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
his brother, Baron (Karl) Wilhelm von (ˈvɪlhɛlm fɔn). 1767–1835, German philologist and educational reformer
[hŭm′bōlt′, hum′bôlt′]Baron(Friedrich Heinrich) Alexander von1769-1859
German naturalist and writer who explored South America, Cuba, and Mexico (1799-1804) and recorded a wide range of species, particularly plants, and attempted to explain their geographic distribution with respect to their environment. His work laid the foundation the science of ecology.