This constellation, according to mythology, is Lycaon, King of Arcadia, who lived 3,600 years ago, and was changed into a wolf by Jupiter for sacrificing human victims at the altar of Pan. * * * * * LIBRA.--When the sun enters the sign Libra, the days and nights are of equal duration, and seem to observe an equilibrium like a balance. Libra contains fifty-one stars, and comes to the meridian the 22d of June. It may be known by its four principal stars forming a quadrilateral figure, lying north-east and south-west, and having its upper and lower indices nearly in a straight line running north and south. The two stars which form the south-west side of the square are situated about six degrees apart, and distinguish the southern scale. The two which form the north-east side are seven degrees apart, and mark the northern scale. The Libra of the Zodiac is found upon all the hieroglyphics of Egypt, which is proof of its great antiquity. In the Zodiacs of Estne and Dendera, Virgo is represented as holding the balance in her hand as an emblem of equal justice to all. The Greeks assert that the balance was placed among the stars to perpetuate the memory of Mochus, the inventor of weights and measures. It is known, however, to have existed prior to the Greek nation, and therefore the assumption must be erroneous. * * * * * SERPENS.--This constellation is situated chiefly between Libra and Corona Borealis. Those stars that lie scattered along for about twenty-five degrees, in a serpentine direction between Libra and the Crown, mark the body and head of the serpent; five of these, standing in a cluster, form the head. They are about ten degrees south of the crown. "Vast as the starry serpent that, on high, Tracks the clear ether and divides the sky, And southward winding from the northern Wain, Shoots to remoter spheres its glittering train." Many nations have worshipped the Serpent, among which are the Hivites and aborigines of South America. Job says: "By his spirit He hath garnished the heaven; his hand hath formed the crooked Serpent." * * * * * CORONA BOREALIS.--Among the starry hosts that deck the summer sky, there is no group more beautiful than the northern Crown. It is situated north of the Serpent, and may be readily distinguished by its six principal stars curving round into a wreath or crown. Alphacca, its brightest star, is eleven degrees east of Mirac in Bootes, and comes to the meridian the 30th of June. This group contains twenty-one stars, of which those that compose the wreath are alone conspicuous. This beautiful cluster of stars is said to have been placed in the heavens to commemorate the crown presented to Ariadne, Princess of Crete, by Bacchus.