Louis Agassiz (1807-1873), Swiss-US geologist. Agassiz was born in Switzerland. He produced a catalogue of fossil fish from Brazil in 1829, and completed an extensive history of European fish in 1842. He wrote a pioneering five-volume work on fossil fish in 1843. He moved to the USA in 1846, and from his studies there on glaciers he proposed the idea of Ice Ages where ice sheets had advanced and retreated over Europe and North America. He was also a leading critic of Darwin's evolution theories. This artwork (of a photograph) is from volume II (1873) of 'Portrait Gallery of Eminent Men and Women in Europe and America'.