SOME NEW DOUBLE STARS AND SOUTHERN BINARIES. 27 
the stars of this double, formed in the focus, would spay 54 
separated by a linear space of one four thousandth part of 
The angle and distance of this pair have gradually cas 4 
1874, until now the distance is over 1”, and there is reason to 
sup ; system. 
almost equally difficult is one easily seen by the naked eye: it is 
usc, the second brightest in the little constellation, under the 
divided 
do 
by the large telescope first in April, 1878. The measured di 
is only 0°54, and the angle of position 317° 16. It forms » most 
beautiful object when seen under suitable optical power, and will 
serve as a capital test for defining f ciao Of the other stars in 
preteen unnecessary to speak 'y. They are 
ust a few out of the larger list, and may be interesting. 
Brvary ome 
ay thn Seer ea esacvathion Ae oende Gas petied ck 
the then exi i ions ; e the period of 
a Te 123 oe a second pt reduced it 
eoretical 
dimensions ; but: two wuch-sters forming a binary system 
not one about the other, but about the common centre of 
gravity, which, if the stars are equal, would be a point midway 
