Mr. Pond on tlie parallax of the fixed stars. 163 
The mean of 40 observations of a. Lyras from 
June 22, to August 21, gives for the north 
o / /I 
polar distance of that star - 51 23 0,278 
The mean of 20 taken nearer to the period of 
opposition will be 51 23 0,461 
The mean of 30 winter observations is 51 23 0,867 
The discordance between the winter and summer observa- 
tions, therefore, does not exceed of" equal to one third of 
the discordance found by Dr. Bkinkley, and with the refrac- 
tion employed by him, it would be about one quarter of a 
second less. 
u Cygni. 
Thirty observations of this star in summer, 
O / // 
about the period of opposition, give - 45 22 56,933 
The mean of 30 in winter - -■ 45 22 57,448 
But as 10 of these observations were made 
too far distant from the time of conjunction, 
it will be better to take the mean of 20, 
which is - - - 45 22 57,489 
The difference 0,556'' is the total discordance in favour of 
parallax. This quantity is likewise nearly equal to one^ 
third of the discordance found by Dr. Brinkley. 
a Aquilae. 
Thirty observations of this star in the summer * 
of 1813, are as follows : - 10=81 36 58,555 
10=81 36 58,536 
10=81 36 58,300 
Mean of 30 summer - - 81 36 58,464 
Mean of 20 winter - - 81 36 59,300 
Difference 
0,836 
