Ernst Haeckel

Lore & Background

Ernst Haeckel was born in Potsdam in 1834 and studied medicine in Berlin and Würzburg, working briefly as an assistant to Rudolf Virchow. He earned a doctorate in medicine in 1857 but found the occupation of physician less worthwhile after contact with suffering patients. He then studied under Carl Gegenbaur at the University of Jena, earning a habilitation in comparative anatomy in 1861 and becoming a professor of zoology there, a position he held for 47 years. Between 1859 and 1866 he worked on radiolarians, sponges, and segmented worms, naming nearly 700 new species of radiolarians during a Mediterranean trip. In 1866 he traveled to the Canary Islands, met Charles Lyell and Thomas Huxley in London, and visited Charles Darwin at Down House. He married Agnes Huschke in 1867; they had three children. He traveled to Norway, Croatia, Egypt, Turkey, and Greece for research. In 1907 he had a museum built in Jena to teach evolution, retired from teaching in 1909, and withdrew from the Evangelical Church of Prussia in 1910. His first wife, Anna Sethe, died in 1864; his second wife, Agnes, died in 1915. He sold his Villa Medusa in 1918 and died on 9 August 1919.

Reader's Guide

Ernst Haeckel's significance lies in his dual role as a popularizer of Darwinian evolution in Germany and as a prolific originator of biological terminology and concepts. He coined the terms ecology, phylum, phylogeny, ontogeny, and Protista, and his illustrated work Kunstformen der Natur influenced the Art Nouveau movement. However, his most famous contribution—the recapitulation theory, or 'Biogenetic Law'—is now considered disproven. Haeckel claimed that an individual's biological development (ontogeny) parallels its species' evolutionary history (phylogeny), using drawings of human embryos that have been criticized as oversimplified and possibly falsified; the debate over intent remains unresolved. He also promoted scientific racism and Social Darwinism, and his view of social sciences as 'applied biology' was later used for Nazi propaganda, though his books were banned by the Nazi Party. He was the first to characterize the Great War as the 'first' World War in 1914. His speculative concepts, such as hypothetical ancestral microorganisms, are now considered incorrect, and he rejected natural selection in favor of Lamarckism. Despite these errors, his work on radiolarians and comparative anatomy remains respected, and his concept of heterochrony continues to inform evolutionary developmental biology.

Did You Know?

• Haeckel coined the term 'ecology' and also introduced 'phylum,' 'phylogeny,' 'ontogeny,' and 'Protista.'
• He was the first person to characterize the Great War as the 'first' World War, as early as 1914.
• His book Kunstformen der Natur, with over 100 detailed illustrations, influenced the Art Nouveau artistic movement.
• Haeckel named nearly 700 new species of radiolarians during a trip to the Mediterranean.