As I explained in the Introduction above, Leavis's Richmond lecture was published in more than one form. It initially appeared in the Spectator, 9 March 1962, pages 297 to 303. The main title was given as ‘The significance of C. P. Snow’, with a smaller heading ‘The Two Cultures?’. The following week the Spectator published a letter from Leavis (page 335) providing several corrections to the text as printed (though he did not refer to the heading given to the article). In October of that year the lecture was published as Two Cultures? The Significance of C. P. Snow, ‘Being the Richmond Lecture, 1962. With an essay on Sir Charles Snow's Rede Lecture, by Michael Yudkin’ (London: Chatto & Windus, 1962). In 1963 it was published in the USA by Pantheon Books, New York, ‘with a new preface for the American reader’. It was then reprinted under the title ‘Two Cultures? The Significance of Lord Snow’, in F. R. Leavis, Nor Shall My Sword: Discourses on Pluralism, Compassion and Social Hope (London: Chatto & Windus, 1972).

‘Luddites? Or, there is only one culture’ was delivered as a lecture in the USA in 1966 and then published in F. R. and Q. D. Leavis, Lectures in America (London: Chatto & Windus, 1969). It was reprinted in Nor Shall My Sword in 1972.