498 Dr. Brinkley's remarks on the parallax of x Lyra. 
Table V, column 1 , contains the mean Z. distance of x Lyras, 
reduced to January 1, 1819, from each days observation with 
the Dublin circle, between July, 1821, and February, 1822, 
in which, besides the usual equations, the equation for parallax 
(const. i",i) is used, and also the constant of aberration is 
taken = 20 *', 35 , conformably to the results in my paper on 
solar nutation, above referred to. 
Column s contains the difference between this and the 
mean zenith distance 14°45' 56",42. 
Column 3 contains the mean zenith distance uncorrected 
for parallax, and taking the aberration = 20". 25. 
Column 4 contains the difference between the 3rd column 
and the mean 14 ° 45 ' 56", 41. 
Table VI. contains the mean places of several stars ob- 
tained at different periods. These stars having been very 
frequently observed in consequence of the investigations about 
parallax, show the consistency of the instrument at these 
different periods. 
