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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...

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...

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 ...

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...

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...

waltz

(Encyclopedia)waltz, romantic dance in moderate triple time. It evolved from the German Ländler and became popular in the 18th cent. The dance is smooth, graceful, and vital in performance. The waltz in Vicente Ma...

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...

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...

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....