eyesight to detect Alcor, whereas this star may now be easily seen even
in nearly full moonlight. Mizar is a double star, and a fourth star is
seen in the same field of view with the others (see Plate 5). The
distance between Mizar and its companion is 14"·4; the magnitude of
Mizar 3, of the companion 5; their colours white and pale green,
respectively.




CHAPTER V.

A HALF-HOUR WITH ANDROMEDA, CYGNUS, ETC.


Our last half-hour with the double stars, &c., must be a short one, as
we have already nearly filled the space allotted to these objects. The
observations now to be made are supposed to take place during the fourth
quarter of the year,--at ten o'clock on October 23rd; or at nine on
November 7th; or at eight on November 22nd; or at seven on December 6th;
or at hours intermediate to these on intermediate days.

We look first, as in former cases, for the Great Bear, now lying low
down towards the north. Towards the north-east, a few degrees easterly,
are the twin-stars Castor and Pollux, in a vertical position, Castor
uppermost. Above these, a little towards the right, we see the brilliant
Capella; and between Capella and the zenith is seen the festoon of
Perseus. Cassiopeia lies near the zenith, towards the north, and the
Milky Way extends from the eastern horizon across the zenith to the
western horizon. Low down in the east is Orion, half risen above