Correspondence, diaries and other papers of Sir Alfred Charles Glyn Egerton, including some personal papers but largely relating to The Royal Society and particularly to wartime activities and post-war research needs in Britain. The diaries form an almost complete record of Egerton's career during the period 1943-1959. Earlier diaries date back to 1917 and the period 1929-1930, but for the most part they relate to the period 1938-1941.

A small collection of papers of Sir Arthur George Tansley, mainly related to the formation of organisations, in the period 1918-1921, that aimed to promote pure and applied scientific research. The bulk of the collection consists of papers relating to Tansley's involvement in the Scientific Research Association. The Scientific Research Association's papers include rules, promotional leaflets and circulars, financial material and a relatively large amount of correspondence. A smaller amount of material survives for the National Union of Scientific Workers including rule booklets, membership lists, reports from meetings, agenda and promotional leaflets and circulars. Only a few items are preserved in this collection for the Federation of Technical and Scientific Associations and the Cambridge Research Group. The published articles and reports at AT/5 mainly concern issues related to the funding, support and the general state of scientific research. As a whole the collection reveals many problems faced by those who wished to organise research work after the first world war, such as the problem of rival organisations created to promote research whose aims overlapped, and disagreements over how and whether research could be organised. For example a letter from the Royal Society to the Scientific Research Association commented that 'lines of development' were 'discovered not by councils or committees but by the instinct of individuals, and the less this is trammelled by organization the better' (AT/2/6/1/42). The article 'Research and Organisation' at AT/2/3/15 was written in an attempt to answer such criticisms by arguing that research could be organised. Other issues also surface in the correspondence of the Scientific Research Association. For example one letter opposed support for any scheme founded on government funding as 'government endowment will, in the long run, corrupt Science...' (AT/2/6/2/17). There were also disagreements as to whether emphasis should be laid upon 'the promotion of scientific research' or 'the economic interest' of research workers which seems to have contributed to a division between the National Union of Scientific Workers and the Scientific Research Association (AT/2/4/3).