and positions of 36 double and triple stars y &c. 337 



No. XV. R. A. 14^ 37°^ ; Decl. 27° 51' N. 



g Bootis ; I. 1 ; H. and S. 185. 



continued. 



Passy ; June 14, 1825 ; Seven-feet Equatorial. 

 2nd and 9th magnitudes. 



Position — 53° 3S' np 

 Distance = 3". 126 



7 Obs. 

 5 Obs. 



DifF. = 2° 36' \ Rather difficult. 

 Diff. = o".;2g( Difficult. 



= 2° 36'^ 

 Observed with 181 ; stars on the meridian and well defined, but are not steady. 



Mean Result. 



Position 55** ^5'np (5 Obs.); Epoch 1824.47 ; 

 Position 54° 21' np (49 Obs.) ; Epoch 1825,43 ; 

 Distance 3".356 (25 Obs.) ; Epoch 1825.44. 



Taking the means of the above angles and epochs, allow- 

 ing each a weight proportional to the number of measures 

 on which it rests, we get for the mean Epoch 1825.34 the 

 angle of position 54° 26' np. This, compared with the 

 measures of 1822, gives +1° 27' for the observed motion 

 in the interval of 2.79 years. The motion computed on a 

 supposition of -f- o°.4378 per annum assigned in a former 

 paper, should be + 1° 14', differing insensibly from that 

 actually found by observation. The motion of this star is 

 therefore very satisfactorily confirmed both in direction and 

 quantity ; and when we reflect on the extreme difficulty of 

 it (in respect of position), this will serve to give great confi-* 

 dence in results which depend on a great number of mea- 

 sures, however wide of the mark individual measures may 

 be. (H.) 



MPCCCXXVI. XX 



