and positions of 458 double and triple stars , &c. 57 
No. CCCCLII. R. A. 4 h 26 m ; Decl. 1 6 ° 8' N. 
Aldebaran; Struve, 129 ; VI. 66 . 
Double ; 1st and 20th magnitudes. 
Passy ; January 16, 1825 ; Seven-feet Equatorial. 
Position = 53 0 2 7' nf± | 4 Obs. | Diff. = i° 12'. Excessively difficult. 
Distance about a minute and a half by estimation ; observations of distance 
cannot be procured, the small star being so excessively faint, that it becomes invi- 
sible under the slightest illumination. The position here given may be liable to an 
error of one, or two degrees. 
Passy ; January 19, 1825 ; Seven-feet Equatorial. 
1st and 20th magnitudes. 
Position =: 54 0 32 ' nf± | 2 Obs. j Diff. — o° 36'. Excessively difficult. 
The small star will not bear even the slightest illumination. The night being 
unusually favourable, I was very anxions to procure, if possible, measures entitled 
to confidence; and finding all attempts with a power of 179 ineffectual, I applied 
273 : no advantage however was gained by the change of eye-piece. The observa- 
tions of position must, I fear, be regarded with distrust, and any of distance with 
this instrument are altogether impracticable. 
Mean Result. 
Position 53° 4 9 ' nf + {6 Obs.); Distance about one minute 
and a half by estimation ; Epoch 1825.04. 
In 1781 the angle was 5 2 0 58' nf. In 1802 it was mea- 
sured at 54 0 8' nf : the present is nearly a mean between 
them. It is clear therefore that no very sensible motion can 
exist in this star. According to the proper motions set down 
in Piazzi s catalogue, the angle of position should be liable 
to a slow change in the direction np sf or — , amounting how- 
ever to a quantity hardly cognizable in 40 years. (H.) 
MDCCCXXVI. i 
