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rl gray, a very pale and delicate blue-gray color. -- Pearl millet, Egyptian millet (Penicillaria spicata). -- Pearl moss. See Carrageen. -- Pearl moth (Zoöl.), any moth of the genus Margaritia; -- so called on account of its pearly color. -- Pearl oyster (Zoöl.), any one of several species of large tropical marine…

and so ascertaining the distance passed over. It is usually in the form of a watch; an oscillating weight by the motion of the body causes the index to advance a certain distance at each step.

Any Australian kangaroo of the genus Petrogale, as the rock wallaby (P. penicillata).

s species of small singing birds belonging to Anthus and allied genera, of the family Motacillidæ. They strongly resemble the true larks in habits, colors, and the great length of the hind claw. They are, therefore, often called titlarks, and pipit larks.

k motion, regularly repeated, as of a medium in the transmission of light, sound, etc.; oscillation; vibration; pulsation; impulse; beat; movement. The measured pulse of racing oars. Tennyson. When the ear receives any simple sound, it is struck by a single pulse of the air, which makes the eardrum and the other membra…

pus from old sores, supposed to be formed through the agency of a species of bacterium (Bacillus pyocyaneus).C13H10N2O

A small, handsome European singing bird (Ruticilla phoenicurus), allied to the nightingale; -- called also redtail, brantail, fireflirt, firetail. The black redstart is P.tithys. The name is also applied to several other species of Ruticilla amnd allied genera, native of India.

A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.

An oscillating bar in a machine, as the lever of the bellows of a forge.

The oscillating movement of a vessel from side to side, in sea way, as distinguished from the alternate rise and fall of bow and stern called pitching.

tinuous rotary motion, as by means of a connecting rod, a working beam and crank, or an oscillating cylinder.

which has white shoulders, head, rump, and tail; the European white-tailed eagle (H. albicilla); and the Indian white- tailed sea eagle, or fishing eagle (Polioaëtus ichthyaëtus). The bald eagle and the osprey are also sometimes classed as sea eagles.

Local oscillations in level observed in the case of some lakes, as Lake Geneva.

ignal telegraph; an apparatus for giving signals by the disposition of lanterns, flags, oscillating arms, etc.

The act or result of shaking; a vacillating or wavering motion; a rapid motion one way and other; a trembling, quaking, or shivering; agitation. The great soldier's honor was composed Of thicker stuff, which could endure a shake. Herbert. Our salutations were very hearty on both sides, consisting of many kind shakes of…

A disruptive discharge between a conductor traversed by an oscillatory current of high frequency (as lightning) and neighboring masses of metal, or between different parts of the same conductor.

The formation of reproductive cells or spores, as in the growth of bacilli.

The act or process of forming spores; spore formation. See Illust. of Bacillus, b.

A European bulbous liliaceous plant (Urginea, formerly Scilla, maritima), of acrid, expectorant, diuretic, and emetic properties used in medicine. Called also sea onion.

One who paints or colors in figures by means of stencil. [Written also stenciller.]