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Lahontan, Lake

(Encyclopedia)Lahontan, Lake ləhŏnˈtən [key], extinct lake of W Nev. and NE Calif. It was formed by heavy precipitation caused by the Pleistocene glaciers and with Lake Bonneville (see under Bonneville Salt Fla...

Osborn, Henry Fairfield

(Encyclopedia)Osborn, Henry Fairfield, 1857–1935, American paleontologist and geologist, b. Fairfield, Conn. He was professor of comparative anatomy (1883–90) at Princeton, and professor of biology (1891–96) ...

Oreopithecus

(Encyclopedia)Oreopithecus ôrˌēōpĭthˈəkəs, –pĭthēˈkəs [key], extinct genus of apes whose fossils have been found in E Africa and Italy. It is best known through specimens preserved in coal deposits. I...

Brongniart, Adolphe Théodore

(Encyclopedia)Brongniart, Adolphe Théodore ädôlfˈ tāōdôrˈ brôNyärˈ [key], 1801–76, French botanist; son of Alexandre Brongniart. He was a pioneer in the study of plant morphology and physiology and was...

Rhyniophyta

(Encyclopedia)Rhyniophyta rīˌnēŏfˈətə [key], division of plants known only from fossils, of which the genus Rhynia was perhaps the most important. These plants date from the Silurian and Devonian age. Relati...

Shiwalik Hills

(Encyclopedia)Shiwalik Hills sĭwäˈlĭk [key], southernmost range of the Himalayas, S central Asia, extending c.1,050 mi (1,690 km) from SW Kashmir through N India into S Nepal paralleling the main Himalayan rang...

anticoagulant

(Encyclopedia)anticoagulant ănˌtēkōăgˈyələnt [key], any of several substances that inhibit blood clot formation (see blood clotting). Some anticoagulants, such as the coumarin derivatives bishydroxycoumarin...

Dawkins, Sir William Boyd

(Encyclopedia)Dawkins, Sir William Boyd, 1837–1929, English geologist and archaeologist. He was a member (1861–69) of the Geological Survey of Great Britain, curator (1870–90) of the Manchester Museum, and pr...

Scudder, Samuel Hubbard

(Encyclopedia)Scudder, Samuel Hubbard, 1837–1911, American entomologist, b. Boston, grad. Williams (B.A., 1857) and Harvard (B.S., 1862). The founder of American insect paleontology and an authority on Orthoptera...

American Association for the Advancement of Science

(Encyclopedia)American Association for the Advancement of Science (AAAS), private organization devoted to furthering the work of scientists and improving the effectiveness of science in the promotion of human welfa...