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dentition

(Encyclopedia)dentition, kind, number, and arrangement of the teeth of humans and other animals. During the course of evolution, teeth were derived from bony body scales similar to the placoid scales on the skin of...

Olcott, Henry Steel

(Encyclopedia)Olcott, Henry Steel, 1832–1907, American religious leader and author, cofounder of Theosophist movement, b. Orange, N.J. After working as an agricultural scientist and a lawyer, he and Helena Blavat...

Leopold, Aldo

(Encyclopedia)Leopold, Aldo, 1886–1948, American ecologist, b. Burlington, Iowa. He was an advocate for a “land ethic,” in which humans see themselves as part of a natural community. After work in the U.S. Fo...

Servile Wars

(Encyclopedia)Servile Wars, name given in Roman history to three slave uprisings. The agricultural slaves were exploited by their owners, who had extreme powers and were never averse to using them. The first of the...

Stone, Lucy

(Encyclopedia)Stone, Lucy, 1818–93, reformer and leader in the women's rights movement, b. near West Brookfield, Mass., grad. Oberlin, 1847. In 1847 she gave her first lecture on women's rights, and the following...

Jackson Hole

(Encyclopedia)Jackson Hole, fertile Rocky Mt. valley, c.50 mi (80 km) long and 6 to 8 mi (9.6–12.8 km) wide, NW Wyo., partly in Grand Teton National Park. Jackson Lake, 39 sq mi (101 sq km), a natural lake throug...

endangered species

(Encyclopedia)endangered species, any plant or animal species whose ability to survive and reproduce has been jeopardized by human activities. In 1999 the U.S. government, in accordance with the U.S. Endangered Spe...

Kidd, William

(Encyclopedia)Kidd, William, 1645?–1701, British privateer and pirate, known as Captain Kidd. He went to sea in his youth and later settled in New York, where he married and owned property. In 1691 he was rewarde...

Esch, John Jacob

(Encyclopedia)Esch, John Jacob ĕsh [key], 1861–1941, U.S. Congressman and federal administrator, b. Norwalk, Wis. A lawyer in La Crosse, he became a member of the House of Representatives in 1899 and served unti...

Grosvenor, Gilbert Hovey

(Encyclopedia)Grosvenor, Gilbert Hovey hŭvˈē grōvˈnər [key], 1875–1966, American editor, b. Constantinople, Turkey. As director (1903–1919) and later as president (1920–54) of the National Geographic So...