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Siegen, Ludwig von

(Encyclopedia)Siegen, Ludwig von lo͝otˈvĭkh fən zēˈgən [key], c.1609–1680, German engraver, b. Holland, educated in Germany. He is said to have invented (c.1640) the mezzotint process of engraving. Among h...

saxifrage

(Encyclopedia)saxifrage săkˈsĭfrĭj [key], common name for several members of the Saxifragaceae, a family of widely varying herbs, shrubs, and small trees of cosmopolitan distribution. They are found especially ...

indicators, acid-base

(Encyclopedia)indicators, acid-base, organic compounds that, in aqueous solution, exhibit color changes indicative of the acidity or basicity of the solution. Common indicators include p-nitrophenol, which is color...

globeflower

(Encyclopedia)globeflower, common name for any plant of the genus Trollius of the family Ranunculaceae (buttercup family), hardy perennials of north temperate meadows and swamps. Their blossoms are larger than thos...

Eichler, August Wilhelm

(Encyclopedia)Eichler, August Wilhelm ouˈgo͝ost vĭlˈhĕlm īkhˈlər [key], 1839–87, German botanist. He worked out the symmetry of the parts of a flower and developed a system of plant classification which, ...

vascular bundle

(Encyclopedia)vascular bundle, in botany, a strand of conducting tissue extending lengthwise through the stems and roots of higher plants, including the ferns, fern allies, gymnosperms, and angiosperms. The vascula...

Hercules'-club

(Encyclopedia)Hercules'-club, common name for several small, thorny trees, chiefly the devil's-walking-stick of the family Aralaceae (ginseng family) and the prickly ash of the family Rutaceae (orange family). The ...

Sabine

(Encyclopedia)Sabine săbēnˈ [key], river, c.575 mi (925 km) long, rising on the prairies NE of Dallas, Tex. It flows SE across Texas, then south to mark the Texas–Louisiana line. Near its mouth it broadens to ...

Fort Nassau

(Encyclopedia)Fort Nassau. 1 Built (1614) on Castle Island, in the Hudson River, S of Albany, N.Y. The fort served as a trading post for the Dutch until 1617, when it was destroyed by flood and replaced (1624) by F...

biology

(Encyclopedia)biology, the science that deals with living things. It is broadly divided into zoology, the study of animal life, and botany, the study of plant life. Subdivisions of each of these sciences include cy...