Inyo, a S. E. county of California, bounded E. by Nevada and W. by the Sierra Nevada mountains; area, 4,680 sq. m.; pop. in 1870, 1,956, of whom 29 were Chinese. The Sierra Nevada here embraces several lofty peaks, among which is Mt. Whitney. The Inyo, Telescope, and Amargosa mountains are parallel ranges E. of Owen's river, which flows from the north into Owen's lake, a body of water 18 by 12 m. in extent. The valley of the river is from 15 to 25 m. wide, but only a strip 2 to 3 m. broad can be cultivated. This strip, embracing about 250,000 acres, is very fertile. Argentiferous galena, gold, copper, sulphur, and tin are found. The chief productions in 1870 were 13,629 bushels of wheat, 22,915 of Indian corn, 2,175 of oats, 4,905 of barley, 6,336 of potatoes, 20,940 lbs. of butter, and 1,456 tons of hay. There were 1,514 horses, 5,662 cattle, 521 sheep, and 688 swine; 2 saw mills, and 12 quartz mills. Capital, Independence.

10, in Greek mythology, the daughter of Ina-chus, the founder of the worship of Juno at Argos, or according to others of Piren or Ja-sus. She was beloved by Jupiter, who on account of Juno's jealousy changed her into a white heifer. Juno obtained from him the gift of the heifer, which she placed under the charge of Argus Panoptes in her grove at Mycenae. Mercury, commissioned by Jupiter, was guided by a bird to Argus, slew him with a stone, and delivered Io. Thereupon Juno sent a gadfly, which tormented Io and pursued her in a state of frenzy over the whole earth, till at last she rested on the banks of the Nile, where she recovered the human form, bore a son to Jupiter named Epaphus, and, according to some accounts, introduced the worship of Isis, with whom she afterward became identified. The fullest narrative of her wanderings is in the " Prometheus " of AEschylus. As usually explained, Io represents the moon, and her wanderings the moon's phases; Argus, the stars of heaven; and Mercury, as the god of mists and clouds, is the Argus-slayer.