164 Mr. Pond on the parallax of the fixed stars . 
With Dr. Brinkley's refractions, this difference would be 
reduced to less than half a second, a quantity equal to one 
quarter of the discordance found by Dr. Brinkley. 
On the Observations of the year 1812. 
The observations of the year 1812, are liable to all the 
objections which I have already stated, yet so very small is 
the effect of change in the position of the telescope, that I 
should be inclined myself to prefer a mean taken from the 
two years observations, than to that deduced from the obser- 
vations of 1813 above. The early observations in the sum- 
mer of 1812, are probably not very good, the instrument 
being then in a very unfinished state, « Lyras was diligently 
observed during the whole of the summer ; there are but few 
observations of « Aquilae, and none of a Cygni ; but the 
winter observations of these stars are very good. The mean 
result of two years observations will stand as follows : 
a Lyras. 
. 
Summer 
Winter 
No. of 
No. of 
Observations. u 
Observations. K 
l8l2 24 0,165 
l8l2 20 0,711 
1813 4° 0,278 
1813 30 0,873 
64 0,236 
50 0,808 
Difference 0.572" with Bradley's refractions. 
The French refractions would 
reduce this difference to 
about 0,3" or 0,4''. 
a. Aquilae. 
Summer 
Winter 
No. of 
No. of 
Observations. „ 
Observations. „ 
l8l2 IO 58,052 
l8l2 20 59 fio 6 
1815 30 58,464 
1813 20 59>3°° 
4 ° 5 $ 3 61 ' 
40 59,453 
// 
I.092 
