Alexander Von HUMBOLDT (September 14; 1769 - May 6; 1859);naturalist;explorer;German geographer and botanist. Allegorical portrait at work during exploratory expeditions;while he puts botanical samples to dry between the pages of a herbarium;surrounded by scientific equipment. The concept of interconnection between natural systems is due to the eclecticism and the enormous amount of his studies;basis of environmentalism and ecological thinking. Colored etching from a painting by Friedrich Georg Weitsch of 1806