Mr. Pond on the parallax of the fixed stars. 
355 
Result of 54 observations of u Cygni compared with fi Auriga;, 
fi’om 21 st January 1817, to the 1 6th of May. 
a Cygni + j8 Aurigae 
S so 
S KO 
Jan. 8.197+ 9-7°5 = *7-9°2 
8.2954- 9.673= 17.968 
8.255+ 9-89 2 = j 8.H7 
7-918+ 10 °58 = 17-971 
8.225 + 9966 = 18.191 
8.262 4" 9.560 = 17.822 
8.047 4- 10 072 = 18.119 
May 7.553 -f 10 536 = 1^089 
7.213 + 10.812 = 18.025 
1 8. 249 + 9.757 = 1 8.006 
js.i 33 + 9-861 = 17.994 
|7-6o4+ 10.473 = 18.077 
As it so happens that $ Cygni and b Aurigae pass through the 
field of the telescope, they have likewise been observed. 
Observations of these stars cannot be made directly useful 
in investigating the parallax of a. Cygni, but may be of some 
importance in determining other equations; they likewise 
serve to show the limits of error to which the instrument 
may be liable. 
The above observations do not include the extreme posi- 
tions of the star in which it arrives at its maximum and 
minimum of parallax. As it appeared desirable to extend 
the period of observation as much as possible, l requested 
permission to insert the continuation of them to the time the 
impression of my Paper was required to complete the volume. 
They are therefore continued to the 2 1 st of September, at which 
