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ored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere. Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions.

An instrument for measuring the forms and angles of salts and crystals; a goniometer.

h heat. Dr. Prior. -- Jumping hare. (Zoöl.) See under Jumping. -- Little chief hare, or Crying hare. (Zoöl.) See Chief hare. -- Sea hare. (Zoöl.) See Aplysia.

ying harmaline (in the Peganum harmala), and obtained from it by oxidation. It is a white crystalline substance.

A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone.

Help! Halloo! An exclamation of distress; a call for succor;- the ancient Norman hue and cry. "Harrow and well away!" Spenser. Harrow! alas! here lies my fellow slain. Chaucer.

A cry in war as the signal for indiscriminate slaughter. Toone. Do not cry havoc, where you should but hunt With modest warrant. Shak. Cry 'havoc,' and let slip the dogs of war! Shak.

To offer for sale by outcry in the street; to carry (merchandise) about from place to place for sale; to peddle; as, to hawk goods or pamphlets. His works were hawked in every street. Swift.

One who sells wares by crying them in the street; hence, a peddler or a packman.

substance found in the root of the elecampane (Inula helenium), and extracted as a white crystalline or oily material, with a slightly bitter taste.

A glucoside obtained as a white crystalline substance by partial oxidation of salicin, from a willow (Salix Helix of Linnæus.)

ucoside accompanying helleborin in several species of hellebore, and extracted as a white crystalline substance with a bittersweet taste. It has a strong action on the heart, resembling digitalin.

A poisonous glucoside found in several species of hellebore, and extracted as a white crystalline substance with a sharp tingling taste. It possesses the essential virtues of the plant; -- called also elleborin.

untary half cough, loud or subdued, and would perhaps be better expressed by hm. Cough or cry hem, if anybody come. Shak.

A reddish brown or violet crystalline substance, C16H12O6, got from hematoxylin by partial oxidation, and regarded as analogous to the phthaleins.

de, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in massive and earthy forms; -- the last called red ocher. Called also specular iron, oligist iron, rhombohedral iron ore, and bloodstone. See Brown hematite, under Brown.

A crystalline or amorphous pigment, free from iron, formed from hematin in old blood stains, and in old hemorrhages in the body. It resembles bilirubin. When present in the corpora lutea it is called hæmolutein.

he warm-blooded vertebrates, comprising the mammals and birds; -- the antithesis to hematocrya.

Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it…

The property of crystallizing hemihedrally.