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Poland, partitions of
(Encyclopedia)Poland, partitions of. The basic causes leading to the three successive partitions (1772, 1793, 1795) that eliminated Poland from the map were the decay and the internal disunity of Poland and the eme...polarization of light
(Encyclopedia)polarization of light, orientation of the vibration pattern of light waves in a singular plane. Unpolarized light can be converted into a single polarized beam by means of the Nicol prism, a device ...Port of Spain
(Encyclopedia)Port of Spain, city (1990 pop. 50,878), capital of Trinidad and Tobago, on the Gulf of Paria. It is the industrial and commercial center of the country. From 1958 to 1962, Port of Spain was the capita...Portsmouth, Treaty of
(Encyclopedia)Portsmouth, Treaty of, 1905, treaty ending the Russo-Japanese War. It was signed at the Portsmouth Naval Base, New Hampshire, on Sept. 5, 1905. Negotiations leading up to the treaty began in the sprin...Pittsburgh, University of
(Encyclopedia)Pittsburgh, University of, main campus at Pittsburgh; private with some state support; coeducational; chartered and opened as an academy 1787, called Western Univ. of Pennsylvania 1819–1908. It oper...plagues of Egypt
(Encyclopedia)plagues of Egypt, in the Bible, the plagues and other troubles brought on Egypt by God through the hands of Moses, because Pharaoh would not let the people of Israel go out of Egypt. The account, in t...Plain of Jars
(Encyclopedia)Plain of Jars, region, N Laos, at the northern end of the Annamese Cordillera. Over 300 carved stone jars, c.1,500 to 2,000 years old, are scattered across its landscape. Averaging 272 lbs (600 kg), t...Plains of Abraham
(Encyclopedia)Plains of Abraham: see Abraham, Plains of. ...plaster of Paris
(Encyclopedia)plaster of Paris: see gypsum.Pledge of Allegiance
(Encyclopedia)Pledge of Allegiance, in full, Pledge of Allegiance to the Flag of the United States of America, oath that proclaims loyalty to the United States. and its national symbol. It reads: “I pledge allegi...Browse by Subject
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