578 
Proceedings of the Royal Irish Academy. 
about 82". The following are some recent measures of the binary 
pair : — 
1886-924 : lll°-03 : 3"-01, Tarrant. 
1888-84 : 106 -8 : 2 -94, Burnham. 
9. 14(i) Orionis = 0. Struve, 98. About 60° of the apparent orbit 
had been described up to 1889. My elements represent all the measures 
fairly well, the greatest difference, 6o - 0^ being + 5°-05 at the epoch 
1865-98. According to this orbit "the distance will remain nearly 
constant (about 1") during the next fifty years, the angle diminishing 
to about 107° in the year 1936." {Monthly Notices, R.A.S., March, 
1887.) The following are some recent measures : — 
1886- 988 : 196°-26 : 1"-15, Tarrant 2866). 
1887- 025 : 196 -1 : 0 -95, Young. 
1887- 117 : 195 -56 : 0 -94, Schiaparelli. 
1888- 097 : 193 -32 : 0 -952, „ 
1888-90 : 193 -4 : 0 -98, Leavenworth. 
10. 0. Struve, 149. About 92° of the apparent orbit has been 
described since its discovery by 0. Struve in 1843, the distance 
increasing from about 0"-48 to 0"-72. The elements given in the 
Catalogue were published by Prof. Glasenapp in 1889, and represent 
the measures fairly well. Some recent measures are : — 
1888-21 : 296°-50 : 0"-83, Schiaparelli. 
1883- 17 : 289 -8 : 0 -74, Engelmann. 
1884- 20 : 292 -55 : 0 '93, „ 
11. 12 Lyncis (AB) = Struve, 948. This is the close pair of a 
fine triple star discovered by Sir "W". Herschel in 1780. The arc 
described up to 1887 is about 55°. My elements represent all the 
measures fairly well, the greatest residual {6^ - 6c) being + 4°-70 at 
the epoch 1866-31. Some recent measures are : — 
1881- 28 : 129°-5 : l"-55, Jedrzejewicz. 
1882- 76 : 128 -4 : 1 -704, Engelmann. 
1887-325 : 126 -32 : 1 -56, Tarrant {A.N., 2898). 
The three stars are now nearly in a straight line, Tarrant measured 
AC as follows : — 
1887-325 : 306°-62 : 8''-62, 
which shows little, if any, change since Sir W. Herschel's measure — 
1782-34 : 302°-5 : 9''-38. 
