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rickettsia

(Encyclopedia)rickettsia rĭkĕtˈsēə [key], any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods s...

Van Buren, Martin

(Encyclopedia)Van Buren, Martin, 1782–1862, 8th President of the United States (1837–41), b. Kinderhook, Columbia co., N.Y. He was again the presidential candidate of the Democratic party in 1840, but he was ...

analytic geometry

(Encyclopedia)analytic geometry, branch of geometry in which points are represented with respect to a coordinate system, such as Cartesian coordinates, and in which the approach to geometric problems is primarily a...

continental drift

(Encyclopedia)CE5 Continental drift (arrows indicate the directions of motion of the landmasses) A. Proposed reconstruction of the supercontinent Pangaea indicating the major present landmasses B. Proposed recon...

chemical industry

(Encyclopedia)chemical industry, the business of using chemical reactions to turn raw materials, such as coal, oil, and salt, into a variety of products. During the 19th and 20th cent. technological advances in the...

Garfield, James Abram

(Encyclopedia)Garfield, James Abram, 1831–81, 20th President of the United States (Mar.–Sept., 1881). Born on a frontier farm in Cuyahoga co., Ohio, he spent his early years in poverty. As a youth he worked as ...

Disraeli, Benjamin, 1st earl of Beaconsfield

(Encyclopedia)Disraeli, Benjamin, 1st earl of Beaconsfield dĭzrāˈlē [key], 1804–81, British statesman and author. He is regarded as the founder of the modern Conservative party. Disraeli succeeded the earl ...

missions

(Encyclopedia)missions, term generally applied to organizations formed for the purpose of extending religious teaching, whether at home or abroad. It also indicates the stations or the fields where such teaching is...

Kepler's laws

(Encyclopedia)CE5 Schematic representation of Kepler's second law: The areas ABF and A′B′F′ are equal and are swept out in equal intervals of time by a planet orbiting around the sun (at F). Kepler's laws...

Parnell, Charles Stewart

(Encyclopedia)Parnell, Charles Stewart pärˈnəl, pärnĕlˈ [key], 1846–91, Irish nationalist leader. Haughty and sensitive, Parnell was only a mediocre orator, but he possessed a marked personal fascination an...