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ray, 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 biv…

The common name of the several species of the genus Parietaria, low, harmless weeds of the Nettle family; -- also called wall pellitory, and lichwort.

Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.

ch also serves to support them upright in the mud. See Pennatula, and Illust. under Alcyonaria.

A European trailing herb (Linaria Cymbalaria) with roundish, reniform leaves. It is often cultivated in hanging baskets. March, or Water, pennywort. (Bot.) See under March.

The common pillwort of Europe (Pilularia globulifera). See Pillwort.

Among Trinitarians, one of the three subdivisions of the Godhead (the Father, the Son, and the Holy Ghost); an hypostasis. "Three persons and one God." Bk. of Com. Prayer.

trees of various species of Cinchona. It acts as a powerful tonic, and is a remedy for malarial diseases. This property is due to several alkaloids, as quinine, cinchonine, etc., and their compounds; -- called also Jesuit's bark, and cinchona. See Cinchona.

. The small petrels, or Mother Carey's chickens, belong to Oceanites, Oceanodroma, Procellaria, and several allied genera. Diving petrel, any bird of the genus Pelecanoides. They chiefly inhabit the southern hemisphere. -- Fulmar petrel, Giant petrel. See Fulmar. -- Pintado petrel, the Cape pigeon. See under Cape. -…

equilibrium, discovered by Prof. J. Willard Gibbs. It may be stated thus: The degree of variableness (number of degrees of freedom) of a system is equal to the number of components minus the number of phases, plus two. Thus, if the components be salt and water, and the phases salt, ice, saturated solution, and vapor,…

ing essentially of an electric arc and a camera, by which a series of photographs of the variations of the arc due to sound waves are obtained for reproduction by means of a selenium cell and a telephone.

A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

A branch of a plumularian hydroid specially modified in structure for the protection of the gonothecæ.

The succession and variation of leaves during different seasons. R. Brown.

changes on the earth's surface, as the currents of the atmosphere and ocean, the secular variations in heat, moisture, magnetism, etc.; physical geography.

outsiders, and prevent them from working for employers with whom the organization is at variance. [Cant]

ese and Hindoostanee. Johnson's Cyc. -- Pigeon grass (Bot.), a kind of foxtail grass (Setaria glauca), of some value as fodder. The seeds are eagerly eaten by pigeons and other birds. -- Pigeon hawk. (Zoöl.) (a) A small American falcon (Falco columbarius). The adult male is dark slate-blue above, streaked with black…

A plant (Ranunculus Ficaria of Linnæus) whose tuberous roots have been used in poultices as a specific for the piles. Forsyth.

Any plant of the genus Pilularia; minute aquatic cryptograms, with small pill-shaped fruit; -- sometimes called peppergrass.

king a recess for the head of a bolt, etc.; a counterbore. -- Pin grass. (Bot.) See Alfilaria. -- Pin hole, a small hole made by a pin; hence, any very small aperture or perforation. -- Pin lock, a lock having a cylindrical bolt; a lock in which pins, arranged by the key, are used instead of tumblers. -- Pin money,…