Hyades, in Greek mythology, nymphs variously described as being from two to seven in number, and bearing 18 names. According to some authorities, Jupiter placed them among the stars in honor of their care of the infant Bacchus; while others say it was to reward them for their long mourning for their brother Hyas, who had been killed by a wild boar.

Hydaspes, A River Of Ancient India

See Jhylum, and Punjaub.


See Entozoa, vol. vi., p. 666.


I. An E. county of North Carolina, bordering on Pamlico sound, and bounded W. by Pango river; area, about 650 sq. m.; pop. in 1870, 6,445, of whom 2,378 were colored. It has a level surface, a large part of which is occupied by pine, cypress, and cedar swamps. The products of the pine are the staples of export. The chief productions in 1870 were 21,-319 bushels of wheat, 163,216 of Indian corn, 11,633 of oats, 235 bales of cotton, and 171,-548 lbs. of rice. There were 378 horses, 681 milch cows, 1,484 other cattle, and 3,706 swine. Capital, Swan Quarter. II. A S. E. county of Dakota, recently formed, and not included in the census of 1870; area, about 1,000 sq. m. Its S. W. corner touches the Missouri river.

Hyde De Neuville

See Hyde de Neuville.


See Hercules.

Hydra #1

I. An island in the Grecian archipelago, off the E. coast of the Morea, belonging to the nomarchy of Argolis and Corinth; greatest length N. E. to S. W. about 12 m., greatest breadth 3 m.; pop. about 20,000. Its surface is rocky, sterile, and mountainous. The inhabitants are esteemed the best sailors of Greece. II. A town, capital of the island, situated on a barren rugged height on the N. W. shore; pop. in 1870, 7,428. The streets are steep and uneven, and the houses substantially built. The manufactures are silk and cotton stuffs, soap, and leather. The harbor is formed by a deep bay, but is neither spacious nor well sheltered. During the war of the revolution Hydra was a place of general refuge for people from all parts of Greece.


Hydrabad, a town of British India, in the province of Sinde, situated on an eminence belonging to the Gunjah hills, 4 m. E. of the E. bank of the Indus; pop. about 20,000. Part of it is built on an island 15 m. long, which is formed by the Indus and an offset of that stream called the Fulailee. It is defended by a fortress of imposing appearance but no great strength, and has manufactures of matchlocks, swords, spears, and shields, and of ornamental silks and cottons. The town is connected with Kurrachee on the Arabian sea by a railway 120 m. long. Hydrabad was formerly the residence of the chief amirs of Sinde, who governed the southern and principal part of the country. A victory was gained over a Sindian force near here by Sir C. Napier, Feb. 24,1843.


See Puccoon.


Hydrates (Gr.Hydrates 090026 water), compounds containing water, or its elements in the proportion to form water. Thus lime (oxide of calcium) slaked with water forms a chemical combination with a portion of this, and falls to a white powder, which is a hydrate of lime. Hydrate of potassa is a combination of potassa and water, and is permanent even when exposed to high temperature. Common oil of vitriol is also a chemical combination of water and sulphuric anhydride.