See Hydromechanics.


See Hydromechanics.

Hydrofluoric Acid

See Fluorine.


See Hydromechanics.


See Otranto.


Hyeres, a town of France, in the department of Var, on the S. declivity of a hill, 9 m. E. of Toulon, and 3 m. from the Mediterranean; pop. in 1866, 10,878. The principal edifices are the old church, one of the most singular structures in France, and an ancient chateau, now used as a town hall. In the principal square is a column, surmounted by a white marble bust of the celebrated Massillon, who was a native of the town. Hyeres is considered one of the healthiest winter residences in the south of France, and is much resorted to by invalids. Remains of an ancient Roman city exist in its vicinity. In the roadstead opposite the town, and belonging to it, is a group of small islands called the isles of Hyeres (ancient Staechades), two of which are fortified. During the middle ages the place was called Hiedera, and was a favorite port of the pilgrims to Jerusalem.

Hygiea, Or Hygea, In Greek Mythology

Hygiea, Or Hygea, In Greek Mythology, the goddess of health, a daughter of AEsculapius. She was represented by artists as a virgin in flowing garments feeding a serpent from a cup; the poets speak of her as a smiling goddess with bright glances, and a favorite of Apollo. By the Romans she was in time identified with the old Sabine goddess Salus.

Hyksos Or Shepherd Kings

See Egypt, vol. vi., p. 460.


Hylas, in Greek mythology, son of Theoda-mas, king of the Dryopes, and the nymph Me-nodice. Hercules, after slaying Theodamas, adopted Hylas, and took him on the Argonau-tic expedition. When they arrived at Mysia, Hylas went to a neighboring well for water, but the maids of that fountain became so fascinated with his beauty that they drew him into the water, and he was never seen again. When Hercules shouted for him, the youth's voice was heard from the well like a faint echo; and he was so enraged at his loss that he threatened to ravage the country of the My-sians if they did not produce Hylas dead or alive. They sought him in vain, and ultimately instituted an annual festival, during which they roamed over the mountains calling out the name of Hylas.


Hylaeosaurus (Gr.Hylaeosaurus 090065 belonging to wood, andHylaeosaurus 090066 lizard), the name given by Dr. Mantell to an extinct dinosaurian reptile, from the Jurassic strata of Tilgate forest, having the usual mammalian characters of its tribe, viz.: long bones with a medullary cavity, pachyderm-like feet, and sacrum of five united vertebrae. It attained a size of 20 to 25 ft., and was believed by Mantell and Buckland to have had an enormous dorsal dermal fringe like the horny spines on the back of the iguana; its skin was covered with circular or elliptical plates.