356 Mr. Pond on the parallax of the fixed stars. 
time the summer observations may be presumed to terminate. 
Beyond this period, the observations rather belong to the 
autumnal or neutral state of parallax. 
On the result of the observations thus continued, I beg 
leave to add the following remarks. 
If the total number of observations be divided into three 
periods according to the state of the combined parallax, the 
result will appear to be as follows. 
Winter Observations. Rev. t/ 
25*Cygni 24 + 8.173 1 
28 0 Aurigas 35+ 9.811] 
Rev. 
their sum = 59 + 17.984 
Neutral Rev. 
Rev 
2 6*Cygni ,4+ 7-9*° j their sum 
29 /3 Aung® 35 + 10.044 J 
59 + 17-964 
Summer Rev. 
32 a Cygni 24+ 3.340 
22 0 Aurigae35+ 14.825 
jtheir sum 
Rev. 
59+18.165 
The summer of this year has proved the most unfavourable 
for observation of any I recollect for several years. Many 
of the observations of fi Auriga2 were extremely unsatisfac- 
tory. Notwithstanding this, I do not consider the small 
discordance of o''. 2 in the total distance of the two stars in a 
direction contrary to the effect of parallax as accidental, but 
trust that in time I shall discover the cause. For the present, 
however, I am willing to attribute it to error of observation. 
Now, even in this most unfavourable point of view, I think 
we may venture to infer, that (supposing the proportion of 
parallax of each star not to differ greatly from their degree of 
brightness) the mean place of either of them is never deranged 
by parallax above one tenth of a second, because such a de- 
viation would produce, by its double effect on each star, a 
