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Bridges, Robert Seymour

(Encyclopedia)Bridges, Robert Seymour, 1844–1930, English poet. In 1882 he abandoned medical practice to devote himself to writing. An excellent metrist, he wrote many beautiful lyrics and longer poems, noted for...

Mead, Margaret

(Encyclopedia)Mead, Margaret, 1901–78, American anthropologist, b. Philadelphia, grad. Barnard, 1923, Ph.D. Columbia, 1929. In 1926 she became assistant curator, in 1942 associate curator, and from 1964 to 1969 s...

extinction

(Encyclopedia)extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of the affected speci...

Bellah, Robert Neelly

(Encyclopedia)Bellah, Robert Neelly bĕlˈə [key],1927–2013, American sociologist and educator. He was educated at Harvard (Ph.D., 1955) and taught there before becoming Elliot professor of sociology at the Univ...

de Vries, Hugo

(Encyclopedia)de Vries, Hugo hüˈgō də vrēs [key], 1848–1935, Dutch botanist. He opened a new approach to the study of evolution by using the experimental method to investigate the processes of evolution. His...

Ramapithecus

(Encyclopedia)Ramapithecus räməpəthēˈkəs, –pĭthˈə– [key], former name for an extinct group of primates that lived from about 12 to 14 million years ago, for a time regarded as a possible ancestor of Au...

sociobiology

(Encyclopedia)sociobiology, controversial field that studies how natural selection, previously used only to explain the evolution of physical characteristics, shapes behavior in animals and humans. The theory has c...

Swammerdam, Jan

(Encyclopedia)Swammerdam, Jan yän väˈmərdäm [key], 1637–80, Dutch naturalist. He was a pioneer in the use of the microscope. Before he turned to religious contemplation his chief interest was the study of in...

dentition

(Encyclopedia)dentition, kind, number, and arrangement of the teeth of humans and other animals. During the course of evolution, teeth were derived from bony body scales similar to the placoid scales on the skin of...

Adams, Robert McCormick, Jr.

(Encyclopedia)Adams, Robert McCormick, Jr., 1926–, American anthropologist, b. Chicago, Ill., grad. Univ. of Chicago (Ph.B., 1947; M.A., 1952; Ph.D., 1956). He served on the faculty of the Univ. of Chicago (1955�...