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r result of exchange, substitution, or replacement of atoms and radicals; thus, by metathesis an acid gives up all or part of its hydrogen, takes on an equivalent amount of a metal or base, and forms a salt.

The passage of the soul, as an immortal essence, at the death of the animal body it had inhabited, into another living body, whether of a brute or a human being; transmigration of souls. Sir T. Browne.

suppression of the bissextile day once in 134 years. The opposite to this is the proemptosis, or the addition of a day every 330 years, and another every 2,400 years.

The assimilation by one body or organism of the elements of another.

Analysis of the structure of materials from careful observation of photomicrographs.

Imitation; mimicry.

A mistress; a wife; -- so used by the illiterate. G. Eliot.

Like a miss; prim; affected; sentimental. -- Miss"ish*ness, n.

See Karyokinesis.

ol.), development of all beings in the universe from a single cell; -- opposed to polygenesis. Called also monism. Dana. Haeckel.

Idiocy; fatuity; stupidity.

The order or mode of development of an organ or part.

A long-continued or excessive dilatation of the pupil of the eye.

The appearance of muscæ volitantes. See Muscæ volitantes, under Musca.

Long-continued contraction of the pupil of the eye.

A genus of small schizopod shrimps found both in fresh and salt water; the opossum shrimps. One species inhabits the Great Lakes of North America, and is largely eaten by the whitefish. The marine species form part of the food of right whales.

Privation of sense or consciousness, due to a narcotic.

The death of a part by molecular disintegration and without loss of continuity, as in the processes of degeneration and atrophy. Virchow.

Mortification or gangrene of bone, or the death of a bone or portion of a bone in mass, as opposed to its death by molecular disintegration. See Caries.

, retributive justice personified; divine vengeance. This is that ancient doctrine of nemesis who keeps watch in the universe, and lets no offense go unchastised. Emerson.