e secondary 5. Both are
yellow, the primary being of a paler yellow colour than the smaller
star. But the observer may not know where to look for [theta] Serpentis,
since it falls in a part of the constellation quite separated from that
part in which [delta] Serpentis lies. In fact [theta] lies on the
extreme easterly verge of the eastern half of the constellation. It is
to be looked for at about the same elevation as the brilliant Altair,
and (as to azimuth) about midway between Altair and the south.

The stars [alpha]^{1} and [alpha]^{2} Librae form a wide double, perhaps
just separable by the naked eye in very favourable weather. The larger
component is of the third, the smaller of the sixth magnitude, the
former yellow the latter light grey.

The star [beta] Librae is a beautiful light-green star to the naked eye;
in the telescope a wide double, pale emerald and light blue.

In Scorpio there are several very beautiful objects:--

The star Antares or Cor Scorpionis is one of the most beautiful of the
red stars. It has been termed the Sirius of red stars, a term better
merited perhaps by Aldebaran, save for this that, in our latitude,
Antares is, like Sirius, always seen as a brilliant "scintillator"
(because always low down), whereas Aldebaran rises high above the
horizon. Antares is a double star, its companion being a minute green
star. In southern latitudes the companion of Antares may be seen with a
good 4-inch, but in our latitudes a larger opening is wanted. Mr. Dawes
once saw the companion of Antares shining alone for seven seconds, the
primary being hidden by the moon. He found that the colour of the
secondary is not merely the effect of contrast, but that this small star
is really a green sun.

The star [beta] Scorpionis is a fine double, the components 13".1 apart,
their magnitudes 2 and 5-1/2, colours white and lilac. It has been
supposed that this pair is only an optical double, but a long time must
elapse before a decisive opinion can be pronounced on such a point.

The star [sigma] Scorpionis is a wider but much more difficult double,
the smaller component being below the 9th magnitude. The colour of the
primary (4) is white, that of the secondary maroon.

The star [xi] Scorpionis is a neat double, the components 7".2 apart,
their magnitudes 4-1/2 and 7-1/2, their colours white and grey. This
star is really triple, a fifth-magnitude star lying close to the
primary.

In Ophiuchus, a constellatio