In consulting Map No. 17, the observer is supposed to face the east and northeast. We will begin our survey with Andromeda. The three chief stars of this constellation are of the second magnitude, and lie in a long, bending row, beginning with Alpha ([alpha]), or Alpheratz, in the head, which, as we have seen, marks one corner of the great Square of Pegasus. Beta ([beta]), or Mirach, with the smaller stars Mu ([mu]) and Nu ([nu]), form the girdle. The third of the chief stars is Gamma ([gamma]), or Almaach, situated in the left foot. The little group of stars designated Lambda ([lambda]), Kappa ([kappa]), and Iota ([iota]), mark the extended right hand chained to the rock, and Zeta ([zeta]) and some smaller stars southwest of it show the left arm and hand, also stretched forth and shackled. In searching for picturesque objects in Andromeda, begin with Alpheratz and the groups forming the hands. Below the girdle will be seen a rather remarkable arrangement of small stars in the mouth of the Northern Fish. Now follow up the line of the girdle to the star Nu ([nu]). If your glass has a pretty wide field, your eye will immediately catch the glimmer of the Great Nebula of Andromeda in the same field with the star. This is the oldest or earliest discovered of the nebulae, and, with the exception of that in Orion, is the grandest visible in this hemisphere. Of course, not much can be expected of an opera-glass in viewing such an object; and yet a good glass, in clear weather and the absence of the moon, makes a very attractive spectacle of it. [Illustration: THE GREAT ANDROMEDA NEBULA.]