among the Greeks and Romans, a subterraneous place, where was a furnace to heat the baths. The word is Greek, formed of the preposition υπο under; and the verb καυσιν, to burn.—Another sort of hypocaustum was a kind of kiln to heat their winter parlours. The remains of a Roman hypocaustum, or heating-room, were discovered underground at Lincoln in 1739. We have an account of these remains in the Philosophical Transactions, n° 461. § 29.—Among the moderns, the hypocaustum is that place where the fire is kept which warms a stove or hot-house.

HYPOCHÆRIS, hawk’s-eye, in botany: A genus of the polygamia æqualis order, belonging to the syngenesia class of plants; and in the natural method ranking under the 49th order, Compositæ. The receptacle is paleaceous; the calyx a little imbricated; the pappus glumy. There are four species; none of which have any remarkable property, except the maculata, or spotted hawk’s-eye. It is a native of Britain, and grows on high grounds. The leaves are oblong, egg-shaped, and toothed; the stem almost naked, generally with a single branch; the blossoms yellow, opening at