 Agassiz delivered an address to the Boston Society of Natural History in 1869, on the centenary of his patron's birth.When Humboldt was an elderly man, he aided another young scholar, Gotthold Eisenstein, a brilliant, young, Jewish mathematician in Berlin, for whom he obtained a small crown pension and whom he nominated for the Academy of Science.Humboldt's popular writings inspired many scientists and naturalists, including Charles Darwin, Henry David Thoreau, John Muir, George Perkins Marsh, Ernst Haeckel,, Ida Laura Pfeiffer as well as brothers Richard and Robert Schomburgk.