333. _The Lyre, the Swan, the Eagle, and the Dolphin._--_Altair_, the principal star of _Aquila_, or the _Eagle_, lies on the opposite side of the Milky-Way from Vega. Altair is a first-magnitude star, and has a faint star on each side of it, as shown in Fig. 380. Vega, also of the first magnitude, is the principal star of _Lyra_, or the _Lyre_. Between these two stars, and a little farther to the north, are several stars arranged in the form of an immense cross. The bright star at the head of this cross is called _Deneb_. The cross lies in the Milky-Way, and contains the chief stars of the constellation _Cygnus_, or the _Swan_. A little to the north of Altair are four stars in the form of a diamond. This asterism is popularly known as _Job's Coffin_. These four stars are the chief stars of _Delphinus_, or the _Dolphin_. These four constellations are shown together in Fig. 381. The _Swan_ is visible from June to December, in the evening. [Illustration: Fig. 381.] 334. _Virgo._--A line drawn from Alpha to Gamma of the Dipper, and prolonged with a slight bend at Gamma, will reach to a first-magnitude star called _Spica_ (Fig. 382). This is the chief star of the constellation _Virgo_, or the _Virgin_, and forms a large isosceles triangle with _Arcturus_ and _Denebola_. [Illustration: Fig. 382.] _Virgo_ is represented in Fig. 383. To the right of this constellation, as shown in the figure, there are four stars which form a trapezium, and mark the constellation _Corvus_, or the _Crow_. This bird is represented as standing on the body of _Hydra_, or the _Water-Snake_. _Virgo_ is visible in the evening, from April to August. [Illustration: Fig. 383.] [Illustration: Fig. 384.] [Illustration: Fig. 385.] 335. _The Twins._--A line drawn from Delta to Beta of the Dipper, and prolonged as shown in Fig. 384, passes between two bright stars called _Castor_ and _Pollux_. The latter of these is usually reckoned as a first-magnitude star. These are the principal stars of the constellation _Gemini_, or the _Twins_, which is shown in Fig. 385. The constellation _Canis Minor_, or the _Little Dog_, is shown in the lower part of the figure. There are two conspicuous stars in this constellation, the brightest of which is of the first magnitude, and called _Procyon_. The region to which we have now been brought is the richest of the northern sky, containing no less than seven first-magnitude stars. These are _Sirius_, _Procyon_, _Pollux_, _Capella_, _Aldebaran_, _Betelgeuse_, and _Rigel_. They are shown in Fig. 386. [Illustration: Fig. 386.]