Joseph Dalton Hooker
Hooker acted as president of the British Association at its Norwich meeting of 1868, when his address was remarkable for its championship of Darwinian theories. Hooker was a close friend of Thomas Henry Huxley, a member of the X-Club (which dominated the Royal Society in the 1870s and early 1880s), and the first of the three X-Clubbers in succession to become President of the Royal Society.