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biological diversity

(Encyclopedia)biological diversity or biodiversity, the number of species in a given habitat. Scientists have variously estimated that there are from 3 to 30 million extant species, of which 2.5 million have been c...

Tennessee, river, United States

(Encyclopedia)Tennessee, river, c.650 mi (1,050 km) long, the principal tributary of the Ohio River. It is formed by the confluence of the Holston and French Broad rivers near Knoxville, Tenn., and follows a U-shap...

Tillman, Benjamin Ryan

(Encyclopedia)Tillman, Benjamin Ryan, 1847–1918, U.S. Senator from South Carolina (1895–1918), b. Edgefield co., S.C. A farmer, he became the leader of the backcountry whites in South Carolina and fostered thei...

St. Clair, Arthur

(Encyclopedia)St. Clair, Arthur, 1734–1818, American general, b. Thurso, Scotland. He left the Univ. of Edinburgh to become (1757) an ensign in the British army and served in the French and Indian War at Louisbur...

Péguy, Charles

(Encyclopedia)Péguy, Charles shärl pāgēˈ [key], 1873–1914, French poet and writer. Of a poor, working family, he won scholarships and made a brilliant record as a student. He left the École normale supérie...

Villa, Francisco

(Encyclopedia)Villa, Francisco fränsēsˈkō vēˈyä [key], c.1877–1923, Mexican revolutionary, nicknamed Pancho Villa. His real name was Doroteo Arango. When Villa came of age, he declared his freedom from the...

Monroe Doctrine

(Encyclopedia)Monroe Doctrine, principle of American foreign policy enunciated in President James Monroe's message to Congress, Dec. 2, 1823. It initially called for an end to European intervention in the Americas,...

Conrad IV, ruler of the Holy Roman Empire

(Encyclopedia)Conrad IV, 1228–54, German king (1237–54), king of Sicily and of Jerusalem (1250–54), son of Holy Roman Emperor Frederick II. He was elected (1237) king of the Romans at his father's instigation...

Wessex

(Encyclopedia)Wessex wĕsˈĭks [key], one of the Anglo-Saxon kingdoms in England. It may have been settled as early as 495 by Saxons under Cerdic, who is reputed to have landed in Hampshire. Cerdic's grandson, Cea...

Reynolds, Sir Joshua

(Encyclopedia)Reynolds, Sir Joshua, 1723–92, English portrait painter, b. Devonshire. Long considered historically the most important of England's painters, by his learned example he raised the artist to a positi...