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oyster

(Encyclopedia)oyster, bivalve mollusk found in beds in shallow, warm waters of all oceans. The shell is made up of two valves, the upper one flat and the lower convex, with variable outlines and a rough outer surfa...

hydrology

(Encyclopedia)hydrology, study of water and its properties, including its distribution and movement in and through the land areas of the earth. The hydrologic cycle consists of the passage of water from the oceans ...

artesian well

(Encyclopedia)artesian well, deep drilled well through which water is forced upward under pressure. The water in an artesian well flows from an aquifer, which is a layer of very porous rock or sediment, usually san...

Antirent War

(Encyclopedia)Antirent War, in U.S. history, tenant uprising in New York state. When Stephen Van Rensselaer, owner of Rensselaerswyck, died in 1839, his heirs attempted to collect unpaid rents. Tenants on the estat...

Moore, John Bassett

(Encyclopedia)Moore, John Bassett, 1860–1947, American authority on international law, b. Smyrna, Del. He was admitted to the Delaware bar in 1883. He was (1885–86) a law clerk in the Dept. of State and was (18...

New Netherland

(Encyclopedia)New Netherland, territory included in a commercial grant by the government of Holland to the Dutch West India Company in 1621. Colonists were settled along the Hudson River region; in 1624 the first p...

Mason-Dixon Line

(Encyclopedia)Mason-Dixon Line, boundary between Pennsylvania and Maryland (running between lat. 39°43′26.3″N and lat. 39°43′17.6″N), surveyed by the English team of Charles Mason, a mathematician and ast...

Sully, Thomas

(Encyclopedia)Sully, Thomas, 1783–1872, American painter, b. England. Having come to the United States as a child, he first studied with his brother Lawrence, a miniaturist, and later for a brief time with Gilber...

Pyle, Howard

(Encyclopedia)Pyle, Howard, 1853–1911, American illustrator and writer, b. Wilmington, Del., studied at the Art Students League, New York City. His illustrations appeared regularly in Harper's Weekly, and in many...

ring, in astronomy

(Encyclopedia)ring, in astronomy, relatively thin band of rocks and dust and ice particles that orbit around a planet in the planet's equatorial plane. All four of the giant planets in the solar system—Jupiter, S...