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Rh chequered by weariness and sorrow. In 1825 he retired to Neuhof, the home of his youth; and after writing the adventures of his life, and his last work, the Swan's Song, he died at Brugg on the 17th of February 1827. As he said himself, the real work of his life did not lie in Burgdorf or in Yverdun. It lay in the principles of education which he practised, the development of his observation, the training of the whole man, the sympathetic application of the teacher to the taught, of which he left an example in his six months' labours at Stanz. He had the deepest effect on all branches of education, and his influence is far from being exhausted.

PETALITE, a mineral species consisting of lithium aluminium silicate, LiAl(Si2O5)2. The monoclinic crystals approach (q.v.) in form, which is also a lithium aluminium silicate with the formula LiAl(SiO3)2. There is a perfect cleavage parallel to the basal plane, and the mineral usually occurs in platy cleavage masses; on this account it was named, from Gr. (a leaf). The hardness is 6½ and the specific gravity 2.4 (that of spodumene being 3.16). The mineral is colourless or occasionally reddish, varies from transparent to translucent, and has a vitreous lustre. It was discovered in 1800 as cleavage masses in an iron mine on the island of Utö in the Stockholm archipelago, where it is associated with lepidolite, tourmaline (rubellite and indicolite) and spodumene. A variety known as &ldquo;castor&rdquo; is found as transparent glassy crystals associated with (q.v.) in cavities in the granite of Elba.

PETARD (Fr. pétard, péter, to make a slight explosion), a device formerly used by military engineers for blowing in a gate or other barrier. It consisted of a small metal or wooden case, usually of sugar-loaf shape, containing a charge of powder and fired by a fuse.

PETAU, DENYS (1583-1652), Jesuit scholar, better known as, was born at Orleans on the 21st of August 1583. Educated at Paris University, he came under the influence of Isaac Scaliger, who directed his attention towards the obscurer fathers of the Church. In 1603 he was appointed to a lectureship at the university of Bourges, but resigned his place two years later, in order to enter the Society of Jesus. For many years he was professor of divinity at the College de Clermont, the chief Jesuit establishment in Paris; there he died on the 11th of December 1652. He was one of the most brilliant scholars in a learned age. Carrying on and improving the chronological labours of Scaliger, he published in 1627 an Opus de doctrine temporum, which has been often reprinted. An abridgment of this work, Rationarzurn temporum, was translated into French and English, and has been brought down in a modern reprint to the year 1849. But Petau's eminence chiefly rests on his vast, but unfinished, De tlzeologieis dogmattbus, the first systematic attempt ever made to treat the development of Christian doctrine from the historical point of view.

PETCHENEGS, or, a barbarous people, probably of Turkish race, who at the end of the 9th century were driven into Europe from the lower Ural, and for about 300 years wandered about the northern frontier of the East Roman Empire (See ).

PETER (Lat. Petrus from Gr., a rock, Ital. Pietro, Piero, Pier, Fr. Pierre, Span. Pedro, Ger. Peter, Russ. Petr), a masculine name, derived from the famous surname bestowed by Christ upon his apostle Simon (“Thou art Peter and upon this rock will I build my church,” Matt. xiv. 17-19). The name has consequently been very popular in Christian countries. It is noteworthy, however, that, out of deference to the “prince of the apostles” and first bishop of Rome, the name has never been assumed by a pope The biographies which follow are arranged in the order (1) the apostle, (2) kings; (3) other eminent men

