and positions of sQ double and triple stars , &c. 321 



No. VI. R. A. 7^ 23" ; Decl. 32° 17'N. 



Castor ; II. 1 ; H. and S. 81. 



continued. 



Mean Result. 

 Position 6'' 42' sp (42 Obs.) ; Epoch 1825.23 ; 

 Distance 4".767 (20 Obs.) ; Epoch 1825.26. 



Note J In taking the mean, the ten observations of February 1 8 are considered 

 equivalent to the seven of which the other sets are composed. 



These measures, compared with those recorded in the Phi- 

 losophical Transactions for 1824, afford, in the short interval 

 of 2^.12, a very satisfactory verification of the quantity as 

 v^ell as of the direction of the motion there assigned. The 

 angle at that epoch (1823.1 1) was 5° 1' sp. It is now 6° 42' sp. 

 The motion then is — 1° 41' or retrograde, as it ought to be. 

 Now, if we compute the motion on the supposition of the 

 actual angular velocity being (as there assigned) -*-o°.777, 

 we shall find — 1° 38', differing insensibly from the observed 

 quantity. That this degree of exactness is not quite acci- 

 dental, other similar instances to be adduced will convince 

 MS. (H.) 



No. VII. R. A. 7^ 58" ; Decl. 28° o' N. 



11 Cancri ; I. 11 ; H. and S. 88. 



Double ; 8th and 9^ magnitudes. 



Blackman-street ; March 12, 1824; Five-feet Equatorial. 



Position == 83° 24' np 



Distance = 4".694 



5 Obs. J DifF. = 3° o' 



5 Obs. I Diff.= o".8s3 5 • • • • 



Blackman-street ; March 31, 1824 ; Five-feet Equatorial. 



8th and 9 J magnitudes. 



Position =: 83* 7' w j9 

 Distance = 4"'659 



MDCCCXXVI. 1 1 



5 Obs. DifF. = 2° 46' 7 



5 Obs. Diff. = o".22iJ • • • ^ 



