Some new Turing letters from the time of his trial

I have turned up some physically slight but remarkable new material offering a further insight into Turing’s state of mind around the time of his trial for gross indecency. They don’t revolutionise the historical understanding, which remains largely as it was when Andrew Hodges first documented the available witness evidence back in the 1980s. But these letters do deepen that understanding and I found it particularly poignant to read Turing’s first-hands words afresh.

The typed fragment was prepared by Turing (the typewriting is distinctive!) in advance of his appearance at Knutsford Crown Court on 31 March 1952 at which he had decided to plead guilty, and updated soon after to let his friend and mentor Philip Hall known about the sentence. It clears up one point, which is that the idea of putting Turing under a psychiatrist was explicitly to administer oestrogen therapy, and not a post-verdict decision by that psychiatrist. But the question of why Turing pled guilty is a larger historical point of some importance to Turing iconography. The policeman that interviewed him prior to his arrest remembered that he had admitted his guilt: we know that because Andrew Hodges tracked the policeman down to Anglesey in the 1970s and interviewed him. Even a quarter-century after the event, the officer had a clear recollection of an unusual man; it is from the same interview that the detail about Turing playing the violin (probably rather badly, as he was self-taught) to his police visitors emerges.

This admission, when Turing could have kept silent, has puzzled many people over the years. Andrew’s biography interpreted it as a clarity about the difference between moral guilt and legal guilt and a principled refusal to accept the former; I used to have more scepticism, imagining Turing as an naive innocent abroad. I also used to think it was unlikely there’d ever be more evidence one way or the other. I was wrong on both counts.

First, thanks to Dermot Turing’s efforts, there was the remarkable unredaction of the Alexander letter I wrote about last year. And secondly, thanks to the professionalism of the Cambridge University Library, a letter emerged which can also plausibly, if not definitively, support a view of Turing’s stance as one of moral clarity.

The letter makes clear for the first time that there was independent evidence from Arnold Murray’s burglar friend that the police could use to support a charge of gross indecency. If a solicitor had been present before Turing was first interviewed, they would surely have advised that this was just hearsay from a deeply discreditable witness and told Turing to go no comment. But there was no such solicitor present, and Turing’s reference to ‘playing my hand very badly’ likely refers to this. As to what the letter says about Turing’s political and moral clarity, I’ll leave for now to others. More details about the letter and a few notes below the transcript.

Dear Philip
Thank you very much for your sympathy, and also for giving so much thought to the problem of what I should do. I am to be charged before magistrates on Feb 27, but the trial will not be until March 31. I will send Adcock a letter on lines you suggest, and he can hot it out whenever he wants. I could plead not guilty before magistrates, and guilty at trial, bur as my statement would be read before magistrates anyway (I suppose) this procedure would seem quite ridiculous.
I am not at present in any need of cheering up. Almost a week ago or more I had a horrible period when I was afraid the police were going to invetigate my whole life and that others might be ivolved. Now I realise that this was all mere nightmare, and am in quite good spirits. No doubt the proceedings themselves will be very disagreeable and the wondering afterwards who knows and who should be told.
I think I was unlucky to have been caught. The Y.B. in question, whom I had ‘picked up’ in Manchester, seems to have been a real bad lot. He stole a lot of my money almost under my nose, and was friendly with a man who later broke into my house & stole about £50 worth of stuff. The housebreaker, when apprehended, gave us away. A pretty story!
I’ve probably played my hand very badly over it all, but really I feel in a way quite content that given that the police really knew about it, it should finssh up this way. As it is it seems likely that I shall be put on probation, possibly including psychiatric treatment, and possibly say 3 months sentence which I am quite prepared for. If I were trying for a verdict of ‘not guilty’ I mght have got a longer sentence, and, even if I were acquitted nobody would be deceived. I certainly didn’t want anyone to be able to say ‘I assume the dear boy could never have done anything so horrid’.
I am told that the police often don’t prosecute in these cases. The reason why they are so doing in this case seems to be that they cannot ignore information laid by my burglar. It would cause bad feeling in the underworld. I certainly see that if you are to have a law of this sort it ought sometimes to be enforced. I suppose it might just as well be me as anybody else. My impression is that the University are not going to sack me, so I’ve rather little to worry about. 
Yours ever
Alan
There is no question of dividend.

