The second star of Auriga, Beta (β), or _Menkalina_, the “Shoulder,” is also a spectroscopic binary with a period of only four days. It was the first binary of this class to be discovered. In 1889 Pickering found that its spectral lines were doubled every two days, from which he inferred the duplicate character of the star and calculated the period of revolution of its components. Farther east we see Gemini, the “Twins.” It is a very beautiful constellation, independently of the brightness of its leaders, Castor and Pollux, or Alpha (α) and Beta (β). The feet of the imaginary twins are dipped in the Milky Way nearly above the uplifted club of the giant Orion, and close to the summer solstice. The successive belts of stars crossing the figures of the Twins present an attractive appearance. Castor, although the literal leader of the constellation, is not now as bright as its neighbor, Pollux. A change of brightness must have taken place. Castor is a celebrated binary with a period of about one thousand years. The distance between the two stars composing it is about 5″.5, and, both being bright, they can be separated with small telescopes. Pollux is very near the standard first magnitude in brightness. It has a slightly orange tint in contrast with the whiteness of Castor. Like Orion, Taurus, and Auriga, Gemini offers splendid fields of stars for the opera-glass. A cluster, M35, not far above the place of the summer solstice, is an object of rare beauty when seen with a low telescopic power. South of Gemini shines the bright star Procyon in Canis Minor, the Lesser Dog. This star, whose name implies the “Preceder, or Announcer, of the Dog,” because it rises a little ahead of Sirius, is the only bright star of its constellation. It is interesting for having a dusky companion whose existence was detected by the effects of its attraction before any telescope had revealed it. With this companion Procyon forms a binary system with a period of revolution of about forty years. The star Beta (β) is named Gomeisa, from an Arabic word meaning the “Dim One.” Procyon, Sirius, and Betelgeuse form a magnificent triangle, through which flows the Milky Way.