588 Proceedings of the Royal Irish Academy, 
B C. 
^(A + B)andC, 1882°-36 : 68°-52 : 7"-63, Doberck. 
„ „ „ 1886-513: 65-83 : 7 •] 4, Tarrant (^.iV;, 2866). 
EC, 1888-50 : 68 -0 : 7 -14, Leavenworth. 
Sir W. Herschel measured (A + B) and C : — 
1782-86 : 88°-6 : 6''-38, 
from which it appears that the motion is very slow. All three stars 
have a common proper motion, and probably from one system. 
36. (T Coronas Borealis = ^ 2032. Dr. Doberck's second orbit is 
probably the best. About 220° of the apparent orbit has been described 
since its discovery by Sir W. Herschel in 1781 ; but the companion is 
now receding from the periastron, and the angular motion will in 
future years become very slow. 
Some recent measures are as follows : — 
1881-26 : 203°.99 : 3''-68, Doberck. 
1883-26 : 205 -4 : 3 -77, Engelmann. 
1885- 74 : 207 -3 : 4 -09, „ 
1886- 487 : 208 -04 : 4 -01, Tarrant { A. N., 2866). 
37. X Ophiuchi = 2 2055. Glasenapp's orbit is probably the best. 
Some recent measures are : — 
1881-235 
: 36°-07 
: 1 
'•40, Doberck. 
1882-41 
. 38 
-44 
1 
•36, 
1884-64 
42 
-7 
1 
•59, Engelmann. 
1885-527 
42 
-79 
1 
•68, Tarrant {A.N., 2866). 
1885-63 
42 
•6 : 
1 
•64, Engelmann. 
1886-66 
44 
-1 
1 
•57, „ 
1888-37 
42 
-6 
1 
•55, Leavenworth. 
38. ^ Herculis = 2 2084. Three complete revolutions of this 
remarkable binary have now been described since its discovery by Sir 
W. Herschel in 1782. Dr. Doberck's second orbit is perhaps the best. 
