In the words of American essayist Ralph Waldo Emerson, “Humboldt was one of those wonders... who appear from time to time, as if to show us the possibilities of the human mind, the force and the range of the faculties. ”
ونقلا عن لسان كاتب المقالات الاميركي رالف والدو أمرسون ،‏ « كان همبولت نابغة من النوابغ .‏ .‏ .‏