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Wolff, Caspar Friedrich

(Encyclopedia)Wolff, Caspar Friedrich käsˈpär frēˈdrĭkh vôlf [key], 1733–94, German biologist, a founder of observational embryology. In his Theoria generationis (1759) he reintroduced the theory of epigen...

Haldane, John Scott

(Encyclopedia)Haldane, John Scott, 1860–1936, British scientist, b. Edinburgh; father of John Burdon Sanderson Haldane. He made many important contributions to mine safety, investigating principally the action of...

Hall, Marshall

(Encyclopedia)Hall, Marshall, 1790–1857, English physician and physiologist, M.D. Univ. of Edinburgh, 1812. He practiced medicine in Nottingham and in London. He opposed bloodletting and devised a method of artif...

Orlon

(Encyclopedia)Orlon, trademark for an acrylic fiber available in filaments (long single strands) or staples (bundles of short fibers). Orlon is resistant to sunlight and atmospheric gases, which makes it ideal for ...

intelligent design

(Encyclopedia)intelligent design, theory that some complex biological structures and other aspects of nature show evidence of having been designed by an intelligence. Such biological structures are said to have int...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

Kronecker, Leopold

(Encyclopedia)Kronecker, Leopold lāˈōpôlt krōˈnĕkˌər [key], 1823–91, German mathematician. After making a fortune in business he devoted his attention to mathematics and became professor at the Univ. of ...

Stahl, Georg Ernst

(Encyclopedia)Stahl, Georg Ernst gāˈôrkh ĕrnst shtäl [key], 1660–1734, German physician and chemist. He taught (1694–1716) at the Univ. of Halle, then went to Berlin as court physician. He is known for his...

symbolic logic

(Encyclopedia)symbolic logic or mathematical logic, formalized system of deductive logic, employing abstract symbols for the various aspects of natural language. Symbolic logic draws on the concepts and techniques ...

Hess, Harry Hammond

(Encyclopedia)Hess, Harry Hammond, 1906–69, American geologist and oceanographer, b. New York City, B.S., Yale, 1931, Ph.D., Princeton, 1932. He taught at Rutgers (1932–33) and was a research associate at the G...