Plotinus
a founder of the Neo-Platonic school; was born in Lycopolis, Egypt, A. D. 203. He was trained in the school of Alexandria, under Ammonius Saccas, then visited the East, and about 244 settled at Rome, where he spent the rest of his life as a teacher and writer. Porphyry, his most eminent disciple, wrote his life, and arranged and published his works, divided into six sets of nine books each ("Enneads"). Plotinus was profound a thinker and a deeply religious man, and his system, a sort of mystical idealism, a combination of Platonic with Oriental notions. He died in Campania, in 270.
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Plowman
Piers. See Langland
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Plumbago
. See Graphite
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Plumber's Solder
Solder for lead is composed of tin 1, lead 1 1/2; flux with tallow or rosin. For tin: tin 1, lead 2; flux with rosin and sweet-oil. A useful solder for general purposes is made from lead 5, tin 3, bismuth 1. See SOLDERING; SOLDERS.
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Plunkett
SIR HORACE CUR- ZON, an Irish leader, born in 1854 of a noble family, he attended both Eton and Oxford University. Soon after graduating from Oxford he went to a ranch in Montana and lived there ten years, gaining that sympathetic understanding of the farmer's needs that has distinguished his work for Ireland. In 1894, after his return to Ireland he founded the Irish Agricultural Organization Society which has accomplished a great work for Irish Agriculture. From 1892 to 1900 he was a Unionist member of Parliament, serving most of the time on Commissions having to do with Irish affairs. Lukewarm at first toward the cause of Irish Home Rule, Sir Horace finally became an exponent onent of it in 1914. He presided over the convention called by the Prime Minister in 1917 and wrote the majority report. He has recently espoused the cause of a Dominion government for Ireland.
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Plutarchus
The celebrated biographer, was born at Chaeronea , his father being distinguished for his learning and virtues. After traveling in quest of knowledge, he retired to Rome, where he opened a school. Subsequently he removed to Chaeronea, where he died at an advanced age about the 140th year of the Christian era. His most esteemed work is the Lives of Illustrious Men. 2026 Editor's Note: Plutarch lived before AD 50 to after 120, not until the 140th year of the Christian era as stated in the page text. Beyond his celebrated biographical works, he held the distinguished role of priest at the Temple of Apollo in Delphi, a position that connected him to one of antiquity's most important religious centers. (Ed: BR 2026-07-15)
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Pluto
in mythology, the son of port second only safe anchorage Saturn and Ops, inherited his father's secure a stupendous breakwater has been con- . kingdom with his brothers, Jupiter and structed at a cost of about $10,000,000 Neptune. He received as his share the infernal regions. All the goddesses refused to marry him; but, on seeing Proserpine, the daughter of Ceres, gathering flowers in the plains of Enna, in Sicily, , and immehe became enamored of her diately carried her away. Black victims, and particularly a bull, were the only sacrifices offered to him. The dog Cerberus watched at his feet, the harpies hovered around him, Proserpine sat on his left, and the Parcæ occupied his by some the right hand. Pluto is called father of the Eumenides.
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Plutonic Rocks
rocks of igneous or aqueo-igneous origin, believed to have 179,395. been formed at a great depth and under superincumbent great pressure of the rocks, or in some cases, perhaps, of the ocean. They have been melted, and of Plymouth co., Bay, and on the New York, cooled very slowly so as to permit them plutonic rocks to crystallize. Under the are comprehended granites, syenites, and some porphyries, diorite, tonalite, and leading gabbro. They belong to all the geological periods, even the Tertiary.
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Pluviose
the name adopted, in October, 1793, by the French Convention republican for the fifth month of the It commenced on Jan. 20, and was year. the second winter month.
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Plymouth
. See Pilgrims
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Plymouth
a borough of Pennsylvania, in Luzerne co. It is on the Susquehanna river and on the Delaware, Western railroad. It is the center of an important coal mining region. Its industries include the manufacture of mining drill machines, hosiery, silk, lumber products, etc. Pop. (1910) 16,996; (1020) 16,500.
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Plymouth (Town and county-seat Mass)
a town and county-seat Mass .; on Plymouth York, New Haven, and Hartford railroad; 37 miles S. E. of Boston. The town has electric lights, water works, electric street railroads, , National and court house, public library daily and savings banks, and several weekly newspapers. It has a large industry in cod fish, and manufactures of cordage, cotton, ducks, woolen and cotton products, coopgoods, zinc, steel and iron erage, etc. Plymouth is of importance as the spot where the Pilgrim Fathers landed on Dec. 21, 1620. A portion of has the rock on which they first stepped been placed in front of Pilgrim Hall, in which are preserved old books, paintings, pictures, and other valuable relics. The rock itself is in Water Street, and is covered by a handsome granite te canopy. Plymouth also has the National monument, 81 feet high, erected to the Pilgrims at a cost of $200,000, and dedicated in 1889. There are also statues of and Ed- Faith, Morality, Law, Freedom, ; (1920) ucation. Pop. (1910) 12,141
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Plymouth Rock
PLYMOUTH, MASS. Keystone View Company
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Plymouth Sound
an arm of the sea, on the S. W. coast of England, between the counties of Devon and Cornwall. It is about 3 miles wide at its entrance, bounded by elevated land, which descends abruptly to the sea. It contains Drake Island, which is fortified, and the celebrated Plymouth breakwater. See PLYMOUTH.
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Pneumatic Clock
One of a series of clocks governed by pulsations of air, sent to them at regular intervals through tubes which are controlled and operated by a master clock. Repeating clock. The mechanism by which a clock or watch may be made to strike the hours and minutes by pulling or pushing a cord or rod, so as to tell the time without looking at the dial, was invented in 1676 by Wm. Derham. It immediately became popular, and the idea was taken up by many English, French and German horologists. It was at first applied only to clocks, but was subsequently put into watches as well, and forms the origin of the repeating watches of the present day.
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