PETER, ST, the chief of the Twelve Apostles. He is known also by other names (a) “Simon” in Mark four times and Luke seven times. This use is only found in narrative before the story of the mission of the apostles it is also found in speeches; Matthew once, Mark once and Luke twice (b) “Simon who is called Peter” is found in Matthew twice and Acts four times. (c) “Simon Peter” is found in Matthew once, Luke once, John seventeen times (and perhaps also in 2 Peter i 1, where the text varies between Simon and Symeon. (d) “Peter” is found in Matthew nineteen times, Mark eighteen times, Luke sixteen times, Acts fifty-one times, John fifteen times, Galatians twice, 1 Peter once (e) “Cephas” is found in John once, Galatians four times, 1 Corinthians four times. (f) Symeon is found in Acts once. It appears that the apostle had two names, each existing in a double form—Greek and Hebrew, Symeon (שמעח) which was Graecized according to the sound into Simon, and Cephas (כיפ֛א) which was Graecized according to the meaning into Peter . Symeon and Simon are both well-known names in Aramaic and Greek respectively, but Cephas and Peter are previously unknown. Symeon was no doubt his original Aramaic name, and the earliest gospel, Mark, which has some claim specially to reproduce Petrine tradition, is careful to employ Simon until after the name Peter had been given, and not then to use it again. The Gospels agree in regarding Cephas or Peter as an additional name, which was given by Christ. But they differ as to the occasion. According to Mark iii 13 sqq it was given on the occasion of the mission of the Twelve. According to John i. 42 it was given at his first call. According to Matt. xvi. 13 sqq it was given after the recognition of Jesus as Messiah at Caesarea Philippi. This last account is the only one which describes any circumstances (for a further discussion see § 3 (2) below).

According to the Gospels Peter was the son of John (', John i 42, xxi. 15 seq) or Jonas (, Matt. xxvi. 17). According to Mark i. 29 he was a fisherman of Capernaum, but John i. 44 describes him and his brother Andrew as of Bethsaida. From Mark i. 30 he is seen to have been married, and 1 Cor. ix. 5 suggests (but another interpretation is possible) that his wife went with him on his missionary journeys. In 1 Pet. v. 13 Mark is referred to as his son, but this is usually interpreted of spiritual kinship. According to legend (Acta Nerei et Achillei, and Acta Philippi) he had a daughter Petronilla, but there is no reason for thinking that this is historical.

The Gospel narratives are unanimous in describing Peter as one of the first disciples of Christ, and from the time of his call he seems to have been present at most of the chief incidents in the narrative. He formed together with the sons of Zebedee to some extent an inner circle within the Twelve, and this favoured group is specially mentioned as present on three occasions—the raising of the daughter of Jairus (Mark v. 22-43; Matt. ix. 18-36; Luke viii. 41-56), the transfiguration (Mark ix. 2 sqq; Matt. xv1i. 1 sqq.; Luke ix. 28 sqq.) and the scene in the Garden at Gethsemane (Mark xiv. 32 sqq.; Matt. xxvi. 36 sqq). He is also specially mentioned in connexion with his call (Mark i. 16-20; Matt. iv. 18 sqq; Luke v. 1 sqq.; John i. 40 sqq); the healing of his wife's mother (Mark i. 21 sqq; Matt. viii. 14 sqq; Luke iv. 38 sqq); the mission of the Twelve Apostles (Mark iii. 13 sqq; Matt. x. 1 sqq.; Luke vi. 12 sqq); the storm on the Lake of Galilee (Mark vi. 45 sqq.; Matt. xiv. 22 sqq.; John vi. 16 sqq.); the Messianic recognition at Caesarea Philippi (Mark vi1. 27 sqq.; Matt. xvi. 16 sqq; Luke ix. 18 sqq); the incident of the payment of tribute by the coin found in the fish caught by Peter (Matt. xvii 25 sqq.) and with various questions leading to parables or their explanations (Mark xiii. 36 sqq.; Luke xii. 41; Matt. xviii. 21 sqq; Mark x. 28; Matt. xix. 27; Luke xviii. 28). In the week of the Passion he appears in connexion with the incident of the withered fig-tree (Mark xi. 21; Matt. xxi. 20); as introducing the eschatological discourse (Mark xiii 3 sqq); and as prominent during the Last Supper (Luke xxii 8 sqq.; John xiii 4 sqq; Mark xiv. 27 sqq.; Matt. xxvi. 31 sqq). He