Baron (Friedrich Heinrich) Alexander von (alɛˈksandər fɔn). 1769–1859, German scientist, who made important scientific explorations in Central and South America (1799–1804). In Kosmos (1845–62), he provided a comprehensive description of the physical universe
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his brother, Baron (Karl) Wilhelm von (ˈvɪlhɛlm fɔn). 1767–1835, German philologist and educational reformer