Étienne Geoffroy Saint-Hilaire

French naturalist (1772–1844)

Étienne Geoffroy Saint-Hilaire (French pronunciation: [etjɛn ʒɔfʁwa sɛ̃t‿ilɛʁ]; 15 April 1772 – 19 June 1844) was a French naturalist who established the principle of "unity of composition". He was a colleague of Jean-Baptiste Lamarck and expanded and defended Lamarck's evolutionary theories. Geoffroy's scientific views had a transcendental flavor (unlike Lamarck's materialistic views) and were similar to those of German morphologists like Lorenz Oken.

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