s,
and more closely resembles that of Arcturus.

Other interesting objects in Taurus are sigma, divisible with the naked
eye, magnitudes five and five and a half, distance 7'; Sigma 674,
double, magnitudes six and nine, distance 10.5", p. 147 deg.; Sigma 716,
double, magnitudes six and seven, distance 5", p. 200 deg.--a pleasing
sight; tau, triple, magnitudes four, ten and a half, and eleven,
distances 36", p. 249 deg., and 36", p. 60 deg.--the ten-and-a-half-magnitude
star is itself double, as discovered by Burnham; star cluster No. 1030,
not quite as broad as the moon, and containing some stars as large as
the eleventh magnitude; and nebula No. 1157, the so-called "Crab nebula"
of Lord Rosse, which our glasses will show only as a misty patch of
faint light, although large telescopes reveal in it a very curious
structure.

[Illustration: MAP NO. 24.]

We now turn to the cluster of circumpolar constellations sometimes
called the Royal Family, in allusion to the well-known story of the
Ethiopian king Cepheus and his queen Cassiopeia, whose daughter
Andromeda was exposed on the seashore to be devoured by a monster, but
who was saved by the hero Perseus. All these mythologic personages are
represented in the constellations that we are about to study.[4] We
begin with Andromeda (map No. 24). The leading star alpha marks one
corner of the great square of Pegasus. The first star of telescopic
interest that we find in Andromeda is , a double difficult on account of
the faintness of the smaller component. The magnitudes are four and
eleven, distance 49", p. 110 deg.. A few degrees north of the naked eye
detects a glimmering point where lies the Great Nebula in Andromeda.
This is indicated on the map by the number 116. With either of our three
telescopes it is an interesting object, but of course it is advisable to
use our largest glass in order to get as much light as possible. All
that we can see is a long, shuttle-shaped nebulous object, having a
brighter point near the center. Many stars are scattered over the field
in its neighborhood, but the nebula itself, although its spectrum is
peculiar in resembling that of a faint star, is evidently a gaseous or
at any rate a meteoritic mass, since photographs show it to be composed
of a series of imperfectly separated spirals surrounding a vast central
condensation. This peculiarity of the Andromeda nebula, which is
invisible with telescopes although conspicuous in the photograph