My duties as Tarner Lecturer and as Lecturer in the Moral Sciences at Trinity College, Cambridge, began together and overlapped during the Michaelmas term of 1923. It was therefore impossible for me to devote as much time to the preparation of the Tarner Lectures as I could have wished; and I was profoundly dissatisfied with them. So I determined to spend the whole of the Long Vacation of 1924, and all my spare time in the Michaelmas term of that year, in rewriting what I had written, and in adding to it. However bad the book may seem to the reader, I can assure him that the lectures were far worse; and however long the lectures may have seemed to the audience, I can assure them that the book is far longer.

C. D. Broad, The Mind and its Place in Nature, London, 1925, p. vii