Gore — A Catalogue of Binary Stars, 8fc. 993 
Sept., 1886). In my computation of tlie orbit I have adopted the 
reading 18° 21'^./., as recorded by Herschel. 
Some recent measures are as follows : — 
1882-84 : 
321°-44 
1" 
•752, Engelmann. 
1883-82 : 
321 
'5 
1 
•79, 
1885-521 : 
317 
•79 
1 
•66, Tarrant {A.JST., 2866). 
1885-90 : 
318 
•91 : 
1 
•723, Engelmann. 
1886-435 : 
318 
•3 
1 
•71 (''too large"), Tarrant. 
1886-65 : 
315 
•0 : 
1 
•6, J. J. M. Perry. 
1887-50 : 
315 
•83 : 
Tarrant. 
I find that the plane of Behrmann's second orbit is at right angles 
to the plane of the Milky Way. 
49. 0. Struve, 387. An arc of about 130° of the apparent orbit 
has been described since its discovery in 1842. Glasenapp's orbit 
represents the measures fairly well, considering the difficult character 
of the star and the discordancy of some of the measures. 
Some recent measures are : — 
1883-13 
1886-516 
1886- 76 
1887- 552 
1888- 76 
5°-5 : 0"-40, Engelmann. 
0 -89 : 0 -45, Tarrant (^.iV., 2866), 
357 -05 : (0 -50), H. Struve. 
357 -79 : 0 -54, Schiaparelli. 
354 -55 : (0 -55), H. Struve. 
50. 0. Struve, 400. An arc of about 190° of the apparent orbit 
has been described since its discovery in 1844. My elements represent 
the measures to 1885 fairly well, but recent measures indicate that 
the orbit will require revision. These measures are, however, rather 
discordant : — 
1885-715 
1885- 731 
1886- 663 
1887- 916 
est. Young. 
149°-5 : 0"-3, 
139 -5 : >0 -25 „ 
107-6 : 0 -44, Hall. 
140 -13 : 0 -25, Schiaparelli. 
I find that the plane of the orbit is at right angles to the plane of 
the Milky Way. 
51. /3 Delphini. The principal star of the wide double S 2704. 
It was discovered by Eurnham in 1873. The period is short, but 
still somewhat uncertain. 
