International Humanist and Ethical Union, International Institute of Differing Civilizations, International Institute of Political and Social Sciences, International Planned Parenthood Federation, 1962; 1959; 1949, 1951; 1957-66

While Series I: General Correspondence contains substantive and personal communications between Sir Julian and members of specific organizations, this series includes membership rosters, reports and newsletters, speeches, minutes and memoranda, organizational publications, notes, press releases and clippings. The organizations represented here reflect Huxley's varied interest in biology, humanism, eugenics and population control and conservation. Occasionally files overlap: the founding of the World Wildlife Fund is documented in the "Nature Conservancy" and "World Wildlife Fund" files; the Galapagos Island expedition is recorded in the Royal Society's Pacific Expedition Committee minutes and in the "Charles Darwin Foundation for the Galapagos Islands" file. Most items fall in the 1940-1966 period.

Some organizations, such as the Royal Society and Eugenics Society, have fairly complete runs of material over a period of years; most, however, such as the Naples Zoological Station, are represented by only a few documents, or, as in the case of Unesco, several unrelated items spanning many years of sporadic collecting. Two files with perhaps the most original and complete materials are those concerning the Unesco "History of the Social and Cultural Development of Mankind" for the years 1948-1966 and a discussion group active in the 1950s, the "Idea Systems Group." Organizations which solicited Sir Julian's support also have material in this series - such as the Religious Society of Families, a eugenically-based community in the United States.

Government publications and publications sponsored by an organization but authored by individuals are in the MANUSCRIPTS, PUBLICATIONS AND ADDRESSES BY OTHERS series. See also CONFERENCE MATERIALS for organizational material on specific events.