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Riley, Bridget

(Encyclopedia)Riley, Bridget, 1931–, English painter. Associated with the pop art movement, Riley covers large canvases with interlocking bands, undulating curves, scattered discs, or repeated squares or triangle...

Field, Eugene

(Encyclopedia)Field, Eugene, 1850–95, American poet and journalist, b. St. Louis. After working on several Midwestern newspapers, in 1883 he became a columnist for the Chicago Daily News (later the Record). His u...

Beke, Charles Tilstone

(Encyclopedia)Beke, Charles Tilstone bēk [key], 1800–1874, English explorer and author. In Ethiopia in 1840–43 he mapped c.70,000 sq mi (181,300 sq km) of the country, determined the approximate course of the ...

van Dyke, Henry

(Encyclopedia)van Dyke, Henry, 1852–1933, American clergyman, educator, and author, b. Germantown, Pa., grad. Princeton, 1873, and Princeton Theological Seminary, 1874. He was pastor of the Brick Presbyterian Chu...

apatite

(Encyclopedia)apatite ăpˈətīt [key], mineral, a phosphate of calcium containing chlorine or fluorine, or both, that is transparent to opaque in shades of green, brown, yellow, white, red, and purple. Apatite is...

heartwood

(Encyclopedia)heartwood, the central, woody core of a tree, no longer serving for the conduction of water and dissolved minerals; heartwood is usually denser and darker in color than the outer sapwood. Before the s...

Strauss, Levi

(Encyclopedia)Strauss, Levi, 1829–1902, American merchant, b. Buttenheim, Germany, as Löb Strauss. He moved with his mother and sisters to New York City in 1847 to join his brothers' wholesale dry-goods company....

Sommer, William

(Encyclopedia)Sommer, William, 1867–1949, American painter and lithographer, b. Detroit. He was apprenticed as a lithographer and studied drawing with Julius Melchers in Detroit and drawing and painting in Munich...

Bruce, James

(Encyclopedia)Bruce, James, 1730–94, Scottish explorer in Africa. He explored Roman ruins in N Africa (1755) from Tunis to Tripoli and visited Crete, Rhodes, and Asia Minor. In 1768 he traveled down the Red Sea a...

Wad Madani

(Encyclopedia)Wad Madani wäd mädäˈnē [key], city (1993 pop. 211,362), SE cental Sudan, on the Blue Nile River. It is linked by rail with Khartoum and is the chief center of the Al Gezira agricultural region. C...