The papers of Sir Julian Sorell Huxley (1887-1975), grandson of evolutionist Thomas Henry Huxley (APS 1869), elder brother of novelist Aldous Huxley, and half-brother to Nobel-prize laureate Andrew Fielding Huxley (APS 1975) contain correspondence with Nobel laureate Hermann J. Muller and other early leaders in the field of evolutionary biology: Arthur James Cain, Hampton Carson, Ernst Mayr, Albert Blakeslee, Conrad Hal Waddington, and Philip MacDonald Sheppard. Also included in the collection are notebooks of Julian Huxley's often elaborate sketches of animals and fossils.