The correspondence with the publishers shows the care expended on what was clearly recognised as a major and highly-valued undertaking. Includes memorandum by director to chairman (Stanley Unwin) about the book, in which he compares it to Darwin's Origin of Species and Toynbee's Study of History, describes it as 'the most important thing of its sort which has come our way since Bertrand Russell's History of Western Philosophy', and also draws attention to Darlington's methods of composition and multiple re-drafting as 'a palimpsest of successive revisions on white, pink, yellow and finally green paper'. Folder also includes draft 'blurb', and preparations for American edition.