Contains correspondence with a variety of organisations, including: the 16th International Congress of Zoology (August 1963); the Edinburgh Humanist Group; the 12th International Congress of Entomology (1964); the CIBA Foundation Symposium on The Biological Future of Man (November 1962); the Royal Physical Society of Edinburgh; the British Institute of Radiology; the British Biophysical Society Symposium (January 1965); 'Foods, Fads and Energy' lecture series for students of the Architectural Association School in London (March 1975); the Third International Conference of the Unity of the Sciences, London (21-24 November 1974).