Next as to the Herdsman. The name of its characteristic star and of itself, Arcturus ([Greek: Arktos], bear; [Greek: Ouros], guardian), is explained without difficulty by its position near the Bears. There are six small stars of the third magnitude in the constellation round its chief one--three of its stars forming an equilateral triangle. Arcturus is in the continuation of the curved line through the three tail stars of the Great Bear. The constellation has also been called Atlas, from its nearness to the pole--as if it held up the heavens, as the fable goes. Beyond this triangle, in the direction of the line continued straight from the Great Bear, is the Northern Crown, whose form immediately suggests its name. Among the stars that compose it one, of the second magnitude, is called the Pearl of the Crown. It was in this point of the heavens that a temporary star appeared in May, 1866, and disappeared again in the course of a few weeks. Among the circumpolar constellations we must now speak of Cassiopeia, or the Chair--or Throne--which is situated on the opposite side of the Pole from the Great Bear; and which is easily found by joining its star [Greek: d] to the Pole and continuing it. The Chair is composed principally of five stars, of the third magnitude, arranged in the form of an M. A smaller star of the fourth magnitude completes the square formed by the three [Greek: b], [Greek: a], and [Greek: g]. The figure thus formed has a fair resemblance to a chair or throne, [Greek: d] and [Greek: e] forming the back; and hence the justification for its popular name. The other name Cassiopeia has its connection and meaning unknown.