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Engler, Adolf
(Encyclopedia)Engler, Adolf äˈdôlf ĕngˈlər [key], 1844–1930, German botanist. He emphasized the importance of geological history in the study of plant geography, and worked out an influential system of plan...china clay
(Encyclopedia)china clay, one of the purest of the clays, composed chiefly of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism. Usage of the terms china clay and kaolin is n...oils
(Encyclopedia)oils, term commonly used to indicate a variety of greasy, fluid substances that are, in general, viscous liquids at ordinary temperatures, less dense than water, insoluble in water but soluble in alco...National Republican party
(Encyclopedia)National Republican party, in U.S. history, a short-lived political party opposed to Andrew Jackson. In the election of 1828, which Jackson won overwhelmingly, some of the supporters of his opponent, ...Jussieu
(Encyclopedia)Jussieu zhüsyöˈ [key], French family of distinguished botanists. Antoine de Jussieu, 1686–1758, was director of the Jardin des Plantes, Paris. He edited Jacques Barrelier's posthumously published...Presidential Range
(Encyclopedia)Presidential Range, group of the White Mts., N N.H., so called from the names of its peaks. Mt. Washington (6,288 ft/1,917 m) is the highest peak in New Hampshire; a meteorological station is at the s...firing
(Encyclopedia)firing, process of treating clay or other plastic ceramic materials with heat to produce a hard, durable but brittle material such as pottery. Primitive potters baked their clay in an open fire, but f...flint clay
(Encyclopedia)flint clay: see fire clay.solid
(Encyclopedia)solid, one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from liquid and gas, in which a substance has both a definite shape and a definite volume....steel
(Encyclopedia)steel, alloy of iron, carbon, and small proportions of other elements. Iron contains impurities in the form of silicon, phosphorus, sulfur, and manganese; steelmaking involves the removal of these imp...Browse by Subject
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