PLYMOUTH BRETHREN, an anti-clerical body of Christians, one of the earliest communities of which was formed in Plymouth about 1830; they accept, along with Pre-Millenarian views, generally the Calvinistic view of the Christian religion, and exclude all unconverted men from their communion, while all included in the body are of equal standing, and enjoy equal privileges as members of Christ.  They appear to regard themselves as the sole representatives in these latter days of the Church of Christ, and as the salt of the earth, for whose sake it exists, and on whose decease it and its works of darkness will be burnt up.  They are known also by the name of Darbyites, from the name of one of their founders, a barrister, John Nelson Darby, an able man, and with all his exclusiveness a sincere disciple of Christ (1800-1882).

PNEUMONIA, name given to acute inflammation of the lungs.

PO, the largest river in Italy, rises 6000 ft. above sea-level in the Cottian Alps, and after 20 m. of rocky defiles emerges on the great Lombardy plain, which it crosses from W. to E., receiving the Ticino, Adda, Mincio, and Trebbia, tributaries, and enters the Adriatic by a rapidly growing delta.  Its total course is 360 m.; the width and volume of its stream make it difficult to cross and so a protection to all Italy.  The chief towns on its banks are Turin, Piacenza, and Cremona.

POCAHONTAS, the daughter of an Indian chief in Virginia, who favoured the English settlers there, saving the life of Captain Smith the coloniser, and afterwards married John Rolfe, one of the settlers; came to England, and was presented at Court; several Virginian families trace their descent to her.

POCKET BOROUGH, a borough in which the influence of some magnate of the place determines the voting at an election time, a thing pretty much of the past.

POCOCK, EDWARD, English Arabic and Hebrew scholar, born at Oxford, and occupied both the chairs of Arabic and Hebrew there, and left works in evidence of his scholarship and learning in both languages, quite remarkable for the time when he lived (1604-1691).

POCOCKE, RICHARD, English prelate, born at Southampton; travelled extensively, particularly in the East; wrote a description of the countries of the East and of others, among them “Tours In Scotland” and a “Tour in Ireland,” all deemed of value (1704-1765).

PODESTA, the name given to the chief magistrate of an Italian town, with military as well as municipal authority; he was salaried, and annually elected to the office by the council, and had to give an account of his administration at the end of his term.

PODIEBRAD, GEORGE, king of Bohemia; rose, though a Hussite, and in spite of the Pope, from the ranks of the nobles to that elevation; forced his enemies to come to terms with him, and held his ground against them till the day of his death (1420-1471).