distances and positions of 380 double and triple stars , &c. 115 
No. XC. R. A. 8 h 2 m ; Decl. 18 0 11' N. 
f Cancri ; Struve 289 ; III. 19. 
Double ; pretty unequal ; is not to be seen triple, although 
beautifully defined and round. 
Position. 
Feb. si, 1822. 
Five-feet Equatorial. 
Sf 
Position 
Distance 
68° 1/ sf 
241 
6 " 
Distance. 
Parts. 
21. o") 
19. 6 I 
18. 9 )>H 
18. 2 
19. o, 
22. 1 ' 
21. 8 
21. 1 
20. 
21 
:o. 5 I 
!I. 4 j 
Mean — — 2 1.43 
Mean = 20.36 
Z — — 0.60 
19.76 
The series of observations of this remarkable star is as 
follows : 
Position. Distance. 
88° 1 6' sp 1781.89 ; 8". 046, 1780 ; H. Catal. of 1782. 
81 47 sf 1802.11; H. account of changes, &c. 
71 21 sf 1820.29; Struve, Additamenta, &c. 
70 1 sf 1821.07 ; 5 71 4 from A decl. 5 /y .37 ; Struve, Dorp. 
Obs. iii. 
68 17 sf 1822.14 ; H. Jun. and S. as above. 
In 40.25 years then the change of angle amounts to 23°42', 
which is at the mean rate of — o°.58i3 per annum, in the 
direction np sf , or retrograde. The change of position has 
also been accompanied with a considerable diminution of dis- 
tance ; and further observations must decide whether this is 
the result of rectilinear or orbitual motion. If the former, 
