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is connected with a rudimentary eye, the so-called pineal eye, and in other animals it is supposed to be the remnant of a dorsal median eye.

An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.

e upon which the object which is to be delineated, or whose place is to be determined, is supposed to stand. -- Perspective plane. See Perspective. -- Plane at infinity (Geom.), a plane in which points infinitely distant are conceived as situated. -- Plane iron, the cutting chisel of a joiner's plane. -- Plane of p…

That state in which every part of space is supposed to be full of matter; -- opposed to vacuum. G. Francis.

er pressure. -- Plutonic rocks (Geol.), granite, porphyry, and some other igneous rocks, supposed to have consolidated from a melted state at a great depth from the surface. Cf. Intrusive rocks, under Intrusive. -- Plutonic theory. (Geol.) See Plutonism.

An indefinitely small space; a mere spot indicated or supposed. Specifically: (Geom.) That which has neither parts nor magnitude; that which has position, but has neither length, breadth, nor thickness, -- sometimes conceived of as the limit of a line; that by the motion of which a line is conceived to be produced.…

. balsamifera) found in the West Indies, from the trunk of which a black liquor distills, supposed to have poisonous qualities. (b) The poison sumac (Rhus venenata). [U. S.] -- Poison dogwood (Bot.), poison sumac. -- Poison fang (Zoöl.), one of the superior maxillary teeth of some species of serpents, which, besides h…

A cup that was supposed to break on having poison put into it.

Any imagined frightful object, especially one supposed to haunt the darkness; a bugbear. [Colloq. U. S.]

e pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.

A supposed new element, a radioactive substance discovered by M. and MMe. Curie in pitchblende. It is closely related chemically to bismuth. It emits only alpha rays and is perhaps identical with radium F.

The open sea supposed to surround the north pole. Kane.

A figure supposed to resemble an apple; a roundel, -- always of a green color.

A brownish red approaching maroon, supposed to be imitated from the color of the wall panels of houses in Pompeii, which were decorated during the last age of the Republic.

A medicine supposed to promote the formation of callus.

The radical KO, derived from, and supposed to exist in, potassium hydroxide and other compounds.

See Blister beetle, under Blister. -- Potato rot, a disease of the tubers of the potato, supposed to be caused by a kind of mold (Peronospora infestans), which is first seen upon the leaves and stems. -- Potato weevil (Zoöl.), an American weevil (Baridius trinotatus) whose larva lives in and kills the stalks of potat…

One of the furs; a surface composed of patches which are supposed to represent crutch heads; they are always alternately argent and azure, unless otherwise specially mentioned. Counter potent (Her.), a fur differing from potent in the arrangement of the patches.

a distinction, but no opposition, between theory and practice; each, to a certain extent, supposes the other; theory is dependent on practice; practice must have preceded theory. Sir W. Hamilton.

are pasted by Buddhist priests, who then put the wheel in rapid revolution. Each turn in supposed to have the efficacy of an oral repetition of all the prayers on the wheel. Sometimes it is moved by a stream.