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The change of one mineral species to another, so as to involve a change in physical characters without alteration of chemical composition.

Of or pertaining to a change from the right form, as in the formation of a word from another by a change of termination, gender, etc. Max Müller.

ints all in the same plane; -- said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used.

nce, specifically, to confer orally with an enemy; to treat with him by words, as on an exchange of prisoners, an armistice, or terms of peace. They are at hand, To parley or to fight; therefore prepare. Shak.

To move or be transferred from one state or condition to another; to change possession, condition, or circumstances; to undergo transition; as, the business has passed into other hands. Others, dissatisfied with what they have, . . . pass from just to unjust. Sir W. Temple.

to whom, or to whose order, the amount is promised or directed to be paid. See Bill of exchange, under Bill.

A set of bells tuned to each other according to the diatonic scale; also, the changes rung on a set of bells. To ring a peal. See under Ring.

To congeal; to change into a gelatinous mass. [R.] H. Spencer.

heard on applying the ear to the chest in auscultation. It usually indicates some morbid change in the lungs or pleural cavity.

ingle event, or act; hence, a limit; a bound; an end; a conclusion. Bacon. So spake the archangel Michael; then paused, As at the world's great period. Milton. Evils which shall never end till eternity hath a period. Jer. Taylor. This is the period of my ambition. Shak.

Continuing in the same state, or without any change that destroys form or character; remaining unaltered or unremoved; abiding; durable; fixed; stable; lasting; as, a permanent impression. Eternity stands permanent and fixed. Dryden. Permanent gases (Chem. & Physics), hydrogen, oxygen, nitrogen, and carbon monoxide; --…

Capable of being permuted; exchangeable. -- Per*mut"a*ble*ness, n. -- Per*mut"a*bly, adv.

The act of permuting; exchange of the thing for another; mutual transference; interchange. The violent convulsions and permutations that have been made in property. Burke.

To interchange; to transfer reciprocally.

ive nature; personal remarks; as, indulgence in personalities. Sharp personalities were exchanged. Macaulay.

g perverted; a turning from truth or right; a diverting from the true intent or object; a change to something worse; a turning or applying to a wrong end or use. "Violations and perversions of the laws." Bacon.

A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form of enlightened disk; as, the phases of the moon or planets. See Illust. under Moon.

in water or in plant juices. -- Reverted phosphoric acid (Agric. Chem.), phosphoric acid changed from acid (soluble) salts back to neutral or basic (insoluble) salts.

Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina.

The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography.