Hydrophore

(hi'dro-for.) (From Gr. hydōr, and ph oreo, to produce.] (Phys.) An instrument by which samples of river-or sea-water may be brought up from any given depth. Hydrophyllaceæ, (-fil-la'se-e.) (Bot.) An O. of plants, all. Cortusales, consisting of herbs or small trees, usually with alternate and lobed hispid leaves, natives chiefly of the temperate and cold portions of America. The Water-leaf, genus Hydrophyllum, is so called from having in the spring a small quantity of water in the cavity of each leaf. Hy'drops, Hydrop's ia. (Med.) Same as DROPSY, 9.v. Hydro salt, (hi'dro-sault.) (Chem.) A salt resulting from the union ofa hydra cid with a base. Hydrostatic Balance, (hi-dro-stat'ik-.) See BALANCE. Hydrostatic Pre . Same as HYDRAULIC PRESS,q.v. Hydrostatics, (-stať'iks.) [From Gr. hydōr, and stao, Istand. The science of equilibrium of liquids, and of other bodies (especially solids) in the maintenance of whose equilibrium liquids are concerned. Hydrosulphuric Acid. (Chem.) See SULPHURETTED HYDROGEN. Hyenn,(hi-enah,)or HYENA. (Zool.) A carnivorous animal, of which there are three species comprising the fam. Hyenade,characterized by having no tuberculous teeth or small teeth behind the carnivorous. The neck of the H. is very thick, and covered with a kind of bristles instead of hairs, which naturally stand erect, and give it a very formidable ap-Fig. 399. -SPOTTED HYENA. pea rance; the body is bulky and rounded, and the shape not unlike that of a hog; the legs are moderately long and very strong; and the general color is a very dusky olive. It inhabits Turkey, Syria, Persia, and Barbary, living in caverns and rocky places, and prowling about at night to feed on the remains of dead animals. The StripedH., orH. vulgar is of E. Africa, is not very swift, but continually lies in wait for other animals, and scarce anything that comes in its way escapes it. The SpottedH., or H. crocutis (Fig. 399), of S. Africa, much resembles the former species, but is marked with numerous round blackish-brown spots instead of stripes. / (e-air',) a town of France,'dep. Var, 8 m. E. of Toulon, near the Mediterranean coast. It is much resorted to by invalids on account of its mild and salubrious climate. Pop. 10,878. [Gr. hye tos, rain, and gra pho, I describe.] (Meteor.) A rain-gauge. See PLUVIOMETER. (hi-je'yah.) (Myth.) The godde of health, and reputed daughter of Asclepias, represented as holding in one hand a cup in the act of drinking therefrom, and in the other a serpent. (hi'je-en.) [Fr., from Gr. hygeira, health.] (Med.) That dept. of medical science which has reference to the means of preserving the public health. (hi-grol'o-je.) [From Gr. hy gros, humid, and logos, speech.] (Med.) The doctrine of the bodily fluids or humors. (hi-grom'e-tur.) [From Gr. hy gros, moist, and me tron, measure.] (Meteor.) An instrument for measuring the hygrometric state of the air, of which there are several varieties - chemical H., condensing H., and psychrometers. The method of the chemical H. consists in pa ing a known volume of air over a substance which readily absorbs moisture chloride of calcium, for instance. The substance having been weighed before the pa age of the air, and then afterwards, the increase in weight represents the amount of aqueous vapor present in the air. By means of the apparatus represented inFig. 400, it is po ible to examine any given volume. Two bra reservoirs A and B, of the same size and construction, act alternately as aspirators, by being fixed to the same axis, about which they can turn. They are connected by a central tubulure; and by means of two tubulures in the axis the lower reservoir is always in connection with the atmosphere, while the upper one, by means of a caoutchouc tube, is connected with the tubes M and N, filled either with chloride of calcium, or with pumice stone impregnated with sulphuric acid. The first absorbs the vapor in the air drawn through, while the other, M, stops any vapor which might diffuse from the reservoirs to the tube N. The lower reservoir being full of water, and the upper one of air, the apparatus is inverted so that the liquid flows slowly from A to B. A vacuum being formed in A, air enters by the tubes [s. 471] IMG:p0516_0.jpg:Gravür