NOTES.

2021. This is a system apparently in slow orbital revo

2022. The observations indicate no appreciable change Struve's observation of 1830 appears erro

in 40 years.

neous.

3105. The only observations I have found of this close pair are the following:

2120. It has been hitherto difficult to pronounce definitely as to the motion of these stars but the following observations seem to indicate that the change in position angle and distance is due to a rectilinear movement of the smaller star:

2156. Probably a binary of long period. Change in

angle in 77 years only 6°.

2173. A binary system in quick motion, the plane of the moving body passing nearly through the sun.

2272 (70 Ophinchi). This is one of the most interesting of the binary systems, and one to which special interest has been drawn by the paper of Dr. See, A. J., 363. The following measures give a very safe position for 1896:

2541. The observations of different observers show con

siderable discrepancies, but the change is due probably to