Contains chiefly correspondence between Sang and individuals within the Agricultural Research Council (ARC); namely the chairman, Lord Victor Rothschild, the secretary, Sir William K. Slater and a senior official, W.G Alexander. Also contains correspondence with colleagues at the genetics section of the Animal Breeding and Genetics Research Organisation, chiefly Cecil Gordon and C.H Waddington as well as the Principal of the University of Edinburgh, Edward Appleton. The papers chiefly concern Sang's details of various grievances within the Organisation and his unhappiness with the conducting of the enquiry and its aftermath.
There are also substantial numbers of Sang's drafts of letters (some marked 'Not Sent'), memoranda and notes. Also present are several copies of Sang's 'Memorandum on the affairs of the Genetics Laboratory of the Animal Breeding and Genetics Research Organisation during the period July 1948 to September 1950'. Later correspondence between Sang and the ARC concerns accommodation and equipment issues in the Poultry Research Centre, and arrangements with Sang's students and colleagues.