Lesquereux, Léo, 1806-1889

Louis Agassiz (1807-1873, APS 1843) was a zoologist and geologist. A student of Georges Cuvier, Agassiz was renown for his six-volume work Poissons fossils, a study of more than 1,700 ancient fish. Equally important was his Ètudes sur les glaciers (1840). In 1845 Agassiz moved to the United States on a two-year study grant from King Friedrich Wilhelm IV of Prussia to compare the flora and fauna of the United States and Europe. While in the United States he was invited to deliver a course of lectures at the Lowell Institute in Boston. He took America and New England by storm and as a result in 1847 was appointed professor of zoology and geology at Harvard’s new Lawrence Scientific School.

Jean Louis Rodolphe Agassiz was born in Motier, Switzerland on May 26, 1807, the son of a Protestant minister Rodolphe Agassiz and his wife Rose Mayor. Despite family pressure to enter business, Agassiz early decided to devote himself to the study of nature. At the age of twenty-one he predicted that he would become “the first naturalist of his time, a good citizen and a good son.” His determination gained Agassiz an excellent education in the natural sciences at the Universities of Heidelberg and Munich. He also made important contacts in early life that formed his outlook and provided the basis for his early career. The naturalist Johann B. Spix allowed him to publish on a collection of fish from Brazil that Spix had gathered, while the anatomist Ignaz Döllinger trained him to use the microscope and introduced him to the field of embryology. Philosophically, Agassiz was influenced by the German idealism of Lorenz Okenfuss, who built a system of biological classification based upon increasing complexity of sense organs. Agassiz’s scientific thought and practice was characterized by two separate and often contradictory outlooks. One was exact and pragmatic; the other was transcendental. His approach was clearly influenced by French zoologist and paleontologist Georges Cuvier, who passed on to Agassiz his remarkable collection of fossil fish illustrations. He also impressed the geographer Alexander Humboldt, an adviser to the king of Prussia who arranged an appointment for him at the Collège de Neuchâtel in 1832, where he taught natural history for more than ten years. During these years (1832-42) he studied fossil fish in museums and private collections throughout Europe, resulting in his six-volume Poissons fossils that described more than 1,700 primeval fish, that he analyzed according to Cuvier’s comparative method. The work, which won high praise from major Bristish naturalists Sir Charles Lyell and Richard Owen, provided the basis for Agassiz’s scientific fame and fortune. His natural philosophy was infused with the belief in an all-powerful diety, who planned and created every single living being, plant and animal, undercutting any genetic connection between ancient and modern creatures.

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