( ) 
Abt, .^Observations on Double Stars. By M. Struve 
of Dorpat. (Continued from Vol. IX. p. 341.) 
The very interesting observations of M. Struve of Dorpat, 
which we laid before our readers in the last Number of this 
Journal, we are now able to continue, from the Correspondance 
Astronomique of Baron Zach, who has extracted them from the 
second volume of M. Struve’s Collection of Astronomical Ob- 
servations. The same class of observations is continued in the 
3d volume of the same Becueil, so that we shall have occasion 
to resume the subject in a future Number. 
17. « Cassiopeia. K. Asc. 0^ 30'. Decl. 55° 33^ N, 
Sd-3d and 9th-- 10th Magnitudes. 
As the small star changes both its distance and its angle of 
position, it must describe an ellipse round the great one. The 
following are the observations : 
Distances. Angle of Position, Diff. in R, Asc. Diff. in Decl. 
1780. T, 62".81 4r0' ^1'10".0 +34.".6 Hersckel. 
1815.2, 59.40 10 33 —4 13.2 +10.9 Struve. 
' 1819.9, 58 .80 9 3 — 1 42 .6 +9 -25 Ditto. 
18. Cassiopeia 78. R. Asc. 0^ 38'. Decl, 50° 27' N. 
Stars of variable Magnitudes. 
According to Sir W. Herschel, these stars were in 1780 of 
very unequal magnitude, and difficult to be seen. M, Struve 
sees them at present with difficulty, and their magnitude is near- 
ly equal, viz. 7.8. The distance is supposed to increase. 
1780.7, Angle of Position 50'=* 30' S. Foil. Herschel. 
1819.6, - - 58 42 Struve. 
19. 65 Pisces. R. Asc. 0^ 40', Decl, 26° 43' N, 
6th-7th and 6th Mag. 
Difference of R. Asc. - — 0".384 
Angle of Position, - 2 6°. 85 N. Prec, 
Distance, - - 5". 7 7 calculated. 
Difference of Decliii, - + 2". 60 ditto. 
Sir W. Herschel found the angle of position 30° 57' N. Free. 
