250 Mr. South's observations of the apparent distances 
No. DCCXLI. continued. 
Mean Result. 
of A. B. Position 86° 13' nf (10 Obs.) ; Epoch 1825.59 ; 
Distance 6".439 (20 Obs.) ; Epoch 1825.64. 
of AC. Position 6o° 12' sf (10 Obs.); Epoch 1825.62 ; 
Distance 57"-325 (15 Obs.) ; Epoch 1825.65. 
No. DCCXLII. R. A. 20 11 8 m ; Decl. 46 0 12' N. 
o 2 Cygni; Struve, 667 ; VI. 10. 
Double ; 5th and 8th magnitudes. 
Blackman-street ; June 28 , 1824 ; Five-feet Equatorial. 
Position — 84° o' sf I 5 Obs. I Diff. — o° 15' ^ 
Distances \' ^6 j 5 Obs. | DifF. — j".o42^ ' ’ * * 
Observed when 4 hours east of the meridian. 
Passy ; November 3 , 1824 ; Seven-feet Equatorial. 
5th and 8th magnitudes. 
Position = 83° 47' sf 5 Obs. I Diff. =: o° 35' } 
Distances 1' 46".4io 5 Obs. | Diff. — i".2$o\ «... 
Mean Result. 
Position 83° 53' sf ; Distance 1' 46".393 ; Epoch 1824.66. 
The position of 1781 is 87° 14' sp, differing 8° 53' from 
the present ; an extraordinary change for a star of the 6th 
class, and one so easy of measurement. In Piazzi’s cata- 
logue, a proper motion of — -o".03 in R. A. and 4 *°"- 18 in 
declination is ascribed to the large star. This should carry 
the large star almost directly away from the small one (and 
indeed there is an apparent increase of 6" in the distance, 
could the earlier measure be relied on ) ; but no sensible 
change of angle could thus arise. This star should be re- 
measured after a lapse of 20 or 30 years. (H.) 
