9 letters, 13 pages, typed, February-July 1953.
February 7th 1953 Hayek to Harrod from Chicago, "Wittgenstein was a relation of mine...when I got the impression that nobody else seemed to prepare a biographical sketch I began to collect a little material and got so fascinated that I went on with it.... One of the possible sources of information are of course the Keynes papers...I should of course be specifically interested if there existed any letters to L.W. to J.M.K..."
February 17th 1953 Harrod to Hayek, "Long ago, namely in the 'twenties', I talked a good deal to Keynes about Wittgenstein; I talked still more to Frank Ramsey.... He was a devoted admirer of Wittgenstein's, and himself a philosopher of some brilliance.... I feel that you will have the most extreme difficulty in screwing any information out of anyone else.... He was extremely secretive and periodically went into complete retreat. He spent the last period of his life in Oxford..... He was reluctant to publish. Copies of his notes were handed round a very select circle of people. It was a great privilege to see them. There was the pink book and the blue book and mumbo-jumbo of that sort.... I think Keynes was the one person who was able to influence his conduct. He stopped him from going to settle in Russia during the 'thirties'...."
February 1953 Hayek to Harrod from Chicago, "I am planning no more than a perhaps longish factual article, probably for MIND.... I am more intrigued by W than I admire him: I have no doubt that he at times was close to the border of actual madness-he believed so himself, and I that he combined a good deal of the crank with some real genius...."
April 23rd 1953 Hayek to Harrod from Chicago.
July 1st 1953 Hayek to Harrod from Chicago, "Among some Wittgenstein material which I have traced in Vienna I have also found two letters by Keynes..." attached is a typed copy of beginning of draft of a letter by Wittgenstein to Keynes of 1924.
July 8th 1953 Harrod to Munby of King's College, Cambridge enquiring about any Wittgenstein letters in the Keynes papers.
July 8th 1953 Harrod to Lady Adrian, about Wittgenstein and Hayek's research.
July 10th 1953 Munby to Harrod, from King's College Library "there are no letters from Wittgenstein" and enclosing a list of the names of the correspondents with Keynes in King's College Library.
July 15th Harrod to Hayek on the result of the search for Wittgenstein letters at King's.
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November 4th 1932, 2 pages in ink from London School'of Economics, with envelope.
"...I think I am quite prepared to concede the substance of your point...the 'range of neutral inventions' referred to the extension of Pigou's definition, not to Pigou's definition itself.
"But I freely admit that I had not thought out the implications of Pigou's definitions thoroughly, and here your letter has been very helpful. I can see now that this discussion would have been much improved if I had allowed for the consequential shift in social demand curves which must follow the invention-just as I did allow forthe consequential changes in supply of the factors of production. I neglected these consequences rather over-hurriedly, because I had satisfied myself that 'autonomous' changes in demand were very similar in their effects to inventions. But the result is that these pages (122-3) are inadequate....
"It is very nice of you to express yourself as you do about my book...."
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