Aurichalcite

A mineral composed of the hydroxide carbonate of zinc and copper (Zn, Cu)5(OH)6(CO3)2. It is commonly found with malachite in the oxidized zone of zinc and copper deposits as at Tomsk, Siberia; Santander, Spain; and Bisbee, Ariz., U.S. Its pale blue-green featherlike form distinguishes it from malachite; and, because it is a weathered product of zinc-rich ores, it can serve as a guide to

Hadrumetum

Modern  Susah , also spelled  Sousa,  or  Sousse  ancient Phoenician colony some 100 miles (160 km) south of Carthage, on the east coast of the Al-Hammamat Gulf in what is now Tunisia. Hadrumetum was one of the most important communities within the Carthaginian territory in northern Africa because of its location on the sea at the edge of the fertile Sahel region. In the Third Punic War (149–146 BC) Hadrumetum sided with Rome, and its citizens

Ford, Edmund Brisco

Ford joined the faculty at the University of Oxford in 1927; he was made professor of ecological genetics in 1963, becoming emeritus professor in 1969. He

Bialik, Haim Nahman

Born into poverty, Bialik was left fatherless when he was five or six years old and was brought up by his rigidly pious, learned

Thenard, Louis-jacques

A peasant's son, Thenard endured extreme hardships to gain his scientific education. His several teaching posts were obtained through the influence of Nicolas-Louis Vauquelin, who also arranged Thenard's succession to his

Extremum

Plural  Extrema,  in calculus, any point at which the value of a function is largest (a maximum) or smallest (a minimum). There are both absolute and relative (or local) maxima and minima. At a relative maximum the value of the function is larger than its value at immediately adjacent points, while at an absolute maximum the value of the function is larger than its value at any other point in

Epistemology, Knowledge by acquaintance and knowledge by description

The distinction between knowledge by acquaintance and knowledge by description was introduced by Bertrand Russell in connection with his celebrated theory of descriptions. Here only the epistemological (as distinct from the logical) version of his theory will be considered. It was invented by Russell to lend support to the basic thesis of empiricism that all

Saarinen, (gottlieb) Eliel

He became the foremost architect of his generation in Finland before he moved to the U.S. in 1923. By 1914 he was widely known in Europe

Antarctica, Geologic record

Raymond J. Adie (ed.), Antarctic Geology (1964), and Antarctic Geology and Geophysics (1972); Campbell Craddock (ed.), Antarctic Geoscience (1982); R.L. Oliver, P.R. James, and J.B. Jago (eds.), Antarctic Earth Science (1983); and M.R.A. Thomson, J.A. Crame, and J.W. Thomson (eds.), Geological Evolution of Antarctica (1991), are records of international symposia describing Earth science research by many nations. J.C. Behrendt and C.R. Bentley, Magnetic and Gravity Maps of the Antarctic (1968); and Campbell Craddock et al., Geologic Maps of Antarctica (1969–70), provide maps and texts, the latter work covering most mountain regions at a 1:1,000,000 scale. Other works on the geology of Antarctica are Edmund Stump (ed.), Geological Investigations in Northern Victoria Land (1986); and W.E. LeMasurier and J.W. Thomson (eds.), Volcanoes of the Antarctic Plate and Southern Oceans (1990). Scripps Institution of Oceanography, Initial Reports of the Deep Sea Drilling Project, vol. 28 (1975), 35 (1976), and 36 (1977), contain results of drilling by the Glomar Challenger in Antarctic waters. Results of drilling by the JOIDES Resolution are contained in Proceedings of the Ocean Drilling Program: Scientific Results, especially vol. 113 (1990), from the Weddell Sea, vol. 114 (1991), from subantarctic regions and the Falkland Islands, and vol. 119 (1991), from the Kerguelen Plateau. A.L. Graham and John O. Annexstad, “Antarctic Meteorites,” Antarctic Science, 1(1):3–14 (1989), reviews the findings and origins of meteorites in Antarctica. Many details of Antarctic meteorite investigations are also reported in volumes of the Proceedings of the NIPR Symposium on Antarctic Meteorites (annual), published by the National Institute of Polar Research.

Chemical Banking Corporation

The holding company's principal subsidiary was Chemical Bank, which was chartered in 1824 in New York City as a division of the New York Chemical Manufacturing Company. Manufacturing activities were dropped in 1832. In 1844 the company was reconstituted as a state bank, and the chemical