The Hall papers were donated to the Library by Jim Roseblade in 2012 and permanently transferred there in 2019, when a terse catalogue entry was published. I’m grateful to Katrina Dean, the Keeper of Archives and Modern Manuscripts, for listening to my request to prioritise the subsequent detailed work, and to the archivist Susan Gordon who is currently carrying it out and has been very helpful in keeping me updated on her progress. I wrote about some rather uninteresting earlier finds from the same material here.

This letter was not the first time Hall knew of Turing’s sexuality. Hall had only been made a Fellow of King’s a couple of years before Turing arrived as an undergraduate and stayed there his whole life apart from working at Bletchley Park. Its clear from this and other letters that the older man acted both as a formal teacher of mathematics, and later as a professional mentor and, most clearly here, advisor on being outed. Hall was once described to me as ‘obviously homosexual…but nobody ever discussed it’, and while he would for decades invite young King’s mathematics students for dinner and a theatre date in ways that might be read as longing-from-afar, there’s no evidence at all of any sexual approaches, wanted or unwanted. When Turing raised the spectre of the police investigating ‘others who had been involved’, those ‘others’ were Cambridge figures, and perhaps Bletchley Park ones, not the working class objects of his own attractions. While it’s unlikely that Turing or Hall had themselves been ‘involved’, those words could have carried real fear into the heart of King’s; rather notably it must have been Hall who tore out the name ‘Turing’ from the pre-typed report of the verdict.

The reference to ‘dividend’ refers to the £300 per year that Fellows of King’s received, independently of any teaching work; the reason that there was no question of it was that Turing’s Fellowship had recently elapsed. By tradition, an ex-Fellow was still able to enjoy the hospitality of the college, able to eat at High Table and so on, and there was a more sensitive issue about whether Turing would continue to be welcome to this. Adcock was vice-Provost and responsible for this hospitality; he too was an old Bletchley Park hand. It’s not clear what the reference to ‘he can hot it out’ refers to, but most likely to any objections within the College to the reappeearance of a sex offender. Nor do we have any record of what, if anything, Adcock replied.

Letter from Alan Turing to Philip Hall, Cambridge University Library Hall Papers Add Ms.10311. Copyright by King’s College Cambridge and used by permission.


How to Hail Hall

A previously unseen and very slightly interesting letter from Turing to Philip Hall, his teacher, friend and colleague at King’s and Bletchley Park. It was written during the couple of years when Turing had departed Bletchley Park to work on the Delilah speech encryption project Delilah. (It’s my theory that it was the analyses of the nonlinear instabilities of those Delilah electronic circuits that inspired Turing’s mechanism for the model that became The Chemical Basis of Morphogenesis). One point of interest for some might be the group theory problem Turing raises. It is almost certainly the problem Hodges mentions in note 5.14 of ATTE and corresponds to the manuscript On Permutation Groups.

For me, more interesting is the social context in which Turing addresses his old friend as ‘Philip’. Turing’s first letter to Hall, announcing his first paper just a year after graduating, is topped and tailed ‘Dear Mr Hall’ and ‘A.M. Turing’, the near universal convention between student and don. A year later the address has become ‘Dear Hall’, the near universal convention between don and don. For example, Turing also carried on a long correspondence with Albert Ingham, who had been his other teacher at King’s, which always remained as ‘Turing’ and Ingham’ (see this example). But with Philip Hall, Turing progressed to the much more intimate ‘Philip’ by about 1937 and that’s where it stayed. I had already seen these gradations of emotional intimacy from the Hall letters in the King’s archive and their absence in the Ingham archive in Trinity but it is interesting to see them confirmed here.

