ger.
Many other faint stars are scattered about, however, and Tycho's
measures were not sufficiently exact to enable us to identify the
precise position of his star. If the phenomenon was due to a collision,
no reappearance of the star is to be expected.

Camelopardalus is a very inconspicuous constellation, yet it furnishes
considerable occupation for the telescope. Sigma 390, of magnitude five,
has a companion of magnitude nine and a half, distance 15", 160 deg.. Sigma
385, also of the fifth magnitude, has a ninth-magnitude companion,
distance only 2.4", p. 160 deg.. According to some observers, the larger
star is yellow and the smaller white. The star 1 is a very pretty
double, magnitudes both six, distance 10.4". Its neighbor 2 of magnitude
six has an eighth-magnitude companion, distance 1.7", p. 278 deg.. The star
7 of magnitude five is also double, the companion of magnitude eight
being distant only 1.2". A glance at star cluster 940, which shows a
slight central condensation, completes our work in Camelopardalus, and
we turn to Ursa Major, represented in map No. 26. Here there are many
interesting doubles and triples. Beginning with iota we find at once
occupation for our largest glass. The magnitudes are three and ten,
distance 10", p. 357 deg.. In the double star 23 the magnitudes are four and
nine, distance 23", p. 272 deg.. A more pleasing object is sigma^2, a
greenish fifth-magnitude star which has an eighth-magnitude companion,
distance 2.6", p. 245 deg.. A good double for our four-inch glass is xi,
whose magnitudes are four and five, distance 1.87", p. 183 deg.. This is a
binary with a period of revolution of about sixty years, and is
interesting as the first binary star whose orbit was determined. Savary
calculated it in 1828. Near by is nu, a difficult double, magnitudes
four and ten and a half, distance 7", p. 147 deg.. In 57 we find again an
easy double magnitudes six and eight, distance 5.5", p. 4 deg.. Another
similar double is 65, magnitudes six and eight, distance 3.9", p. 38 deg.. A
third star, magnitude seven, is seen at a distance of 114" from the
primary.

We come now to Ursa Major's principal attraction zeta, frequently called
Mizar. The naked eye perceives near it a smaller star, named Alcor. With
the three-inch glass and a medium power we divide Mizar into two bright
stars brilliantly contrasted in color, the larger being white and the
smaller blue-green. Beside Alcor, several fainter stars