telescope. 
I am persuaded that the more this subject is considered, the 
more distinctly it will appear, that if any doubt can be enter- 
tained, founded on any circumstance arising out of the Dublin 
observations, that doubt must relate, not to the accuracy of 
former catalogues, but to the present position of the stars ; 
since it is with respect to their present position that the two 
instruments are really at variance. This circumstance is very 
fortunate, as time may confirm the present, or suggest some 
more satisfactory method of investigation, if what I have now 
advanced be not thought sufficient for the purpose. 