The lectureship is slightly mysterious. Max Newman’s obituary says Turing was offered one in 1945, and his mother thought so so. Hodges, correctly I think, dismisses the fact there was ever a formal offer as he found no record in the Faculty Board minutes. Most likely Turing did apply for the lectureship and didn’t get it (again). One wonders if that contributed to his decision to go to NPL rather than straight back to King’s. His thought of using Hall and Newman as referees make sense as two people in Cambridge who understood his work well, but it was surely naive to think of Maurice Pryce, then a very junior lecturer whose word would not have counted for much. And interesting who he didn’t consider naming as supportive, most especially Albert Ingham.

The other thing I note is the reference to ‘Bletchley Park’ as ‘the firm’. I know that later became how MI6 and the CIA referrred to itself and, apparently, the British Royal Family too (I wonder which came first), and to me it evokes organised football hooligans more than anything else. But I wasn’t aware of this usage for GCHQ before, with its implications not just of the dividends of loyalty but also of punishment for disloyalty.

Turing to Hall, around 1945. Cambridge University Library (thanks!) Hall Papers MS Add 10311 Box 14. Copyright King’s College Cambridge.

Here’s the text of the letter:

Hanslope Park

Hanslope

Bucks

Dear Philip, I see there is a vacant lectureship (or rather 3 of them) I am sending my name in. May I quote you as a referee? I am thinking of mentioning Newman, Pryce, and you.

Recently I have been playing with a possible application of group theory with some application to the work of the firm viz 'What are the permutation groups on N symbols which contain an N-cycle R? I investigated it as far as N=8 , and found that most such groups are either a) intransitive or injunctive b) consisting of elements commuting with a power of R , c) the normalizer of R , but in case N=7 and N=8 these were groups associated with 7-point geometry which came in.

Yours

Alan Turing

Morphogenesis on trial

It’s well known (thanks as usual to Andrew Hodges) that Alan Turing did not shy from public view whilst awaiting trial as a sex offender. The day after his arrest, Turing went to London for the February 1952 meeting of the Ratio Club; the day the newspapers reported the first hearing he debated with the high profile chemist Prigogine on a visit to Manchester. What I hadn’t known until now was that in the very week after Turing was found guilty and sentenced, he had arranged to give a talk at the Manchester meeting of the Society for Experimental Biology.

Society for Experimental Biology Manchester meeting programme, 1952, thanks to the SEB archivists for locating and providing this.

I don’t know if Turing turned up to give his talk: given his track record and the enormous importance of the morphogenesis work to him he probably did. What he talked about was almost certainly the paper he had submitted the previous November to Proceedings of the Royal Society. Nobody seems to have remembered the talk particularly: the one developmental biologist who was most enthused by Turing was Claude Wardlaw who already knew of the work (and likely had a hand in getting Turing on the programme). In hindsight, the Snow’s experimental program fitted very well with Turing’s theoretical one but there is no record of any personal connection ever being established. The chair, Joseph Woodger, was a remnant of an earlier and largely failed attempt at theoretical biology. It is very unlikely that Turing would have failed to read Woodger’s 1937 The Axiomatic Method in Biology (1937). Woodger’s book was a forlorn attempt to transfer the Russell-Whitehead logical calculus of Principia Mathematica to a finite list of biological facts (in practice just Mendelian genetics, though not even that is fully worked out), and Turing would have surely have understood that this process jettisoned all the interesting phenomena and paradoxes of infinite logical systems. Unusually for a trained logician, Turing was also demonstrating himself as a skilled applied mathematical modeller: he could not have failed to see that Woodger was not. So I rather doubt Turing found much of interest in him. On the other hand, at about this time Turing made a lifelong friend in Joseph Woodger’s son Michael.

Mathematical Phyllotaxis

My new book on the mathematics of Fibonacci numbers in plants is out this summer from Springer.

Though my own path to writing this book came from trying to make sense of Turing’s ideas, it’s not a guide to his morphogenesis work. Instead it’s a contemporary mathematics textbook suitable for a higher undergraduate or graduate course, though remarkably Turing’s ideas do still play a part in the modern theory. And while we’re here a further advert for an ArXiV preprint developing some of the ideas in the book and a Github repository with support code used to generate the figures.